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Update manpage
This commit is contained in:
Andrea Mazzoleni
parent
fb051e02c7
commit
8a727975ab
4 changed files with 167 additions and 70 deletions
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@ -651,11 +651,11 @@ Print the status of the array \-> \`status\`
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.IP \(bu
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Control the disks \-> \`smart\`, \`probe\`, \`up\`, \`down\`
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.IP \(bu
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Make a backup/snapshot \-> \`sync\`
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Make a backup/recovery point \-> \`sync\`
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.IP \(bu
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Periodically check data \-> \`scrub\`
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.IP \(bu
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Restore the last backup/snapshot \-> \`fix\`.
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Restore the last backup/recovery point \-> \`fix\`.
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.PD
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.PP
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Commands must be written in lowercase.
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@ -885,9 +885,9 @@ The files in the array are NOT modified.
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.SS fix
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Fixes all the files and the parity data.
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.PP
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All files and parity data are compared with the snapshot
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state saved in the last \`sync\`.
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If a difference is found, it is reverted to the stored snapshot.
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All files and parity data are compared with the state saved in
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the last \`sync\`.
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If a difference is found, it is reverted to the stored state.
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.PP
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WARNING! The \`fix\` command does not differentiate between errors and
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intentional modifications. It unconditionally reverts the file state
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@ -1428,20 +1428,31 @@ Note that such disks are not affected by the \`up\` and \`down\` commands
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because they are expected to be always spinning.
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.SS snapshot
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Enable the use of filesystem snapshots for the \`sync\`, \`scrub\`,
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\`check\`, and \`fix\` commands, provided the underlying filesystem
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supports it.
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\`check\`, and \`fix\` commands.
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.PP
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When enabled, SnapRAID creates a read\-only snapshot of your data at the
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start of a \'sync\'. This ensures a consistent, point\-in\-time view of your
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files, preventing errors caused by concurrent file modifications.
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.PP
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This option applies exclusively to data disks formatted with the Btrfs
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filesystem. Parity disks, or data disks using other filesystems, will
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always use the live version of the filesystem.
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.PP
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When enabled, SnapRAID ensures atomic and consistent operations by
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reading from a frozen point\-in\-time image. This prevents errors
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caused by file modifications during execution and ensures that
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updated and deleted files remain available for parity\-based
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recovery of other disks.
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This significantly improves recovery: if a file is deleted from the live
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filesystem, it remains preserved in the snapshot. This prevents the parity
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from becoming \[dq]broken\[dq] for that block, ensuring you can still successfully
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recover data if another disk fails.
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.PP
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See the SNAPSHOTS section for more details.
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Only Btrfs is supported. Snapshots are stored in a hidden \'.snapraid\'
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directory at the root of the Btrfs subvolume containing your data.
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SnapRAID will automatically detect the subvolume root for each data path.
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.PP
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Snapshot creation and deletion require administrative privileges.
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Ensure SnapRAID is run with the necessary permissions (e.g., sudo) when
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this option is enabled.
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.PP
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See the SNAPSHOTSsection for a detailed explanation of the snapshot
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lifecycle.
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.SS nohidden
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Excludes all hidden files and directories.
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In Unix, hidden files are those starting with \`.\`.
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@ -1799,11 +1810,26 @@ If a file is updated or deleted from the live filesystem,
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it remains preserved in the snapshot. If a disk failure occurs
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before the next sync is run, SnapRAID uses the data preserved
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in the snapshot to reconstruct the failed disk.
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.PD
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.PP
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.RS 4
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.PD 0
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In case of a disk failure during an active sync process,
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SnapRAID is also able to read automatically from both the
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snapshot of the previous parity computation and the current one.
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This maximizes the probability of a full recovery by
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providing access to the exact data blocks required to solve
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the parity equations, even if those blocks were modified
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or deleted between syncs.
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.PD
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.PP
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.PD 0
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Without snapshots, an updated or deleted file on a healthy
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disk results in missing data blocks that may be required to
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fix other failed disks.
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.PD
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.RE
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.RE
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.PP
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Snapshots are created only for data disks and only if the underlying
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filesystem supports this functionality. Parity disks always use
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@ -1812,6 +1838,10 @@ the live filesystem. At present, this is supported exclusively on Btrfs.
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You can mix data disks with different filesystems. Only those that
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support snapshots will utilize them, while other disks will continue
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to operate directly on the live filesystem.
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.PP
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Snapshot creation and deletion require administrative privileges.
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Ensure SnapRAID is run with the necessary permissions (e.g., sudo)
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when snapshots are enabled.
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.SS Command Behavior with Snapshots
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The \`sync\` and \`scrub\` commands both operate exclusively on snapshots
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to ensure that all data operations are performed against a consistent,
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@ -1827,16 +1857,20 @@ point that matches the existing parity.
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For the \`check\` and \`fix\` commands, the use of the last snapshot
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depends on whether specific disks are targeted using the
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\-d, \-\-filter\-disk option.
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Any disk explicitly selected for checking or fixing will use
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the live filesystem. This allows \`check\` to verify the current state of
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your files and \`fix\` to physically restore data to the active disk.
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.PP
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All other data disks not specified by the \-d, \-\-filter\-disk option
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will be accessed via their snapshots. These disks act as stable
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references, providing the necessary data blocks to solve the parity
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equations without interference from live changes. If no \-d option is
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provided, SnapRAID assumes the operation applies to the entire array,
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in this case, \`check\` and \`fix\` will use the live filesystems exclusively.
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A disk explicitly selected via \-d (the \[dq]target\[dq] of the operation)
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always uses the live filesystem. For \`fix\`, this allows restoring
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data to the active disk replacement. For \`check\`, it allows simulating
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the \`fix\` operation under the same conditions.
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.PP
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All other data disks (the \[dq]reference\[dq] disks) will be accessed via
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their snapshots. This ensures that even if you are modifying files
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on your healthy disks while a recovery is in progress, SnapRAID
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has a stable, frozen reference to solve the parity equations.
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.PP
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If no \-d option is provided, SnapRAID assumes the operation applies
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to the entire array, in this case, \`check\` and \`fix\` will use the
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live filesystems exclusively.
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.PP
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All other commands operate exclusively on the live filesystem.
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.SH SNAPSHOTS LIFECYCLE
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@ -388,9 +388,9 @@ Commands
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* Print the status of the array -> `status`
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* Control the disks -> `smart`, `probe`, `up`, `down`
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* Make a backup/snapshot -> `sync`
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* Make a backup/recovery point -> `sync`
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* Periodically check data -> `scrub`
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* Restore the last backup/snapshot -> `fix`.
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* Restore the last backup/recovery point -> `fix`.
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Commands must be written in lowercase.
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@ -594,9 +594,9 @@ Commands
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fix
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Fixes all the files and the parity data.
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All files and parity data are compared with the snapshot
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state saved in the last `sync`.
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If a difference is found, it is reverted to the stored snapshot.
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All files and parity data are compared with the state saved in
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the last `sync`.
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If a difference is found, it is reverted to the stored state.
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WARNING! The `fix` command does not differentiate between errors and
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intentional modifications. It unconditionally reverts the file state
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@ -1148,20 +1148,31 @@ Configuration
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snapshot
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Enable the use of filesystem snapshots for the `sync`, `scrub`,
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`check`, and `fix` commands, provided the underlying filesystem
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supports it.
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`check`, and `fix` commands.
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When enabled, SnapRAID creates a read-only snapshot of your data at the
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start of a 'sync'. This ensures a consistent, point-in-time view of your
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files, preventing errors caused by concurrent file modifications.
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|
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This option applies exclusively to data disks formatted with the Btrfs
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filesystem. Parity disks, or data disks using other filesystems, will
|
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always use the live version of the filesystem.
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When enabled, SnapRAID ensures atomic and consistent operations by
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reading from a frozen point-in-time image. This prevents errors
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caused by file modifications during execution and ensures that
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updated and deleted files remain available for parity-based
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recovery of other disks.
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This significantly improves recovery: if a file is deleted from the live
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filesystem, it remains preserved in the snapshot. This prevents the parity
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from becoming "broken" for that block, ensuring you can still successfully
|
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recover data if another disk fails.
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See the SNAPSHOTS section for more details.
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Only Btrfs is supported. Snapshots are stored in a hidden '.snapraid'
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directory at the root of the Btrfs subvolume containing your data.
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SnapRAID will automatically detect the subvolume root for each data path.
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Snapshot creation and deletion require administrative privileges.
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Ensure SnapRAID is run with the necessary permissions (e.g., sudo) when
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this option is enabled.
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See the SNAPSHOTSsection for a detailed explanation of the snapshot
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lifecycle.
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nohidden
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Excludes all hidden files and directories.
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@ -1419,6 +1430,15 @@ Snapshots
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it remains preserved in the snapshot. If a disk failure occurs
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before the next sync is run, SnapRAID uses the data preserved
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in the snapshot to reconstruct the failed disk.
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In case of a disk failure during an active sync process,
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SnapRAID is also able to read automatically from both the
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snapshot of the previous parity computation and the current one.
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This maximizes the probability of a full recovery by
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providing access to the exact data blocks required to solve
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the parity equations, even if those blocks were modified
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or deleted between syncs.
|
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Without snapshots, an updated or deleted file on a healthy
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disk results in missing data blocks that may be required to
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fix other failed disks.
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@ -1431,6 +1451,10 @@ Snapshots
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support snapshots will utilize them, while other disks will continue
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to operate directly on the live filesystem.
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Snapshot creation and deletion require administrative privileges.
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Ensure SnapRAID is run with the necessary permissions (e.g., sudo)
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when snapshots are enabled.
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Command Behavior with Snapshots
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The `sync` and `scrub` commands both operate exclusively on snapshots
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to ensure that all data operations are performed against a consistent,
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@ -1446,16 +1470,20 @@ Snapshots
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For the `check` and `fix` commands, the use of the last snapshot
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depends on whether specific disks are targeted using the
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-d, --filter-disk option.
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Any disk explicitly selected for checking or fixing will use
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the live filesystem. This allows `check` to verify the current state of
|
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your files and `fix` to physically restore data to the active disk.
|
||||
|
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All other data disks not specified by the -d, --filter-disk option
|
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will be accessed via their snapshots. These disks act as stable
|
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references, providing the necessary data blocks to solve the parity
|
||||
equations without interference from live changes. If no -d option is
|
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provided, SnapRAID assumes the operation applies to the entire array,
|
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in this case, `check` and `fix` will use the live filesystems exclusively.
|
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A disk explicitly selected via -d (the "target" of the operation)
|
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always uses the live filesystem. For `fix`, this allows restoring
|
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data to the active disk replacement. For `check`, it allows simulating
|
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the `fix` operation under the same conditions.
|
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|
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All other data disks (the "reference" disks) will be accessed via
|
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their snapshots. This ensures that even if you are modifying files
|
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on your healthy disks while a recovery is in progress, SnapRAID
|
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has a stable, frozen reference to solve the parity equations.
|
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|
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If no -d option is provided, SnapRAID assumes the operation applies
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to the entire array, in this case, `check` and `fix` will use the
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live filesystems exclusively.
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All other commands operate exclusively on the live filesystem.
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|
|
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@ -412,9 +412,9 @@ SnapRAID provides a few simple commands that allow you to:
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* Print the status of the array -> `status`
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* Control the disks -> `smart`, `probe`, `up`, `down`
|
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* Make a backup/snapshot -> `sync`
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* Make a backup/recovery point -> `sync`
|
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* Periodically check data -> `scrub`
|
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* Restore the last backup/snapshot -> `fix`.
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* Restore the last backup/recovery point -> `fix`.
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Commands must be written in lowercase.
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@ -636,9 +636,9 @@ The files in the array are NOT modified.
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Fixes all the files and the parity data.
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|
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All files and parity data are compared with the snapshot
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state saved in the last `sync`.
|
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If a difference is found, it is reverted to the stored snapshot.
|
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All files and parity data are compared with the state saved in
|
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the last `sync`.
|
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If a difference is found, it is reverted to the stored state.
|
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|
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WARNING! The `fix` command does not differentiate between errors and
|
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intentional modifications. It unconditionally reverts the file state
|
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|
@ -1226,20 +1226,31 @@ because they are expected to be always spinning.
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|||
------------
|
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|
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Enable the use of filesystem snapshots for the `sync`, `scrub`,
|
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`check`, and `fix` commands, provided the underlying filesystem
|
||||
supports it.
|
||||
`check`, and `fix` commands.
|
||||
|
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When enabled, SnapRAID creates a read-only snapshot of your data at the
|
||||
start of a 'sync'. This ensures a consistent, point-in-time view of your
|
||||
files, preventing errors caused by concurrent file modifications.
|
||||
|
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This option applies exclusively to data disks formatted with the Btrfs
|
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filesystem. Parity disks, or data disks using other filesystems, will
|
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always use the live version of the filesystem.
|
||||
|
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When enabled, SnapRAID ensures atomic and consistent operations by
|
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reading from a frozen point-in-time image. This prevents errors
|
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caused by file modifications during execution and ensures that
|
||||
updated and deleted files remain available for parity-based
|
||||
recovery of other disks.
|
||||
This significantly improves recovery: if a file is deleted from the live
|
||||
filesystem, it remains preserved in the snapshot. This prevents the parity
|
||||
from becoming "broken" for that block, ensuring you can still successfully
|
||||
recover data if another disk fails.
|
||||
|
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See the SNAPSHOTS section for more details.
|
||||
Only Btrfs is supported. Snapshots are stored in a hidden '.snapraid'
|
||||
directory at the root of the Btrfs subvolume containing your data.
|
||||
SnapRAID will automatically detect the subvolume root for each data path.
|
||||
|
||||
Snapshot creation and deletion require administrative privileges.
|
||||
Ensure SnapRAID is run with the necessary permissions (e.g., sudo) when
|
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this option is enabled.
|
||||
|
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See the SNAPSHOTSsection for a detailed explanation of the snapshot
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lifecycle.
|
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7.8 nohidden
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------------
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@ -1524,6 +1535,15 @@ Recovery - If a file is updated or deleted from the live filesystem,
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it remains preserved in the snapshot. If a disk failure occurs
|
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before the next sync is run, SnapRAID uses the data preserved
|
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in the snapshot to reconstruct the failed disk.
|
||||
|
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In case of a disk failure during an active sync process,
|
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SnapRAID is also able to read automatically from both the
|
||||
snapshot of the previous parity computation and the current one.
|
||||
This maximizes the probability of a full recovery by
|
||||
providing access to the exact data blocks required to solve
|
||||
the parity equations, even if those blocks were modified
|
||||
or deleted between syncs.
|
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|
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Without snapshots, an updated or deleted file on a healthy
|
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disk results in missing data blocks that may be required to
|
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fix other failed disks.
|
||||
|
|
@ -1536,6 +1556,10 @@ You can mix data disks with different filesystems. Only those that
|
|||
support snapshots will utilize them, while other disks will continue
|
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to operate directly on the live filesystem.
|
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|
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Snapshot creation and deletion require administrative privileges.
|
||||
Ensure SnapRAID is run with the necessary permissions (e.g., sudo)
|
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when snapshots are enabled.
|
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8.1 Command Behavior with Snapshots
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-----------------------------------
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@ -1553,16 +1577,20 @@ point that matches the existing parity.
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For the `check` and `fix` commands, the use of the last snapshot
|
||||
depends on whether specific disks are targeted using the
|
||||
-d, --filter-disk option.
|
||||
Any disk explicitly selected for checking or fixing will use
|
||||
the live filesystem. This allows `check` to verify the current state of
|
||||
your files and `fix` to physically restore data to the active disk.
|
||||
|
||||
All other data disks not specified by the -d, --filter-disk option
|
||||
will be accessed via their snapshots. These disks act as stable
|
||||
references, providing the necessary data blocks to solve the parity
|
||||
equations without interference from live changes. If no -d option is
|
||||
provided, SnapRAID assumes the operation applies to the entire array,
|
||||
in this case, `check` and `fix` will use the live filesystems exclusively.
|
||||
A disk explicitly selected via -d (the "target" of the operation)
|
||||
always uses the live filesystem. For `fix`, this allows restoring
|
||||
data to the active disk replacement. For `check`, it allows simulating
|
||||
the `fix` operation under the same conditions.
|
||||
|
||||
All other data disks (the "reference" disks) will be accessed via
|
||||
their snapshots. This ensures that even if you are modifying files
|
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on your healthy disks while a recovery is in progress, SnapRAID
|
||||
has a stable, frozen reference to solve the parity equations.
|
||||
|
||||
If no -d option is provided, SnapRAID assumes the operation applies
|
||||
to the entire array, in this case, `check` and `fix` will use the
|
||||
live filesystems exclusively.
|
||||
|
||||
All other commands operate exclusively on the live filesystem.
|
||||
|
||||
|
|
|
|||
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Reference in a new issue