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Converts prehash to be a command line option.

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Andrea Mazzoleni 2014-02-12 22:04:14 +01:00
parent c420391493
commit 857c8eba63
11 changed files with 109 additions and 125 deletions
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35
snapraid.1
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@ -14,7 +14,7 @@ snapraid [\-c, \-\-conf CONFIG]
.PD 0
.PP
.PD
[\-a, \-\-audit\-only] [\-i, \-\-import DIR]
[\-a, \-\-audit\-only] [\-h, \-\-pre\-hash] [\-i, \-\-import DIR]
.PD 0
.PP
.PD
@ -43,7 +43,7 @@ snapraid [\-c, \-\-conf CONFIG]
.PP
.PD
.PP
snapraid [\-V, \-\-version] [\-h, \-\-help] [\-C, \-\-gen\-conf CONTENT]
snapraid [\-V, \-\-version] [\-H, \-\-help] [\-C, \-\-gen\-conf CONTENT]
.PD 0
.PP
.PD
@ -737,12 +737,28 @@ Blocks marked as bad are always scrubbed despite this option.
This option can be used only with the \(a"scrub\(a" command.
.TP
.B \-a, \-\-audit\-only
Verifies the hash of the files, with the \(a"check\(a" command,
without doing any kind of check on the parity data.
In the \(a"check\(a" command verifies the hash of the files without
doing any kind of check on the parity data.
If you are interested in checking only the file data this
option can speedup a lot the checking process.
This option can be used only with the \(a"check\(a" command.
.TP
.B \-h, \-\-pre\-hash
In the \(a"sync\(a" command run a preliminary hashing phase of all
the new data to ensure that during the parity computation
the data read is correct.
Normally in \(a"sync\(a" no preliminary hashing is done, and the new
data is hashed directly during the parity computation when it\(cqs
read for the first time,
This happens when the system is under heavy pressure due all
disks spinning and CPU busy, and in such extreme conditions,
if your machine has a latent hardware problem, it\(cqs possible to
encouter silent errors what cannot be detected because the data
is not yet hashed.
To avoid this risk, you can enable the \(a"pre\-hash\(a" mode and have
all the data hashed two times to ensure its integrity.
This option can be used only with the \(a"sync\(a" command.
.TP
.B \-i, \-\-import DIR
Imports from the specified directory any file that you deleted
from the array after the last \(a"sync\(a" command.
@ -974,17 +990,6 @@ commands interrupted by a machine crash, or any other event that
may interrupt SnapRAID.
The SIZE argument is specified in gibibytes. Where one gibi bytes
is 1073741824 bytes.
.SS prehash
Enables a double pass \(a"sync\(a" process with an initial hashing phase.
In the default \(a"sync\(a" mode no preliminary hashing is done, and the new
data is hashed directly during the parity computation when it\(cqs read
for the first time,
This happens when the system is under heavy pressure due all disks spinning
and CPU busy, and in such extreme conditions, if your machine has a latent
hardware problem, it\(cqs possible to encouter silent errors what cannot be
detected because the data is not yet hashed.
To avoid this risk, you can enable the \(a"prehash\(a" mode and have all the
data hashed two times to ensure its integrity.
.SS pool DIR
Defines the pooling directory where the virtual view of the disk
array is created using the \(a"pool\(a" command.