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Revising the TODO list.

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Andrea Mazzoleni 2011-05-24 22:21:12 +02:00
parent 900c0e9297
commit b12358ba50
1 changed files with 42 additions and 7 deletions
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TODO
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@ -1,12 +1,17 @@
SnapRAID TODO
=============
This is a list of possible TODO for SnapRAID. The order is not relevant.
This is a list of possible TODO items for SnapRAID. The order is not relevant.
* Add a checksum for the content file. When reading if the file is invalid,
* If a file cannot be synched, for example because it was changing, of it
the file name cannot be supported, it's better to do not stop the sync process.
The sync process should stop only if the error could be caused by a disk
corruption.
* Adds a checksum for the content file. When reading if the file is invalid,
skip to another.
* Change the output format allowing a more easy integration with other utilities
* Changes the output format allowing a more easy integration with other utilities
like sort. For example to allow to sort by file, disk or block all the output
messages in check/fix.
@ -14,14 +19,44 @@ messages in check/fix.
* Easy way to find files using a specified block.
* Implement a restore command to recover files, without the integrity check.
* Implements a restore command to recover files, without the integrity check.
* When fixing, overwrite the present file only if the backuped one can be
completely restored.
* Recognize that a file is moved from one disk to another, and if the parity
Delayed TODO
============
This is a list of low priority TODO items. The order is not relevant.
* Recognizes that a file is moved from one disk to another, and if the parity
data doesn't overlap, do not recompute it.
- It's going to work only in RAID5 mode and only in special cases.
* Use the O_NOATIME flag if run as 'root'. Anyway a better solution is to
mount the disk with the "noatime" and "nodiratime" options.
* Uses the O_NOATIME flag if run as 'root'.
- A better solution is to mount the disk with the "noatime" mount option.
Note also that at mount time you can also use the "nodiratime", and this is
the only way to specify it.
* Implements a multithread sync command.
- At now it's questionable if it will result in a performance improvment.
The murmur3 hash, and the RAID5/6 computations are so fast that even a single
thread should be able to do them.
Use the "snapraid -T" comment to see the speed.
Also, all the file operations are already done in background by the OS,
so no improvement is expect from this side.
* The SSE2 RAID6 computation may be slower than the MMX version.
See for example this case on a AMD Zacate APU E-350 1.6GHz:
memset 1812 [MB/s]
MD5 252 [MB/s]
Murmur3 1116 [MB/s]
RAID5 int32x2 1692 [MB/s]
RAID5 mmxx2 1745 [MB/s]
RAID5 sse2x2 2481 [MB/s]
RAID6 int32x2 807 [MB/s]
RAID6 mmxx2 1304 [MB/s]
RAID6 sse2x2 787 [MB/s]
- Waiting for other similar reports. A single one may be a spurious case.