yeah, i think this data corruption could/should be implemented as badblocks...
do you have a disk that read blocks with wrong data like you told?
if yes, could you check if it have bad blocks? (via some software,
since i don´t know if linux kernel will report it as badblock on dmesg
or something else)
some disk manufacturers have MSDOS compatible program to check disk
badblocks and others features... check if it´s a real bad block, or a
disk problem (controller/data comunication)
2012/7/18 Jaromir Capik [off-list ref]
quoted
quoted
Hello.
I'd like to ask you to implement the following ...
The current RAID1 solution is not robust enough to protect the data
against random data corruptions. Such corruptions usually happen
when an unreadable sector is found by the drive's electronics
and when the drive's trying to reallocate the sector to the spare
area.
There's no guarantee that the reallocated data will always match
the original stored data since the drive sometimes can't read the
data
correctly even with several retries. That unfortunately completely
masks
the issue, because the sector can be read by the OS without
problems
even if it doesn't contain correct data. Would it be possible
to implement chunk checksums to avoid such data corruptions?
If a corrupted chunk is encountered, it would be taken from the
second
drive and immediately synced back. This would have a small
performance
and capacity impact (1 sector per chunk to minimize performance
impact
caused by unaligned granularity = 0.78% of the capacity with 64k
chunks).
Please, let me know if you find my request reasonable or not.
I believe alternative to that is implemented via the Linux RAID MD
badblock feature.
Hello keld ...
I couldn't find any info about that feature. Could you please give
me more info about that?
Thanks in advance.
Regards,
Jaromir.
quoted
best regards
keld
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Roberto Spadim
Spadim Technology / SPAEmpresarial
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