Neil Brown wrote:
On Tuesday February 27, davidsen@xxxxxxx wrote:
Neil Brown wrote:
When md find a bad block (read failure) it either fixes it (by
successfully over-writing the correct date) or fails the drive.
The count of the times that this has happened is available via
/sys/block/mdX/md/errors
What kernel provides this? I have system running everything from 2.6.15
to 2.6.20-get14, and there is no such file in any of them. There is a
per-device errors file one level down, but that presumably wouldn't be
in the superblock.
Sorry, I did get that wrong. As you say it is a per-device field:
/sys/block/mdX/md/dev-*/errors
which makes sense because it is individual devices that get errors,
not whole arrays. And it *is* stored in the superblock for v1. The
superblock has a per-device section which is potentially different on
each device, The corrected-error count is stored there.
OK, I can add...
Do I have to go from 0.90 to v1 or later superblocks to get this, and if
so is that a safe thing to do?
It is not currently easy to convert a v0.90 array to use v1
superblocks. I should put that on my todo list as it isn't
conceptually hard.
Unfortunately the thing I'd like most is hard (RAID5E), but if/when the
SB conversion is available I would give it a test drive.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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