From: "Niccolò Belli" <darkbasic@linuxsystems.it>
To: linux-raid@vger.kernel.org
Subject: Re: raid1 issue after disk failure: both disks of the array are still active
Date: Thu, 13 Sep 2012 12:46:42 +0200 [thread overview]
Message-ID: <5051B992.7030200@linuxsystems.it> (raw)
In-Reply-To: <20120913103432.GA11764@cthulhu.home.robinhill.me.uk>
Il 13/09/2012 12:34, Robin Hill ha scritto:
> Has anything actually attempted to read from that part of the array?
> Even if so, it may just have happened to read from the working disk
> anyway. md can only detect the error when it tries to read/write that
> sector of that disk.
I forced a read with "dd if=/dev/md0 of=/dev/null bs=524228 count=1
skip=1", I even get errors in syslog!
> Your best bet now is to do an array check:
> echo check> /sys/block/md0/md/sync_action
>
> This will force a read of all disks in the array. This should trigger
> the read error, causing an attempt to re-write the faulty block, in turn
> causing the drive remap the bad sector (assuming the re-write fails).
> This should also be scheduled to run regularly for all arrays in order
> to pick up these sort of issues before they cause major problems during
> a rebuild.
/etc/init.d/mdadm should do exactly this kind of things (distro is
Debian Squeeze). I have this in cron.d:
57 0 * * 0 root if [ -x /usr/share/mdadm/checkarray ] && [ $(date +\%d)
-le 7 ]; then /usr/share/mdadm/checkarray --cron --all --idle --quiet; fi
Unfortunately it seems it didn't work :(
Shouldn't a dd if=/dev/md0 be enough to trigger the read error?
Thanks,
Niccolò
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next prev parent reply other threads:[~2012-09-13 10:46 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-13 10:01 raid1 issue after disk failure: both disks of the array are still active Niccolò Belli
2012-09-13 10:34 ` Robin Hill
2012-09-13 10:46 ` Niccolò Belli [this message]
[not found] ` <5051BBC3.4050805@websitemanagers.com.au>
2012-09-13 11:29 ` Niccolò Belli
[not found] ` <CABYL=TpKD2B0vwTrHH=iFK3PcMWueEsi84ACRbBQkDXuiWG3kw@mail.gmail.com>
2012-09-13 15:32 ` Roberto Spadim
2012-09-13 15:48 ` Niccolò Belli
2012-09-13 15:53 ` Roberto Spadim
2012-09-14 7:54 ` Niccolò Belli
2012-09-13 17:02 ` Chris Murphy
2012-09-13 17:39 ` Roberto Spadim
2012-09-13 20:13 ` Chris Murphy
2012-09-14 7:16 ` Mikael Abrahamsson
2012-09-14 7:45 ` Niccolò Belli
2012-09-14 18:04 ` Chris Murphy
2012-09-14 18:27 ` Robin Hill
2012-09-14 18:53 ` Chris Murphy
2012-09-15 19:05 ` Niccolò Belli
2012-09-15 19:41 ` Robin Hill
2012-09-15 22:06 ` Niccolò Belli
2012-09-16 10:18 ` Robin Hill
2012-09-16 10:42 ` Niccolò Belli
2012-09-16 15:26 ` Chris Murphy
2012-09-16 15:31 ` Niccolò Belli
2012-09-16 23:35 ` Niccolò Belli
2012-09-17 0:00 ` Chris Murphy
2012-09-17 0:03 ` Niccolò Belli
2012-09-14 8:13 ` NeilBrown
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