From: Benjamin Kingston <ben@bencloud.net>
To: linux-raid@vger.kernel.org
Subject: VERY slow mdadm recovery speed 12KB/s
Date: Thu, 4 Mar 2010 22:27:49 -0700 [thread overview]
Message-ID: <a889ac7d1003042127j3c3e7928y107126aff1c9a6e8@mail.gmail.com> (raw)
In-Reply-To: <a889ac7d1003042123x7473976dw8ffe2af6f2844afc@mail.gmail.com>
I did some musical HDDs to get my "best" drives to hold a critical md
device, then one failed after a power surge. So I bought a new disk
and added it, then accidentally marked it as failed in the middle of
recovery. I then removed the disk and added it again. I got the
message "/dev/sdd re-added to /dev/md1"
When I do a cat /proc/mdstat the recovery speed is at 55KB/s and
subsequent views of /proc/mdstat show that the speed goes all the way
to 12KB/s or lower. I've since removed and re-added the drive a few
times, but the same thing happens every time and if I leave everything
alone while it resyncs, my CPU usage sky rockets to something like
16.8 23.4 40.5.
Any help would be really appreciated as I don't want to loose the
"good" drive. I know both have good speeds, because I can write at
4MB/s to ext4/luks on md1 and 15MB/s on /dev/sdd with dd.
P.S. could someone also explain to me the difference between md0 and md_d0?
next parent reply other threads:[~2010-03-05 5:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <a889ac7d1003042123x7473976dw8ffe2af6f2844afc@mail.gmail.com>
2010-03-05 5:27 ` Benjamin Kingston [this message]
2010-03-05 8:55 ` VERY slow mdadm recovery speed 12KB/s Michael Evans
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