[mythtv-users] Horrendous RAID-6 performance
John Drescher
drescherjm at gmail.com
Fri Mar 28 21:44:03 UTC 2008
On Fri, Mar 28, 2008 at 5:34 PM, Yan Seiner <yan at seiner.com> wrote:
> My system has a 1.2 TB RAID-6 formatted as a single ext3 partition. All
> was well for a while, then I had a minor crash, and had to repair the
> raid. (manual fsck kind of repair).
>
> Now I get absolutely horrible RAID performance:
>
> selene:/var/log# hdparm -tT /dev/md10
>
> /dev/md10:
> Timing cached reads: 2472 MB in 2.00 seconds = 1236.69 MB/sec
> Timing buffered disk reads: 10 MB in 3.23 seconds = 3.10 MB/sec
>
> WTF? Can anyone provide a clue on how to debug this?
>
> I've been all through the system, nothing shows any sort of error, nothing
> in the logs, mdadmin is happy, smartd is happy, the partition fsck's
> clean.
>
> Could this be because the system is getting full? (I'm clutching at straws
> here.)
>
> selene:/var/log# df /dev/md10
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/md10 1538311980 1279051236 243632396 84% /data
>
> Is there some way to verify / rebuild the raid in-place? I could get most
> of the data off and reformat, but obviously I'd rather not....
>
can you post the output of cat /proc/mdstat
John
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