From: Brad Campbell <brad@wasp.net.au>
To: RAID Linux <linux-raid@vger.kernel.org>
Subject: "Rebuild" speed on a forced resync
Date: Tue, 11 Jan 2005 13:47:33 +0400 [thread overview]
Message-ID: <41E3A0B5.209@wasp.net.au> (raw)
G'day all,
Just started my big raid using mdadm --update resync to ensure the parity blocks are A-OK after a
kernel panic, and I have been monitoring my Disk IO with
iostat -k 5
Now this is an average for a 5 second period.
I note I'm seeing about 12,456 Kilobytes/sec from each drive, but a cat /proc mdstat is giving me
6716 Kilobytes/sec. Given I'm doing a read consistency check I would expect an mdstat speed 9/10ths
of my bulk per-drive read speed. (This array is sda -> sdj)
Am I missing something really obvious?
Kernel 2.6.10-bk10
Regards,
Brad
avg-cpu: %user %nice %sys %iowait %idle
39.18 0.00 60.82 0.00 0.00
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
hda 0.00 0.00 0.00 0 0
sda 97.76 12465.67 0.00 33408 0
sdb 97.76 12465.67 0.00 33408 0
sdc 97.76 12465.67 0.00 33408 0
sdd 97.76 12465.67 0.00 33408 0
sde 97.76 12465.67 0.00 33408 0
sdf 98.51 12465.67 0.00 33408 0
sdg 98.51 12465.67 0.00 33408 0
sdh 98.88 12465.67 0.00 33408 0
sdi 107.09 12465.67 0.00 33408 0
sdj 104.85 12465.67 0.00 33408 0
sdk 3.73 5.97 10.45 16 28
sdl 4.10 11.94 5.97 32 16
sdm 5.22 14.93 7.46 40 20
md0 0.00 0.00 0.00 0 0
md2 8.58 26.87 7.46 72 20
srv:/home/brad# cat /proc/mdstat
Personalities : [raid0] [raid5] [raid6]
md2 : active raid5 sdl[0] sdm[2] sdk[1]
488396800 blocks level 5, 128k chunk, algorithm 2 [3/3] [UUU]
md0 : active raid5 sda1[0] sdj1[9] sdi1[8] sdh1[7] sdg1[6] sdf1[5] sde1[4] sdd1[3] sdc1[2] sdb1[1]
2206003968 blocks level 5, 128k chunk, algorithm 0 [10/10] [UUUUUUUUUU]
[===>.................] resync = 17.4% (42765824/245111552) finish=501.9min speed=6716K/sec
unused devices: <none>
next reply other threads:[~2005-01-11 9:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-11 9:47 Brad Campbell [this message]
2005-01-12 0:33 ` "Rebuild" speed on a forced resync Neil Brown
2005-01-14 18:34 ` Brad Campbell
2005-01-12 0:48 ` Guy
2005-01-12 4:31 ` Brad Campbell
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