From: David Liontooth <lionteeth@cogweb.net>
To: linux-raid@vger.kernel.org
Subject: Raid0 rebuild slows to a crawl
Date: Fri, 13 Jan 2012 13:31:17 +0530 [thread overview]
Message-ID: <4F0FE4CD.3070703@cogweb.net> (raw)
I'm trying to use a WD3200AAKX-001CA0 drive in a raid1 configuration
(Debian squeeze mdadm 3.1.4-1+8efb9d1), but adding it is unusably slow:
# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdb3[2] sda3[1]
73015360 blocks [2/1] [_U]
[>....................] recovery = 0.0% (28928/73015360)
finish=2521.6min speed=482K/sec
dmesg shows no errors:
md: recovery of RAID array md0
md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
md: using maximum available idle IO bandwidth (but not more than 200000
KB/sec) for recovery.
The drive itself doesn't seem to have a problem, though it's not
particularly fast:
# hdparm -tT /dev/sdb
/dev/sdb:
Timing cached reads: 11220 MB in 2.00 seconds = 5614.03 MB/sec
Timing buffered disk reads: 174 MB in 6.44 seconds = 27.01 MB/sec
# smartctl -a /dev/sdb
5 Reallocated_Sector_Ct 0x0033 133 133 140 Pre-fail Always
FAILING_NOW 1265
# hdparm -i /dev/sdb
/dev/sdb:
Model=WDC WD3200AAKX-001CA0, FwRev=15.01H15, SerialNo=WD-WCAYUEJ66523
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=50
BuffType=unknown, BuffSize=16384kB, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=625142448
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=no WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6,7
* signifies the current active mode
Is this a known problem? Only see it with this WD drive.
Cheers,
Dave
next reply other threads:[~2012-01-13 8:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-13 8:01 David Liontooth [this message]
2012-01-13 8:44 ` Raid0 rebuild slows to a crawl Kay Diederichs
2012-01-13 9:36 ` David Liontooth
2012-01-13 8:46 ` Raid1 " Robin Hill
2012-01-14 20:13 ` Raid0 " Stefan /*St0fF*/ Hübner
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