Re: Raid0 rebuild slows to a crawl

["Stefan /*St0fF*/ Hübner" <stefan.huebner@stud.tu-ilmenau.de>]

This drive is failing now - just as smartctl indicates.  I suggest you
stop that rebuild (as it was dropped for a reason), exchange the drive,
then restart/rebuild with a new drive.

Stefan

Am 13.01.2012 09:01, schrieb David Liontooth:
> 
> 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
> 
> 
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