Re: Raid0 rebuild slows to a crawl

[David Liontooth <lionteeth@xxxxxxxxxx>]

Much appreciated! I'll notify next-of-kin.

Cheers,
Dave

On 01/13/2012 02:14 PM, Kay Diederichs wrote:
> On 01/13/2012 09:01 AM, David Liontooth wrote:
> > 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
>
> Hi Dave,
>
> I'd say your drive is dying if its Reallocated_Sector_Ct is 1265. 
> Dying drives often are really slow; they spend the time on trying to 
> overcome error states.
>
> HTH,
> Kay

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