8.0-RELEASE: disk IO temporarily hangs up (ZFS or ATA related problem)

Attilio Rao attilio at freebsd.org
Fri Dec 18 18:04:52 UTC 2009

2009/12/17 Alexander Zagrebin <alexz at visp.ru>:
> Hi!
> I use onboard ICH7 SATA controller with two disks attached:
> atapci1: <Intel ICH7 SATA300 controller> port
> 0x30c8-0x30cf,0x30ec-0x30ef,0x30c0-0x30c7,0x30e8-0x30eb,0x30a0-0x30af irq 19
> at device 31.2 on pci0
> atapci1: [ITHREAD]
> ata2: <ATA channel 0> on atapci1
> ata2: [ITHREAD]
> ata3: <ATA channel 1> on atapci1
> ata3: [ITHREAD]
> ad4: 1430799MB <Seagate ST31500541AS CC34> at ata2-master SATA150
> ad6: 1430799MB <WDC WD15EADS-00P8B0 01.00A01> at ata3-master SATA150
> The disks are used for mirrored ZFS pool.
> I have noticed that the system periodically locks up on disk operations.
> After approx. 10 min of very slow disk i/o (several KB/s) the speed of disk
> operations restores to normal.
> gstat has shown that the problem is in ad6.

Want you try this patch and report?:

It should apply to STABLE_8 and if not, just report and I will help.


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