Tejun Heo wrote:
Hello,
Giulio Orsero wrote:
Supermicro P8SC8, CENTOS/RHEL 5.x 2.6.18-128.el5
HD: Seagate SATA ST3120827AS fw3.42 [2 disks in md raid1]
00:1f.1 0101: 8086:266f (rev 03)
00:1f.2 0101: 8086:2652 (rev 03)
2652 is handled by both ata_piix and ahci.
Using ata_piix everything is fine, using ahci will cause periodic errors
like:
ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
ata1.00: cmd 61/08:00:4d:6d:c0/00:00:00:00:00/40 tag 0 ncq 4096 out
res 40/00:00:b5:95:a7/00:00:00:00:00/40 Emask 0x4 (timeout)
ata1.00: status: { DRDY }
ata1: hard resetting link
ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata1.00: configured for UDMA/133
ata1: EH complete
SCSI device sda: 234441648 512-byte hdwr sectors (120034 MB)
sda: Write Protect is off
SCSI device sda: drive cache: write back
Using
echo 1 > /sys/block/sda/device/queue_depth
echo 1 > /sys/block/sdb/device/queue_depth
will eliminate the issue, so please add
{ "ST3120827AS", "3.42", ATA_HORKAGE_NONCQ },
to the NCQ blacklist.
That's a 7200.7 which has been quite popular && happens to be used
extensively during libata development, so I'm highly doubtful the
problem is a wide spread one. The problem is more likely to be
something specific to your configuration.
Indeed, I have a ST3160827AS (the 160GB version of that drive) with 3.42
firmware and haven't seen any problems with NCQ..
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