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SubjectRe: 2.6.18 - AHCI detection pauses excessively
Berck E. Nash wrote:
> [ 68.242305] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> [ 98.221334] ata2.00: qc timeout (cmd 0xec)
> [ 98.225467] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
> [ 108.063137] ata2: port is slow to respond, please be patient (Status 0x80)
> [ 131.003980] ata2: port failed to respond (30 secs, Status 0x80)
> [ 131.009930] ata2: COMRESET failed (device not ready)
> [ 131.014926] ata2: hardreset failed, retrying in 5 secs
> [ 138.308717] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> [ 138.319554] ata2.00: ATA-6, max UDMA/133, 640 sectors: LBA
> [ 138.325157] ata2.00: ata2: dev 0 multi count 1
> [ 138.334245] ata2.00: configured for UDMA/133
[--snip--]
> [ 143.191590] scsi 2:0:0:0: Direct-Access ATA Config Disk RGL1 PQ: 0 ANSI: 5
> [ 143.199761] SCSI device sdd: 640 512-byte hdwr sectors (0 MB)
> [ 143.205550] sdd: Write Protect is off
> [ 143.209257] SCSI device sdd: write cache: disabled, read cache: enabled, doesn't support DPO or FUA
> [ 143.218356] SCSI device sdd: 640 512-byte hdwr sectors (0 MB)
> [ 143.224143] sdd: Write Protect is off
> [ 143.227847] SCSI device sdd: write cache: disabled, read cache: enabled, doesn't support DPO or FUA
> [ 143.236927] sdd: unknown partition table
> [ 143.241194] sd 2:0:0:0: Attached scsi disk sdd
> [ 143.245707] sd 2:0:0:0: Attached scsi generic sg3 type 0

Ahh.. I can't believe I missed this again. A Port Multiplier is
attached to your ata2 which is probably a sil3726 or 4726. Why this
device fails initial reset is unknown yet. Anyways, with proper PMP
support, this problem will go away. So, this isn't really a ahci issue
and there's nothing wrong with your disks either. I'll ask SIMG why
this happens with the PMP.

--
tejun
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