Brad Campbell wrote:
[...]
Actually, I'm not sure without the libata dev patch as that removes SMART support, and I'm not convinced that my smartd polling every 20 minutes does not have something to do with it. All I know is the older kernel seems to cope. We'll see. 320 minutes left on this rebuild. I expect it will be done in the morning if all goes according to plan. (With the 2.6.11 kernel it never survived past about 25% rebuilt)
Can you find time to try it without smartd active ? You report running a uni-processor system, and I have only seen PIO problems with (fast) SMP systems in my testing, but I am forming the opinion that libata-PIO functions are in need of a minor overhaul.
I have seen issues where port activity monopolised data-paths/arbitration inside chipsets such that the PIO operations would appear to time out. Since you're doing a raid rebuild, perhaps the I/O load is causing something similar to occur.
Does the PIO code deviate from the ATA/ATAPI-[4567] host state machine somehow?
Or is it just that newer SATA-emulating-PATA chips have trouble with it?
Jeff
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