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1b1ed1a
(Get the code!)
Hi,
I've been in contact with Manoj through IRC. He advised me to try the latest 2.6.37 release candicate kernel.
So far it seems to be a huge improvement. I've run several disks on the machine with this kernel and had bonnie++ running on them several days (in md raid 1).
What is odd is that the first day I frequently had messages that a bonnie++ process hadn't received any I/O for 120 secs. Lowered that message's threshold to 60 seconds. Strangely, the 5 processes where *NEVER* listed at the same time. So it seems only 1 or 2 out of the 5 got out of I/O at the same time.
Anyways... the messages just disappeared after 1 - 1.5 days. Haven't seen them since. Maybe they'll come back (temporarily) if I reboot, but can't test this now.
By now we have bought 8 Seagate ST32000542AS disks. Had these running badblocks (individually). There seems to be some performance difference in the disks (running badblocks, full pass (all 4 patterns) on 2TB disks takes LONG). Most only varied a couple of hours, but the last disk in the chain was a full round (write and read) test behind when the first disk finished. The last disk in the chain was at about 1% writing pattern 0x00 when the first disk finished. This makes is about 25% slower than the rest of the disks.
As stated all disks showed variation, but none of them as much as this. Not sure if it's the disk or the array though. Unfortunately the machine is quite a bit away so can't swap disks easily.
So far the 2.6.37 rc seems stable with the controller with SATA disks. Usually I couldn't even finish building md RAID sets and it's stable for quite some time now. It will be receiving real load in a couple of days, if I notice anything weird I'll get back.