Messages in this thread | | | From | Guillaume Laurès <> | Subject | Re: PROBLEM: I/O scheduler problem with an 8 SATA disks raid 5 under heavy load ? | Date | Wed, 20 Feb 2008 12:35:14 +0100 |
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Hello all,
A bit of update to this issue.
Switching the cabling of the most problematic drive with a new one didn't fix the issue. I couldn't yet switch the power supply with a more powerful one. However I temporarily added a pci-e SATA host and another drive, the situation was just as bad, not worse ;-) This HBA just had 2 ports, so I couldn't swap it completely with the nvidia ports.
Just as a guess I added sata_nv.adma=0 and the problem completly disappeared for 4 weeks now. Removing it from cmdline just make it come back.
Unfortunately I'm running xen on this host so I don't think adma patches if any may be suitable to me, at least as long as something > 2.6.20 doesn't come in gentoo for xen...
Regards,
GoM
Le 9 janv. 08 à 01:00, Robert Hancock a écrit :
>> So it seems to be either a cabling problem or a bug with sata_nv ? >> I'm running gentoo's 2.6.20-xen, and maybe my problem looks like >> the sata_nv/adma/samsung problems reports I can see on the net ? > > I don't think it's the same problem. In that case the controller > appears to indicate that it didn't even start processing the > command. In this case it's indicating that the command was sent to > the drive and is still waiting for it to indicate completion. > > It could be a cabling problem, yes. Also, are you sure your power > supply is able to handle the power draw of that many drives?
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