On 2009-09-18T00:44:45, Tejun Heo wrote: > Hello, > > Chris Webb wrote: > > It's quite hard for us to do this with these machines as we have > > them managed by a third party in a datacentre to which we don't have > > physical access. However, I could very easily get an extra 'test' > > machine built in there, generate a work load that consistently > > reproduces the problems on the six drives, and then retry with an > > array build from 5, 4, 3 and 2 drives successively, taking out the > > unused drives from chassis, to see if reducing the load on the power > > supply with a smaller array helps. > > Yeap, that also should shed some light on it. I have a SuperMicro X8DT3-F motherboard with 2 (2 TB) WDC drives of the 8 bays available in the machine. They are on a different controller LSI Logic / Symbios Logic SAS1068E PCI-Express Fusion-MPT SAS which was flashed into "Integrated Target Mode" to get it running under Linux. Disabling smartmontools seems to have helped in terms of failure frequency. It is almost always the 2nd drive that is kicked out of the mirror although the last time it was the primary after disabling smart. hddtemp was never running on this host. [2256003.055451] end_request: I/O error, dev sdb, sector 3907028974 [2256003.055674] md: super_written gets error=-5, uptodate=0 [2256003.055677] raid1: Disk failure on sdb2, disabling device. [2256003.055678] raid1: Operation continuing on 1 devices. [2256003.437315] RAID1 conf printout: [2256003.437318] --- wd:1 rd:2 [2256003.437321] disk 0, wo:0, o:1, dev:sda2 [2256003.437323] disk 1, wo:1, o:0, dev:sdb2 [2256003.440542] RAID1 conf printout: [2256003.440545] --- wd:1 rd:2 [2256003.440548] disk 0, wo:0, o:1, dev:sda2 [3880879.007618] end_request: I/O error, dev sda, sector 3907028974 [3880879.007839] md: super_written gets error=-5, uptodate=0 [3880879.007842] raid1: Disk failure on sda2, disabling device. [3880879.007843] raid1: Operation continuing on 1 devices. [3880879.028518] RAID1 conf printout: [3880879.028521] --- wd:1 rd:2 [3880879.028524] disk 0, wo:1, o:0, dev:sda2 [3880879.028527] disk 1, wo:0, o:1, dev:sdb2 [3880879.031607] RAID1 conf printout: [3880879.031610] --- wd:1 rd:2 [3880879.031613] disk 1, wo:0, o:1, dev:sdb2 There is barely any load on this box. Disabling NCQ did not help for me. /Allan -- Allan Wind Life Integrity, LLC <http://lifeintegrity.com> -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
