On 15/06/11 22:15, Paul Faure wrote: > I upgraded my raid disks to 4 ST32000644NS (Seagate Constellation 2TB) and I > haven't had an issue since. > > I have also moved the cheaper ST2000DL003-9VT166 disks to a Windows XP box > (in a non raid environment) and haven't seen a problem in days now. > > There are plenty of references online now popping up saying that green disks > are not designed or supported in a raid environment. Weather or not that's > because of a physical issue, or a software issue, im not sure. > > Paul > Just a guess: One of the "features" of green drivers is that they park the heads every few seconds [1] without disk activity. Can this be the root of the problem? Perhaps the HDDs are slow responding when they have the heads parked (which tends to happen too much often than with normal drives) and this causes this issue. You can disable this by forcing a one-hour timeout for parking the heads with: hdparm -S 242 /dev/sdX This needs to be done at boot time each time. Perhaps an init.d script would help. You can check the SMART attribute 193 of your drives, which tells you how many times the drive has parked the head in its life. You will see that this number is far greater on such "green drivers" than on normal drives. smartctl -a /dev/sdX | grep 193 Regards! -------- [1] http://forums.anandtech.com/showthread.php?t=2085685
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