Alexander Motin schrieb am 23.02.2010 17:18 (localtime): ...
I guess if it's a HDD firmware issue with NCQ the hang shouldn't happen when NCQ is disabled.Just for case of real I/O timeout, run full surface test with SMART.
Unfortunately I couldn't find new firmware from Samsung, although one drive shows version 1AG01113 while the other two have 1AG01118. But the timeout happened at different channels, so it's not one certain disk...
One understanding question: If the drive doesn't complete a command, regardless if it's due to a firmware bug, a disk surface error or whatever, is there no way for the driver to terminate the request and take the drive offline after some time? This would be a very important behaviour for me. It doesn't make sense building RAIDz storage when a failing drive hangs the complete machine, even if the system partitions are on a complete different SSD.
Btw, I found camcontrol cmd ada0 -a "EF 85 00 00 00 00 00 00 00 00 00 00" for disabling APM and another one for disabling AAM. I did that for my drives. Is there a wiki where we can place such valuable commands?Probably not. It is just ATA commands, taken from ATA specification, but definitely it is not very easy way.
Hmm, I saw some FreeBSD wikis, but I don't know if there's the _one_ official. I'll see if there's a possibility to leave some usefull hint's for such purposes.
Thanks, -Harry
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