Anyone ever experience really bad performance when rebuilding a parity disk? We had a parity disk fail on our FAS940 and when it was trying to rebuild the disk i/o util went to 100% (observed with sysstat). Reads and Writes did not appear high, but I don't think rebuild traffic effects those numbers.
During this time, "ls" was taking between 30 and 60 seconds (unacceptable). We thought for sure this couldn't be normal, since we've had disks fail and rebuild many times. The difference this time is it was a parity disk, but I don't think that should make a difference other than taking a little longer to rebuild. Sure enough, after the rebuild was complete it started working again. Any opinions?
Jerry
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