+------------------------------------------------------------------------------ | On 2010-02-20 08:12:53, Charles Hedrick wrote: | | We recently moved a Mysql database from NFS (Netapp) to a local disk array (J4200 with SAS disks). Shortly after moving production, the system effectively hung. CPU was at 100%, and one disk drive was at 100%.
If one disk is stuck at 100% busy, constantly, it usually means that disk is dying, dead, or there's a problem with its backplane. Check sw/hw/trn errors with iostat. Check fmdump. See zpool status -v for chksum errors. Did you test the disks before deploying? A 12 way mirror and filebench/bonnie++/iozone is a nice way to quickly stress them. A hung disk can affect system performance in extremely obnoxious ways. Offline the disk and see if performance improves. Depending on the driver this can take many minutes. (May be faster to just pull the disk and let the kernel notice it's actually really gone instead of just maybe not talking anymore.) -- bda cyberpunk is dead. long live cyberpunk. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
