> > At the moment, I'm hearing that using h/w raid under my zfs may be > >better for some workloads and the h/w hot spare would be nice to > >have across multiple raid groups, but the checksum capabilities in > >zfs are basically nullified with single/multiple h/w lun's > >resulting in "reduced protection." Therefore, it sounds like I > >should be strongly leaning towards not using the hardware raid in > >external disk arrays and use them like a JBOD.
> The big reasons for continuing to use hw raid is speed, in some cases, > and heterogeneous environments where you can't farm out non-raid > protected LUNs and raid protected LUNs from the same storage array. In > some cases the array will require a raid protection setting, like the > 99x0, before you can even start farming out storage. Just a data point -- I've had miserable luck with ZFS JBOD drives failing. They consistently wedge my machines (Ultra-45, E450, V880, using SATA, SCSI drives) when one of the drives fails. The system recovers okay and without data loss after a reboot, but a total drive failure (when a drive stops talking to the system) is not handled well. Therefore I would recommend a hardware raid for high-availability applications. Note, it's not clear that this is a ZFS problem. I suspect it's a solaris or hardware controller or driver problem, so this may not be an issue if you find a controller that doesn't freak on a drive failure. BP -- [EMAIL PROTECTED] _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
