On Fri, Aug 12, 2011 at 6:34 PM, Tom Tang <thomps...@supermicro.com> wrote: > Suppose I want to build a 100-drive storage system, wondering if there is any > disadvantages for me to setup 20 arrays of HW RAID0 (5 drives each), then > setup ZFS file system on these 20 virtual drives and configure them as RAIDZ?
A 20-device wide raidz is a bad idea. Making those devices from stripes just compounds the issue. The biggest problem is that resilvering would be a nightmare, and you're practically guaranteed to have additional failures or read errors while degraded. You would achieve better performance, error detection and recovery by using several top-level raidz. 20 x 5-disk raidz would give you very good read and write performance with decent resilver times and 20% overhead for redundancy. 10 x 10-disk raidz2 would give more protection, but a little less performance, and higher resilver times. -B -- Brandon High : bh...@freaks.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
