On Jan 14, 2009, at 10:50 AM, Eric Sproul wrote: > Hi, > I'm looking for a recommendation for the vdev layout of a storage > server that > has 6 1TB SAS drives. I need 4TB of usable space, which I can get > one of 2 > ways: 1 raidz2 vdev or 2 raidz1 vdevs. Reading best practices, > blogs and this > list, I understand that having more top-level vdevs is good for > IOPS, but I > wonder how that balances against the likelihood of 2 disk failures > occurring in > the same vdev in the second case, which would cause total data > loss. The first > case would permit *any* 2 disks to fail, which would reduce the > overall risk. > > Basically, my question to those more seasoned in the field is > whether the extra > vdev will yield enough improvement to make it worthwhile to take on > the > increased risk of data loss?
How many controllers are those 6 disks spread across? At any rate, I would lean towards the z2 configuration considering the number of drives involved. /dale _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
