Maybe this belongs in zfs-discuss, but I thought this would be interesting to those on this list.
I'm trying to figure out some formulas for calculating bare metal storage needed to meet a usable storage volume goal. So far, my efforts have concentrated on calculating the usable/bare metal ratio for an 8-disk array configured for raidz2 with 1 hot spare (7 disks in the pool, 1 spare). For 8 500GB disks I got a pool of 3.16TB. >From this I calculated that roughly 79% of my bare metal capacity is available >with raidz2 and a hot spare. So, I'm thinking my multiplier should be Required Usable Storage * 1.21 In other words, (RUS)1.21=BMS Where RUS is Required Usable Storage and BMS is Bare Metal Storage. Do these numbers make sense? Has anyone done anything similar with raidz (rather than raidz2)? cheers, blake This message posted from opensolaris.org _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
