> 3x 5 disk raid-z. 3 disk failures in the right scenario, 12TB storage > 2x 7 disk raid-z + hot spare. 2 disk failures in the right scenario, > 12TB storage > 1x 15 disk raid-z2. 2 disk failures, 13TB storage > 2x 7 disk raid-z2 + hot spare. 4 disk failures in the right scenario, > 10TB storage
If paranoid, use two RAIDz2 VDEVs and a spare. If not, use a single RAIDz2 or RAIDz3 VDEV with 14-15 drives and 1-2 spares. If you choose two VDEVs, replacing the drives in one of them with bigger ones as the pool grows will be more flexible, but may lead to badly balanced pools (although I just saw that fixed in Illumos/openindiana - dunno about s11ex, fbsd or other platforms). Personally, I'm a bit paranoid, and prefer to use smaller VDEVs. With 7 drives per VDEV in RAIDz2, and a spare, you may still have sufficient space for some time. If this isn't backed up somewhere else, I'd be a wee bit paranoid indeed :) Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 r...@karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
