Hi all, I have a little question. WIth RAID-Z rules, what is the true usable disks space? Is there a calcul like any RAID (ex. RAID5 = nb of disks - 1 for parity)? Thank you for your help, i found everywhere on the web and i don''t found my answer... -- This message posted from opensolaris.org
On Mon, Oct 20, 2008 at 11:32 AM, William Saadi <william.saadi at avnet.com>wrote:> Hi all, > > I have a little question. > WIth RAID-Z rules, what is the true usable disks space? > Is there a calcul like any RAID (ex. RAID5 = nb of disks - 1 for parity)? > ># of disks - 1 for parity -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20081020/552de7a2/attachment.html>
William Saadi wrote:> Hi all, > > I have a little question. > WIth RAID-Z rules, what is the true usable disks space? >It depends on what data you write to it, how the writes are done, and what compression or redundancy parameters are set.> Is there a calcul like any RAID (ex. RAID5 = nb of disks - 1 for parity)? >In general, by default, yes, this will work. raidz approximates raid-5, raidz2 approximates raid-6. -- richard