[CentOS] RAIDs and JBOD?
John R Pierce
pierce at hogranch.com
Wed Nov 11 00:30:44 UTC 2009
Robert Heller wrote:
> No. You can use as many disks as you like for RAID 5. The 'parity' is
> not actually 1 bit. The capacity of a N disk RAID 5 (where N >= 3), is
> (N-1)*sizeof(one disk).
within reason. Its usually not a good idea to make a single raid5 set
much over 7-8 disks as the repair time becomes brutal, and the
performance degradation after a single drive failure is extreme. For
very large numbers of drives, build multiple raid5 sets and stripe them
(raid 0+5 sometimes called raid 50).
I will say again, I really prefer mirroring and raid 10/0+1 ... disks
are cheap, data loss and/or downtime is expensive.
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