On Tue, Jan 17, 2006 at 07:12:57PM -0500, Kyle Moffett wrote:
> The most reliable RAID-5 you can build is a 3-drive system. For each
> byte of data, you have a half-byte of parity, meaning that half the
> data-space (not including the parity) can fail without data loss.
> I'm ignoring the issue of rotating parity drive for simplicity, but
> that only affects performance, not the algorithm. If you want any
> kind of _real_ reliability and speed, you should buy a couple good
> hardware RAID-5 units and mirror them in software.
Actually, the most reliable RAID-5 is a 2 drive system, where you have
a full byte of reduncancy for each byte of data. Two drive RAID-5
systems are usually called RAID-1, but if you write out the formulas it
becomes clear that RAID-1 is just a special case of RAID-5.
Erik
--
+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands
| Data lost? Stay calm and contact Harddisk-recovery.com
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