The answer: 1 disk of space is used for parity on RAID5 (or RAID3)
The more disks, the less 'waste'. In this case, I'll have 12GB
is usable space. This about what I suspected. Having looked
at this futher, I'll probably through an extra disk or
two in the RAID for expansion.
> I am looking at building a RAID5 system using 4x4GB disks,
> with a 5th disk as a hot spare. The data will be a mixture
> of source files and binaries, typical GNU stuff, sun compilers,
> mostly RO systems. Out of the 16GB of total space, how much is
> used for parity storage?
Thanks to everyone who replied:
john heasley <heas@teleport.com>
Carlos Enrique Ungo <cungo@avatar.pty.com>
"Bushman, Gonzo" <BUSHMAN@comswsys.tinkernet.af.mil>
geert.devos@ping.be (Geert Devos)
Matthew Stier - Imonics Corporation <matthew.stier@imonics.com>
Ronnie Altit <raltit@csfb.co.jp>
jeffw@smoe.org (Jeff Wasilko)
nobroin@esoc.esa.de (Niall O Broin - Gray Wizard)
Dougal Scott <dwagon@aaii.oz.au>
Jeff Fisher <jeff@kcrg.com>
Andi Paton <apaton@wtl1.demon.co.uk>
-b
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