Hi Stephen, Ed,
> Yes. Red Hat Linux has offered software RAID for a few years.
I do miss a choice of the parity algorithm for RAID 5 in the installer
though. Not sure if that was added in 7.2.
> > Can I make 4 (four) partitions in the same hard disc and intall RAID 0 and
> > RAID 1 to it. Where can I find relevant documentation ?
>
> RAID 0 on the same disk is not recommended since you'll just be causing
> a lot of extra head movement for negative gain. Ditto with RAID 1 -
> although you might be able to recover your data if you have a bad spot
> on the media, if the head crashes, you're still out of luck.
The use of RAID 0 with stripes on a single disk is pointless. You want to
stripe to gain performance. But if you use stripes on a single disk you will
probably even loose some performance due to the overhead. Even the use of
separate disks on the same controller is discouraged for IDE. You should use
two disks on separate controllers.
RAID 1 is used where redundancy is needed. Even if you use two disks on
separate controllers the RAID 1 array will probably be somewhat slower than a
single disk for writing. Read speed might be somewhat increased if you choose
the right stripe size. When using two partitions on one disk you can expect
the write speed to drop to half that of a single partition, because everything
has to be written to two partitions. And if you are lucky read speed does not
drop far below that of a single partition. You will have some redundancy this
way, but it is useless if the disk fails.
Really, if you want to build a RAID system you should go with two disks on
separate controllers at least.
Bye,
Leonard.
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