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Re: RAID

On 2 Mar 2000, at 16:36, Steve Tickle wrote:

> It occurred to me that as the amount of data we want to back up could 
> increase dramatically we could consider RAID.
> My question is, what software RAID systems exist for linux, what's involved 
> and how much of a pain are they to set up?

RAID support is in the kernel source - you need to either compile a kernel 
with support, or check to see if the module (md.o, IIRC) exists on your 
system.  You can't boot from an md device unless you're *really* keen on 
hacking low-level stuff, but you could put all of your data partitions on a 
RAIDset.  I haven't actually worked with it, though... I've only ever had 
hardware RAID to deal with.  Doing RAID-5 in software means a performance 
hit... lots of parity calculations going on.

You might also want to look at journalling filesystems - ext3 is probably a 
bit raw at the moment, but ReiserFS is supposed to be coming along quite 
nicely.  They were hoping to get it into the 2.4 kernel, but I don't think 
that's going to happen.

Cheers

R

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