Raid 5 on a Rack Mount Dual 1ghz power pc G4?

[eniac]

I don't belive raid 5 is in OS X server yet.   I'm not impressed anyhow. 
 I've been running raid at work with OS X for about 8 months, and to be 
perfectly honest, I don't feel in control of the arrays.  I have an 
xserve with 4 120GB drives in her.  I've had 2 arrays of 2 disks apiece, 
with 1 volume holding the OS, and the other volume acting as the active 
service storage (http, ftp, file sharing...whatever).  Right now I'v got 
currently running a RAID 0 of 3 disks giving me a ton of unsafe but 
usable space, and the OS installed on a partition of the other 120.
I've had several incidents where the application of a software update 
causes one of the disks to fall off the array in the RAID 1 config. 
 I've never had data loss, but one of the two drive decieded to not come 
up on boot.  A resyncing of the array was nessesary.  This has happened 
twice with the RAID 1 configuration.   The current RAID 0 seems much 
more robust and capable, but its just big, not safe.  

do it on linux, here's the howto
http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html

Software RAID under linux (I've had experience with RAID 1 and RAID 5 
under 2.4.x) is very nice.  It is feature-full to say the least, easy to 
get statuses and check on things, and ts reliable hell.  I've done flat 
out stupid things to test it like 'cat /dev/urandom > /dev/hdg'  to one 
disk element of the raid set while writing data to the filesystem that 
is provided by that same set, pulling drives at the wrong times (mid 
filesystem writes), and then checksumming the files.   All of the above 
testing was done on a G4 with 3 120GBs, on a ydl 2.3 box.

Here is the howto.  PPC doesn't change the gamemuch, but you may have to 
recompile with RAID options, I dont' know if YDL ships with this 
compiled in.
http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html

Nicholas Kirlew wrote:

>Hello All,
>New to getting Linux going on the mac hardware. We would like to use the
>rackmount G4 as a file server running Linux.
>We have got a test version YDL going, and learnt some about video modes in
>the process.
>What we would like to do is a raid 5, I have a sneaky suspicion that the G4
>won't raid 5 even under OS 10.2.6. Any suggecstions or links gratefully rec
>so we can read up on the topic.
>
>-
>Regards,
>Nick Kirlew
>Network Manager
>NTOEC
>08 8922 2174
>
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