[linux-audio-user] Raid setup (kinda OT)

Eric Dantan Rzewnicki rzewnickie at rfa.org
Thu Mar 27 11:04:00 EST 2003

I haven't used raid on an audio box ... but for many of our servers we
are using mirrored raids (RAID1) for the system disks. For what it's
worth and without saying anything about whether or not this is
appropriate for your situation, attached is the cheat sheet I use to
remind myself of what I need to do when setting these up.

but the mdadm debian package mentioned in this thread might make my
notes obsolete. :)

On Wed 26/03/2003 13:18:43, Bryan Koschmann - GKT wrote:
> Hello,
> While I know this is specfically an audio group, I'm thinking this is
> still related, but I apologize if it is too far off topic.
> I was wondering if anyone here has setup an IDE raid, either via hardware
> or software. I ask because I know it usually would speed up disk access
> which is good for realtime audio work (I had to work on a scsi system with
> a layla for a customer of mine). I was looking at doing a striped raid
> with 2 80 gigs (or maybe 2 120s).
> I tried to setup a striping (then later a mirror) on my other machine
> running slack 8.0 but had absolutely no luck whatsoever. Neither the
> hardware on my motherboard (HPT370 on abit VP6) or just a simple software
> raid worked. I will probably be using the same board for audio recording
> unless someone has a better suggestion (looking at asus).
> So, if anyone can give me any recommendations or hints/tips I would be
> quite happy. :)
> Thanks in advance,
> 	Bryan
-------------- next part --------------
### refer to Boot+Root+Raid+LILO-mini-HOWTO, Software-RAID HOWTO
### This micro-HOWTO assumes 1 swap and 1 main partition on each disk
compile & install kernel with RAID support
install raidtools2
install identical 2nd disc
partition to match existing disk
	- may require some tinkering if disk geometries are different
	- root/boot partition(s) should be type "fd" for raid autostart
mkswap {swap partition}
create or copy /etc/raidtab -- edit to suit
	- mark existing disk as failed so raid only uses the newdisk at first
mkraid /dev/md0
mke2fs (-j if ext3) /dev/md0
mount /dev/md0 /mnt/newdisk
telinit 1
cp -ax / /mnt/newdisk
edit /mnt/newdisk/etc/fstab
	- replace entries for root/boot partition with /dev/md0
	- make sure there are entries for swap on both devices 
make bootdisk
    cat /vmlinuz > /dev/fd0
    rdev /dev/fd0 /dev/md0
    rdev -r /dev/fd0 0
    rdev -R /dev/fd0 1
reboot from floppy
fdisk old disk to change root/boot partition to "fd" for raid autostart
edit /etc/raidtab to change failed-disk to raid-disk
raidhotadd /dev/md0 {original_partition}
    wait for reconstruction to finish
    watch -n 1 cat /proc/mdstat
edit /etc/lilo.conf
    boot = /dev/md0
    root = /dev/md0
    raid-extra-boot = /dev/hdc, /dev/hda
reboot from raid

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