At 15:43 04.03.00, you wrote:
>3 disks scsi
>
>--> 3 partion ext2 in Raid 5 (mounted on / ) of 4081mb [md0]
>--> 3 partition swap in Raid 5 of 250mb [md1]
>
>it's possible and it is performing?
Almost - you can't boot off a raid5; however, you CAN boot off raid1. Also,
I wouldn't use raid5 for swap - raid5 gives bad performance for many small
updates (which you'll probably have with swap. Onlöy reason for swap on
raid is redundancy, I'd sugest the followin configuration:
--> 3 partition ext2 in Raid 1 (mounted on /boot), size 3x20 MB
--> 3 partition ext2 in Raid 5 (mounted on /),
--> 3 partition swap in Raid 1
You'll need to use the raid-enabled lilo provided by redhat 6.1 or patch
your lilo sources to enable it to boot off raid1 (patch at
ftp://ftp.sime.com/pub/linux/lilo.raid1.gz).
The one thing you must be careful about is swap on raid: you MUST NOT have
swap active on a raid device WHILE it's RESYNCHRONIZING. So, you should
remove swapon -a from your startup files and instead insert a script that
waits for resync to finish before turning on swap. Put the script right
behind mounting the other filesystems & proc - it needs to read
/proc/mdstat to get status of raiddevices and /var/log to write status
messages. Important - let the script run in the background, it might have
to wait quite a long time if you've got many big raid devices).
Here's the raidswapon script I'm using (slightly adapted from a script
posted on the list - sorry, I don't remember the original author):
---------------------------------------
#!/bin/sh
# start swap on raid devices
RAIDDEVS=`grep swap /etc/fstab | grep /dev/md|cut -d" " -f1|cut -d/ -f3`
for raiddev in $RAIDDEVS
do
while grep $raiddev /proc/mdstat | grep -q "resync="
do
echo "`date`: $raiddev resyncing" >> /var/log/raidswap-status
sleep 20
done
/sbin/swapon /dev/$raiddev
done
exit 0
---------------------------------------
Bye, Martin
"you have moved your mouse, please reboot to make this change take effect"
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