Messages in this thread |  | | From | Leif Sawyer <> | Subject | Raid 1 Issues | Date | Fri, 13 Sep 2002 15:41:28 -0800 |
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I'm running 2.4.18, and trying to use Raid-1.
I created /etc/raidtab according to the instructions. raiddev /dev/md0 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 device /dev/hdc2 raid-disk 0 device /dev/hdb2 raid-disk 1
Next, I performed a raidsetup on my new disk (/dev/hdc2), and restarted. I was able to mount my new md0 with a single disk.
I then migrated all my data onto that new md0 and removed the old disk (/dev/hdbX) from /etc/fstab. I changed fstab to mount /dev/md0 as /usr and shutdown.
I removed the old /dev/hdb, and installed the new drive, a duplicate model of /dev/hdc, and restarted. I have no problems accessing /usr at this point, mounted from /dev/md0.
I partitioned /dev/hdb to be exactly like /dev/hdc, and formatted it as ext3. I then used raidhotadd /dev/md0 /dev/hdb2 to try and add the new partition to my mirror.
"cat /proc/mdstat" shows the the devices connected, but not attached:
Personalities : [raid1] read_ahead 1024 sectors md0 : active raid1 ide/host0/bus0/target1/lun0/part2[1] ide/host0/bus1/target0/lun0/part2[0] 77914752 blocks [1/1] [U] unused devices: <none>
I waited for a while, installed some software, and then looked at /proc/interrupts: root@hedwig:~> cat /proc/interrupts CPU0 0: 14635352 XT-PIC timer 14: 581245 XT-PIC ide0 15: 1341378 XT-PIC ide1
I have 2 disks on ide0,( / and /dev/hdb2), 2 disks on ide1 (/dev/hdc2 and /dev/cdrom)
The difference in interrupts is really significant when moving data around. ide0 doesn't increment at the rate that ide1 does (nowhere close!) when accessing /dev/md0 (mounted on /usr)
if I raidhotremove /dev/md0 /dev/hdb2, and then mount /dev/hdb2, there is nothing on the disk.
I've consulted the how-to without any success.
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