Can I assume you have data on sda1 and you want sdb1 to become a mirror? If
so then here's the problem. Creating a raid mirror destroys any existing
filesystem on the partitions involved. Further, mkraid can not make a raid
mirror out of any mounted partition. The correct strategy in your case
would be to copy your data off of sda1 to a safe place. Issue umount
/dev/sda1 (umount /dev/sdb1 if necessary.) And then do your mkraid
/dev/md0. Once the md0 mirror is made, run mkfs -t ext2 /dev/md0 (assuming
you want ext2), fsck -y -f /dev/md0 to make sure it's a healthy filesystem,
and then you can copy your data back onto it. By the way, once /dev/md0 is
made, don't fsck or mount the sda1 or sdb1 partitions unless you don't mind
losing data.
Good luck!
David Cunningham
----- Original Message -----
From: os390 ibmos <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, November 30, 1999 6:52 PM
Subject: Mirroring RAID 1 in REDHAT 6.0
> I am trying to implement mirroring RAID-2 for Redhat 6.0 ecommerce
> version. Kernel version is 2.2.5-15Smp (I have a dual celeron 366
> ABIT Motherboard).
>
> I have connected the two SCSI HDs 4.4G (IBM DDRS)on a Adaptec
> 2940 UW controller card (SCSI ID 6 & 10).
>
>
> I partitioned the HDs as sda1 => /home1 , sdb1 => /home2 .
>
> I want to mirror /home1 and /home2 .
>
>
> I added the following lines in /etc/conf.modules
>
> alias md-personality-3 raid1
> alias md-personality-4 raid5
>
> I have looked through the HOW-TOs
>
> http://www.linuxgazette.com/issue45/nielsen.html
>
> and created /etc/raidtab
>
> as follows
>
> raiddev /dev/md0
> raid-level 1
> nr-raid-disks 2
> nr-spare-disks 0
> chunk-size 4
> persistent-superblock 1
> device /dev/sda1
> raid-disk 0
> device /dev/sdb1
> raid-disk 1
>
> I then typed mkraid /dev/md0 it came up with the following
>
> handling MD device /dev/md0
> analyzing super-block
> disk 0: /dev/sda1, 4458006kB, raid superblock at 4457920kB
> /dev/sda1 is mounted
> mkraid: aborted
>
> Can somebody point me further from here ?? I am looking at the
> HOW-TOs and other web based doc.
>
> Thanks,
> ===
> arijit
>
>
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