[NBLUG/talk] Raid Help

[Walter Hansen]

System RH 8.0
  Dual SCSI 18GB drives in Raid 1 array (ID 0,1)

Drive 1 failed.

I noticed that drive 0 had problems as well by the IBM/Hatachi testing
program.

I removed drive 1 and sent it in. Got the factory replacement and
installed it.

Using fdisk I partitioned the drive the same as drive 0. Except I didn't
use the Win95 Ext'd (LBA) that redhat had apparantly set, instead using
the normal Extended partitiion.

I then used raidhotadd to re-construct the array.

Now I'm trying to remove Drive 0 to send it in for replacement and I've
found that it won't just boot on Drive 1. It hangs after the Beep before
loading Grub.

I did check and had forgot to set the boot partition on the new Drive 1,
so I set it and then re-booted with the same results.

I'm going to be looking into this myself today, but I thought someone
might know what was going on with this or be able to point me in the right
direction. I've included all the relavant files and information I can
think of below:

# mount
/dev/md1 on / type ext3 (rw)
none on /proc type proc (rw)
/dev/md0 on /boot type ext3 (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/md2 on /home type ext3 (rw)
none on /dev/shm type tmpfs (rw)
/dev/md3 on /tmp type ext3 (rw)
/dev/md4 on /usr type ext3 (rw)
/dev/md5 on /var type ext3 (rw)


Drive 0(fdisk):
Disk /dev/sda: 255 heads, 63 sectors, 2231 cylinders
Units = cylinders of 16065 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/sda1   *         1        13    104391   fd  Linux raid autodetect
/dev/sda2            14      1033   8193150   fd  Linux raid autodetect
/dev/sda3          1034      1288   2048287+  fd  Linux raid autodetect
/dev/sda4          1289      2231   7574647+   f  Win95 Ext'd (LBA)
/dev/sda5          1289      1415   1020096   fd  Linux raid autodetect
/dev/sda6          1416      1480    522081   fd  Linux raid autodetect
/dev/sda7          1481      1513    265041   fd  Linux raid autodetect
/dev/sda8          1514      1526    104391   fd  Linux raid autodetect

Drive 1(fdisk):
Disk /dev/sdb: 255 heads, 63 sectors, 2231 cylinders
Units = cylinders of 16065 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/sdb1   *         1        13    104391   fd  Linux raid autodetect
/dev/sdb2            14      1033   8193150   fd  Linux raid autodetect
/dev/sdb3          1034      1288   2048287+  fd  Linux raid autodetect
/dev/sdb4          1289      2231   7574647+   5  Extended
/dev/sdb5          1289      1415   1020096   fd  Linux raid autodetect
/dev/sdb6          1416      1480    522081   fd  Linux raid autodetect
/dev/sdb7          1481      1513    265041   fd  Linux raid autodetect
/dev/sdb8          1514      1526    104391   fd  Linux raid autodetect


# cat /etc/raidtab
raiddev             /dev/md1
raid-level                  1
nr-raid-disks               2
chunk-size                  64k
persistent-superblock       1
nr-spare-disks              0
    device          /dev/sda5
    raid-disk     0
    device          /dev/sdb5
    raid-disk     1
raiddev             /dev/md0
raid-level                  1
nr-raid-disks               2
chunk-size                  64k
persistent-superblock       1
nr-spare-disks              0
    device          /dev/sda1
    raid-disk     0
    device          /dev/sdb1
    raid-disk     1
raiddev             /dev/md2
raid-level                  1
nr-raid-disks               2
chunk-size                  64k
persistent-superblock       1
nr-spare-disks              0
    device          /dev/sda8
    raid-disk     0
    device          /dev/sdb8
    raid-disk     1
raiddev             /dev/md3
raid-level                  1
nr-raid-disks               2
chunk-size                  64k
persistent-superblock       1
nr-spare-disks              0
    device          /dev/sda6
    raid-disk     0
    device          /dev/sdb6
    raid-disk     1
raiddev             /dev/md4
raid-level                  1
nr-raid-disks               2
chunk-size                  64k
persistent-superblock       1
nr-spare-disks              0
    device          /dev/sda2
    raid-disk     0
    device          /dev/sdb2
    raid-disk     1
raiddev             /dev/md5
raid-level                  1
nr-raid-disks               2
chunk-size                  64k
persistent-superblock       1
nr-spare-disks              0
    device          /dev/sda3
    raid-disk     0
    device          /dev/sdb3
    raid-disk     1
raiddev             /dev/md6
raid-level                  1
nr-raid-disks               2
chunk-size                  64k
persistent-superblock       1
nr-spare-disks              0
    device          /dev/sda7
    raid-disk     0
    device          /dev/sdb7
    raid-disk     1

# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md0 : active raid1 sdb1[1] sda1[0]
      104320 blocks [2/2] [UU]

md4 : active raid1 sdb2[1] sda2[0]
      8193024 blocks [2/2] [UU]

md5 : active raid1 sdb3[1] sda3[0]
      2048192 blocks [2/2] [UU]

md1 : active raid1 sdb5[1] sda5[0]
      1020032 blocks [2/2] [UU]

md3 : active raid1 sdb6[1] sda6[0]
      521984 blocks [2/2] [UU]

md6 : active raid1 sdb7[1] sda7[0]
      264960 blocks [2/2] [UU]

md2 : active raid1 sdb8[1] sda8[0]
      104320 blocks [2/2] [UU]

unused devices: <none>