How To Set Up Software RAID1 On A Running System... (CentOS 5

[icecold]

Hi,

I have read the tutorial and before actually doing this, I have a question how to handle the extended parition. My partitioning is as follow:

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       29396   236018947+  83  Linux
/dev/sda3           29397       29657     2096482+  83  Linux
/dev/sda4           29658       30401     5976180    5  Extended
/dev/sda5           29658       30401     5976148+  82  Linux swap / Solaris

I was thinking to copy the partion table and create md for sda1, sda2, sda3, sda5? And leave sda4 Extended as well as on /sdb4?

Thanks!

[falko]

Can you post your /etc/fstab and the output of

mount

?

[icecold]

Hi,

In the meantime I managed to get it all working, besides some minor issues. After the migration to RAID1, the rights on the /tmp has changed to 755 which caused some problems. Changing this back to 777 solved those issues.

Here's the output of some of the config files (for those interested):

/etc/fstab:

/dev/md1                /                       ext3    defaults        1 1
/dev/md2                /tmp                    ext3    defaults        1 2
/dev/md0                /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/md3                swap                    swap    defaults        0 0

mount:

/dev/md1 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/md2 on /tmp type ext3 (rw)
/dev/md0 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

fdisk -l:

Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   fd  Linux raid autodetect
/dev/sda2              14       29396   236018947+  fd  Linux raid autodetect
/dev/sda3           29397       29657     2096482+  fd  Linux raid autodetect
/dev/sda4           29658       30401     5976180    5  Extended
/dev/sda5           29658       30401     5976148+  fd  Linux raid autodetect

Disk /dev/sdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          13      104391   fd  Linux raid autodetect
/dev/sdb2              14       29396   236018947+  fd  Linux raid autodetect
/dev/sdb3           29397       29657     2096482+  fd  Linux raid autodetect
/dev/sdb4           29658       30401     5976180    5  Extended
/dev/sdb5           29658       30401     5976148+  fd  Linux raid autodetect

Disk /dev/md1: 241.6 GB, 241683333120 bytes
2 heads, 4 sectors/track, 59004720 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md1 doesn't contain a valid partition table

Disk /dev/md3: 6119 MB, 6119489536 bytes
2 heads, 4 sectors/track, 1494016 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md3 doesn't contain a valid partition table

Disk /dev/md2: 2146 MB, 2146697216 bytes
2 heads, 4 sectors/track, 524096 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md2 doesn't contain a valid partition table

Disk /dev/md0: 106 MB, 106823680 bytes
2 heads, 4 sectors/track, 26080 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md0 doesn't contain a valid partition table

cat /proc/mdstat:

Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
      104320 blocks [2/2] [UU]

md2 : active raid1 sdb3[1] sda3[0]
      2096384 blocks [2/2] [UU]

md3 : active raid1 sdb5[1] sda5[0]
      5976064 blocks [2/2] [UU]

md1 : active raid1 sdb2[1] sda2[0]
      236018880 blocks [2/2] [UU]

unused devices: <none>