How to extend Linear RAID device

How to extend Linear RAID

 

Hello All,

 

* Please do not try this on Production server. Make sure you can do this or not:)Read More

 

 Most of all you know that we use linear just like LVM.

 This is my server ...little small though:(

 

raiddev                 /dev/md0
raid-level              linear    # it's not obvious but this *must* be
persistent-superblock   1    # set this to 1 if you want autostart,
chunk-size              32
nr-raid-disks           2
device                  /dev/hdc3
raid-disk               0
device                  /dev/hda4
raid-disk               1

 

# Sample raid-1 configuration
raiddev                 /dev/md2
raid-level              0
nr-raid-disks           2
chunk-size              4

 

device                  /dev/hdc2
raid-disk               0

 

device                  /dev/hda3

raid-disk                1

Last week this RAID partition got full...suddenly i got mail from boss..:D

That wasnt much funny though.

So I have following procedures and belive me it works..

 

1. Unmount the raid partition

 

2. Stop the raid....raidstop /dev/md0

 

3. Update your /etc/raidtab file ...i have added new partition into it

device        /dev/hdb1

raid-disk    2

 

2. Dont forget to change nr-raid-disk line.

 

3. Now give the command

mkraid /dev/md0

 

It will create a raid array..you can see the 3rd partition is added into a raid array

cat /proc/mdstat

 

But after this all procedure you have run one more command

resize2fs /dev/md0

 

Now after mounting that partition you will get know you can successfully extended the RAID partition.