Replacing a disk in the LVM environment

Scenario:

In the LVM scenario, we want to replace hdisk2 in the volume group vioc_rootvg_1, which contains the LVs vioc_1_rootvg associated to vtscsi0. It has the following attributes:

 

 

 

> The virtual SCSI adapter on the virtual I/O server is vhost0.

 

On the VIO_Client:

1) # unmirrovg rootvg hdisk1 : Unmirror the failing disk.

2) # bosboot -ad /dev/hdisk0 : Create a bootimage on hdisk0.

3) # boolist -m both -o hdisk0 : Change the boot order.

4) # reducevg -d -f rootvg hdisk1 : Remove the failing disk from the rootvg

5) # rmdev -dl hdisk1 : Command to remove the disk from the machine.

Now the disk can be removed from the VIO_Server:

The "hdisk1" is presented at the VIO_Client as the logical volume of name "vioc_1_rootvg" that belongs to the volume group called "vioc_rootvg_1" that is made up of physical volume hdisk2 at the VIOS end.

Since the hdisk1 is the failed disk which has to be replace, which in turn refer to a logical volume at the VIOS. We need to remove the logical volume.

Note: The logical volume is associated with the Virtual Targer Device "vtscsi0" and mapped to the virtual client SCSI Adapter "vscsi1".

1) Login into VIOS_Sever as padmin.

2) $ lslv vioc_1_rootvg  : Make a note of the size of the LV (No.of LP/PP Counts).

3) $ rmdev -vtd vtscsi0 : Command to remove the Virtual Target Device.

4) $ rmlv -f  vioc_1_rootvg  : Command to remove the logical volume.

5) $ lsvg -lv vioc_rootvg_1 : Command to verify the logical volume has been remove from the volume group.

6) $ mklv -lv vioc_1_rootvg vioc_rootvg_1  32G: Command to recreate another logicalvolume of same size.

7) $ lslv vioc_1_rootvg  : Command to verify the logical volume has been created.

8) $ mkvdev -dev vioc_1_rootvg  -vadapter vhost0  : Mapping of the logical volume to the Virtual SCSI client adapter.

9) $ lsmap -vadapter vhost0 : Verify the mapping has been done successfully.

On the client:

1) # cfgmgr : Command to look for any new devices added.

2) # lspv : List the physical volumes. Look for the one in "None" state.

3) # extendvg rootvg hdisk# : Command to add the new disk to the rootvg.

4) # mirrorvg rootvg hdisk# : Command to mirror the rootvg to the newly added disk.

5) # lsvg -m rootvg  : Command to verify the rootvg is mirrored onto new disk.

6) # bosboot  -ad /dev/hdisk# : Create a boot image on the newly added disk.

7) # bootlist -m both -o hdisk# : Update the bootlist.

> The volume group on the virtual I/O client is rootvg.

> The virtual SCSI adapter on the virtual I/O client is vscsi1.

> The failing disk on the virtual I/O client is hdisk1.

> The virtual disk is LVM mirrored on the virtual I/O client.

> The size is 32 GB.