Good!

You do not need to test that. Adding a disk to a VG means formatting it, so the system will tell you if the disk is faulty. Do the following to add a new disk to a VG:

Code:

extendvg <vgname> <hdisk-device>

If everything goes well there is no output at all, otherwise diagnostic messages will appear.

Notice that a physical volume (a "disk" in LVM speak) can only contain 1018 PPs in an ordinary VG. This means that because of your PP size of 128M (see lsvg vg_usr1 output) you can only add disks up to somewhat below 128G in size. If your hdisk42 is bigger than this you need to introduce a "factor". This means the usual limit of 32 PVs each 1018 PPs in size is divided/multiplied by this factor: a factor of 2 means that only 16 PVs can be used but each PV can hold 2036 PPs. You change the factor by:

Code:

chvg -t <factor> <vgname>

Not quite. You were able to remove the bad disks because you still had one good copy of every LP. Logical volumes (LVs) consist of "logical partitions" (LP) which are in turn made of "PPs" (physical partitions). PPs are parts of a disk. If you create an unmirrored LV you assign one PP to each LP the LV consists of. Creating a mirrored LV means assigning 2 PPs to every LP and writing data to these two different (disk) locations in parallel.

After adding the new disk you might want to remirror the VG. First find out which LVs are affected. Here is an example:

Code:

# lsvg -l myvg
myvg:
LV NAME             TYPE       LPs     PPs    PVs    LV STATE      MOUNT POINT
mirrorlv            jfs2       80      160      2    open/syncd    /some/where
loglv04             jfs2log     1       1       1    open/syncd    N/A
nomirrorlv          jfs2        3       3       1    open/syncd    /else/where

The first LV is mirrored, the second is not and the jfslog LV is not mirrored too. Use the mklvcopy command to create mirror copies of unmirrored LVs. You could use the mirrorvg to do that but only if hdisk42 offers the same or more space as the missing disks together, because you do not have any space reserves in your VG (see "free PPs" in the lsvg output).

I hope this helps.

bakunin