How to add a new disk to a VG that has Strict allocation

[Todd McDaniel_1]

All:

First, let me say that I know it is strange to have /tmp outside of VG00. Please overlook that and help me with my question. Thanks.

I have a system with a mirrored VG01 as follows on an 8GB disk with a few extra unused extents, only 120 or so.

--- Distribution of physical volume ---
LV Name LE of LV PE for LV
/dev/vg01/swap1 1250 1250
/dev/vg01/tmp 500 500
/dev/vg01/home 75 75
/dev/vg01/localcw 225 225

My question is how can I permanently add a new 8GB disk to the VG01 and then extend the /tmp directory which has strict allocation?

I know that I can disable strict allocation with:
vgchanges -s n /dev/dsk/cXtXdX
,but what I have been told is that is only supposed to be a temp solution.

Thanks for your suggestions.

[Todd McDaniel_1]

Actually it should be lvchange -s n etc...

[Martin Johnson · Accepted solution]

If I remember correctly the strict policy has to do with putting mirror copies on the same disk. It has nothing to do with extending a logical volume on to a second disk.

You should be able to vgextend and lvextend and extendfs with no problems.

HTH
Marty

[James R. Ferguson]

Hi Todd:

Strict allocation refers to mirrored logical extents that are allocated to share or not share the same physical volume or volume group.

In my option, there is little benefit to mirroring to the *same* physical volume, although it is allowed.

If I understand your question, you want to add only one disk. In that case, when you extend the filesystem, to where are you going to mirror the new extents?

Regards!

...JRF...

[Volker Borowski]

Hello,

I think you will not get trouble with "strict". May be you created the lvol for /tmp as "contiguous" this means the volume may not be divided in several sections on one disk, like you need it for swap.

If /tmp is contiguous, you can extend the volumegroup, lvmove the tmp-volume to the new disk and then extend it right afterwards, so the new LEs of the volume can be attached right to the end of it.

Hope this helps
Volker

[Todd McDaniel_1]

Thanks for all your help.

Yes I do have 2 disks to use 1 as a mirror. Also, I was getting strict confused with contiguous. I DON'T have contiguous only strict.

Also, I am not sure why HP allows for mirroring on the same disk that is a very bad policy and has no redeeming qualities!! :0

I have it now. Thanks again!