topic Re: LVM Striping in Operating System - HP-UX

LVM Striping

Cliff Lim Kok Hwee — Mon, 07 Mar 2005 03:14:55 GMT

Gd Afternoon Forum,

Recently, I created a fileystem of size 5GB as follows:

- lvcreate –L 5120 -i 4 -I 64 /dev/vg06
- newfs –F vxfs –o largefiles /dev/vg06/rlvol1
- mount /dev/vg06/lvol1 /oracle/data01

Query: The lv is being striped across 4 hardisks each having strip size of 64KB. Am I able to increase the filesystem size if required?

Thanks/c

Re: LVM Striping

Henk Geurts — Mon, 07 Mar 2005 03:27:59 GMT

hi Cliff
use
vgdisplay and lvdisplay to check if there is space on each disk to exend the LV.
if there is i think the answer is yes.
regards.

Re: LVM Striping

Cliff Lim Kok Hwee — Mon, 07 Mar 2005 03:31:40 GMT

Sorry for not being specific.

No more space from the volume group and adding of new disks are required.

Can it be done as per my earlier query?

thanks/cliff

Re: LVM Striping

Sunil Sharma_1 — Mon, 07 Mar 2005 03:34:02 GMT

I don't think you can increase size by adding only one disk. You may need to add 4 disk.

Sunil

Re: LVM Striping

Cliff Lim Kok Hwee — Mon, 07 Mar 2005 03:36:46 GMT

Hi Forumers,

I understand i need to add 4 more new disks. But later can I still get the lv extended? If so how?

Thanks/cliff

Re: LVM Striping

Patrick Wallek — Mon, 07 Mar 2005 03:37:47 GMT

If you have enough space spread across ALL 4 disks, then yes you can extend the LV.

If 1 disk doesn't have enough space for some reason though, then you can't.

Re: LVM Striping

Cliff Lim Kok Hwee — Mon, 07 Mar 2005 03:43:33 GMT

Hi,

Understanding that the 4 are new disks. I will proceed to add into volume group. But who to get it the existing lv extended and also striping thru 4 new disks?

Thanks/cliff

Re: LVM Striping

Patrick Wallek — Mon, 07 Mar 2005 03:46:49 GMT

If you attempt to extend the existing LV it will automatically be striped across 4 disks since that is the way it was created.

Re: LVM Striping

Henk Geurts — Mon, 07 Mar 2005 03:48:25 GMT

Patrick is right .
disk space on all 4 disks required.
then extending is possible.
regards.

Re: LVM Striping

Cliff Lim Kok Hwee — Mon, 07 Mar 2005 03:58:31 GMT

Hi Forumers,

With the addition of 4 new hardisks added into the existing volume group 8 hardisks will be total.

And with the command lvextend â L 6144 /dev/vg06/lvol1, the 4 new disks will have the new space of (6144-5120)=>1024MB evenly striped across each of the 4 new disks AUTOMATICALY?

thanks/cl

Re: LVM Striping

Devender Khatana — Tue, 08 Mar 2005 00:46:13 GMT

Hi,

That is right if you are extending LV by 1 gb across 4 disks then 250MB will be allocated from each disk and rest of the space will be free and can be used for some other file systems.

And offcourse it will be equally stripped across all 4 disks.

HTH,
Devender

Re: LVM Striping

Cliff Lim Kok Hwee — Tue, 08 Mar 2005 00:51:15 GMT

Thanks for the update guys!

Re: LVM Striping

Jeff Lightner_1 — Tue, 08 Mar 2005 08:50:48 GMT

FYI: If you have any spare space on the original 4 disks it will allocate that first. If you desire not to use that for some reason you can specify the 4 new disks in the extend.