LVM Striping

[Cliff Lim Kok Hwee]

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

[Henk Geurts]

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.

[Cliff Lim Kok Hwee]

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

[Sunil Sharma_1]

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

Sunil

[Cliff Lim Kok Hwee]

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

[Patrick Wallek]

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.

[Cliff Lim Kok Hwee]

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

[Patrick Wallek]

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

[Henk Geurts]

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

[Cliff Lim Kok Hwee]

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

[Devender Khatana · Accepted solution]

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

[Cliff Lim Kok Hwee]

Thanks for the update guys!

[Jeff Lightner_1]

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.