PVG Concept

[Cliff Lim Kok Hwee]

Gd Day Forum,

Currently, my existing system running HP-UX 11.00 has a volume group vg02 and all its logical volumes are equally striped across 6 harddisks.

Query: Correct me if I am wrong, if there is a need for additional space eg. due to a need to extend a filesystem, I will have to add in 6 new harddisks all together? Do I term this as extent based striping?

Query: Can the creation of PVG volume group help to eliminate the cons I mentioned above?

thanks n regards/cliff

[bhavin asokan]

hi,

pvg is used at the time of mirroring.if you are mirroring with two pvg ,it will make you sure that your filesystem is on one set of disks(1st PVG disks) and its mirror is on other set of disks(2nd pvg disks).
you can get information by searching itrc forum with keyword PVG.

see the following links

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=33822

http://forums1.itrc.hp.com/service/forums/parseCurl.do?CURL=%2Fcm%2FQuestionAnswer%2F1%2C%2C0x437142308663d611abdb0090277a778c%2C00.html&admit=716493758+1103344382044+28353475


regds,

[Cliff Lim Kok Hwee]

Hi Guys,

Query: Read the articles, does it mean that PVG is related to mirroring and does not have any relations to logical volume striping which I had mentioned?

Query: If that is the case, while creating a volume group of eg 4 harddisks/LUNs for logical volume striping which run on XP storage, do I need to check out the harddisks/LUNs information to verify whether that can be LV striped in a volume group?

I presume I dun think there is a need.

Thanks for the advise/cliff

[Phillip Renner]

The answer to the first question is yes, you need 6 more disks to extend a file system thats striped across 6 disks. As for PVG We use it for striping and mirroring var, opt and usr in vg00. it allows us to easily (maybe easier is the right word) stripe vg00 disks. I doubt that it helps us much but we need all the speed we can get. If you already have mirror-ux installed I wouldn't use PVG anywhere but in vg00..

[Cliff Lim Kok Hwee]

Gd Day Forum,

Correct my understanding based on your replies, if I have a PVG volume group and all its logical volumes are equally striped across 6 harddisks, and a need arises for additional space, do I also need to add in 6 harddisks?

Thanks n regards/cliff