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size disk new to VG

 
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Eli Daniel
Super Advisor

size disk new to VG

good afternoon, I have a question:

now I have a vg with two 50 GB disk each. I need to add a new disk to vg. The new disk must be the same size of the other disk (50GB) or I can add a disk smaller or larger??
it affects?

Operation System HP-UX 11.23 64 bits
14 REPLIES
John Guster
Trusted Contributor
Solution

Re: size disk new to VG

you need check with vgdisplay -v vgXX to see Max PE per PV value, if it is limited to 50GB per PV, then you only can have max size of 50GB disk to be added; if you add a disk with size > 50GB, only 50 GB will be usable.
you can add disks smaller size than 50 GB. the number of disks to be added is limited by "Max PV" in the vgdisplay output. Good luck.
Eli Daniel
Super Advisor

Re: size disk new to VG

example:

vgQAECC:

Max PE per PV 43521
the disk assigned 55 GB

i cant add 1 disk 80 GB???
Eli Daniel
Super Advisor

Re: size disk new to VG

i dont understand
"Max PE limited to 50GB per PV"
Raj D.
Honored Contributor

Re: size disk new to VG

Daniel,

>I can add a disk smaller or larger??
>it affects?

- Yes, you can add any size of disk, smaller or larger than 50GB (smaller no problem, larger is limited to ( PE_Size * Max_PE_per_PV) value.





>vgQAECC:
>Max PE per PV 43521
# it will support #2720 PV size. with 64MB PE.


-in your case, Max PE per PV is 43521
check PE size as well:
# vgdisplay vgQAECC | grep "PE Size"

- if your PE size is 64, you can add a large disk , theoretically maximum 2720 GB.
Practically/usually the storage assigns lun size max 500GB or 1 TB, so in that case if you are planning to extend the VG with more than 50GB disk, you should be good.



Cheers,
Raj.
" If u think u can , If u think u cannot , - You are always Right . "
Raj D.
Honored Contributor

Re: size disk new to VG

Daniel,

>i cant add 1 disk 80 GB???

Yes, you can add 80GB disk.
Even smallest PE size VG will allow to add max 170GB disks.

43521*4
174084


Cheers,
Raj.
" If u think u can , If u think u cannot , - You are always Right . "
Raj D.
Honored Contributor

Re: size disk new to VG

Further Please post: #vgdisplay vgQAECC
" If u think u can , If u think u cannot , - You are always Right . "
Eli Daniel
Super Advisor

Re: size disk new to VG

SAPL905:/> vgdisplay vgQAECC | grep "PE Size"
PE Size (Mbytes) 4
atul2701
Frequent Advisor

Re: size disk new to VG

Raj smallest PE size for VG is 1Mb not 4Mb. 4 MB is the default size.
Atul
Atul Gupta
Eli Daniel
Super Advisor

Re: size disk new to VG

with PV 4 MB, I can add a 80GB disk??
R.O.
Esteemed Contributor

Re: size disk new to VG

"with PV 4 MB, I can add a 80GB disk??"

Yes, you can. You can add a disk up to 170Gb.

Regards,
"When you look into an abyss, the abyss also looks into you"
Eli Daniel
Super Advisor

Re: size disk new to VG

sorry for the question: because can add 1 disk 170 GB when PV = 4 MB???
Raj D.
Honored Contributor

Re: size disk new to VG

Yes, Daniel.
> when PV = 4 MB???

Correction: not PV, when PE Size = 4 MB.

Cheers,
Raj.

" If u think u can , If u think u cannot , - You are always Right . "
Raj D.
Honored Contributor

Re: size disk new to VG

Daniel,
Have a look at this document, things will be pretty clear :

1. HP-UX LVM Supported Limits. Whitepaper.
( Attached. 119KB)

Enjoy, Have fun!,
Raj.
" If u think u can , If u think u cannot , - You are always Right . "
Eli Daniel
Super Advisor

Re: size disk new to VG

Thanks