How we calculating the disk space approached by LVM

[gany59]

how can we calculate there is a free space in disk approached by LVM , what is lv extent,PV extent,VG extent..please help me

[James R. Ferguson]

Hi:

A 'vgdisplay' of the volume group will show you the physical extent size as 'PE Size (Mbytes)'. This is your fundamental physical/logical extent size. The 'Free PE' is the number you have available within the volume group.

Regards!

...JRF...

[Michael Steele_2 · Accepted solution]

Hi

By Volume Group

vgdisplay

Note Free PE
Note PE Size in MB
Note Used PE

(free pe)*(PE Size)=Total Free MB
(used PE)*(PE Size)=Total Used MB

By Physical Volume or disk

pvdisplay /dev/rmt/c#t#d0

Same as above

By system

Same as above but also
SAM > Disks > will report for you unused PV's and size

[Steven E. Protter]

Shalom,

There are two general areas to think of.

Volume group planning. How many disks or LUNS will you need, what kind of capacity for THIS volume group will need to carry. Simply setting the -p number of physical disks or -s size of the extent in a vgcreate statement has large impact on eventual disk capacity.

Free space information is presented by vgdisplay for volume groups and pvdisplay for disks.

Source materials:
http://docs.hp.com/en/7161/LVM_OLR_whitepaper.pdf

Glossary:
http://docs.hp.com/en/5992-4589/go01.html

SEP

[gany59]

what about logical volume

[Steven E. Protter]

Shalom,

As noted, a logical volume is a division of a volume group in which you store data.

Glossary:
http://docs.hp.com/en/5992-4589/go01.html

Definitions are in the glossary.


SEP

[James R. Ferguson]

Hi (again):

What part of my original answer didn't help you? This is basic math in a word problem.

...JRF...