topic Lvcreate in Operating System - HP-UX

Lvcreate

Ashwin_4 — Wed, 21 Jan 2004 02:33:47 GMT

hi masters,
VG Name /dev/vgfa
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 7
Open LV 7
Max PV 16
Cur PV 2
Act PV 2
Max PE per PV 5624
VGDA 4
PE Size (Mbytes) 4
Total PE 11248
Alloc PE 9000
Free PE 2248

Above details of vg00 shows Free PE is 2248, With this maximum how big lv I can create.

Whatis the relation between PE And MB.

Thanks.

Re: Lvcreate

Hoefnix — Wed, 21 Jan 2004 02:38:52 GMT

It depends if you want the volume to be mirrored:
The maxsize should be:
Free PE* 4 MB
2248*4MB=8992

If its mirrored: 4496

Regards,

Peter

Re: Lvcreate

Hoefnix — Wed, 21 Jan 2004 02:43:21 GMT

Just more explns:

The PE are the Physical extends on the disk. (some way to devide your disk in pieces)

The PE size in your case is 4MB.
In this volumegroup the MAX PE per PhysicalVolume is 5624 so you can use disks of 5624*4MB=22.4GB in this volumegroup.

Regards,

Peter

Re: Lvcreate

KapilRaj — Wed, 21 Jan 2004 06:04:45 GMT

Do not go just by PE 's free ; If you have mirroring you will require 2 PE's to make one LE.

PE :- Physical Extend
LE :- Logical EXtend

Mirroring means , you have allocated 2 PE's for one LE So if you have 200 PE's free you can create an LV of 200/2 * PE Size.

man lvm

Regds,

Kaps

Re: Lvcreate

Hoefnix — Wed, 21 Jan 2004 06:10:21 GMT

Kaps,
see my first post:
If its mirrored: 4496

regards,

Peter

Re: Lvcreate

KapilRaj — Wed, 21 Jan 2004 09:39:20 GMT

sorry pete,

I missed it

Where is the requester ?

Kaps

Re: Lvcreate

Marton Ferenc — Thu, 22 Jan 2004 03:10:19 GMT

In this vg you have 2 disks, both of them have 5624 PE, 5624x4MB. So vg has 11248 Total PE (2x5624) and diskspace 11248*4MB.

Real space of the filesystem depends on lv usage (mirror etc...)