topic Re: Lvextend question in Operating System - HP-UX

Lvextend question

MarkW_1 — Wed, 11 Aug 2004 11:24:48 GMT

Need some help with extending a couple of lvols. It seems that I have enough space but I get the following message:

The command used to extend logical volumes, /sbin/lvextend, has

failed. The stderr output from the command is shown below. The

Log logical volume has not been extended.

lvextend: Not enough free physical extents available.

Logical volume "/dev/vg07/ora12" could not be extended.

Failure possibly caused by strict allocation policy

Logical Volume: ora12

Volume Group: vg07

Space Available in Volume Group (Mbytes): 45992

Current Logical Volume Size (Mbytes): 10000

New Size (Mbytes): 20000

ora12 vg07 VxFS 10000 1 /ora12

ora13 vg07 VxFS 17000 1 /ora13

ora14 vg07 VxFS 20000 0 /ora14

ora15 vg07 VxFS 20000 0 /ora15

Re: Lvextend question

Pete Randall — Wed, 11 Aug 2004 11:29:38 GMT

Mark,

Do a "lvdisplay" on the logical volume and check the "Allocation" policy. It will probably say "strict/contiguous". If this is the case, the extents you're trying to add need to be contiguous to the existing ones. Probably the easiest way to fix this, is to use lvchange to alter the contiguous flag (-C) - assuming that the lvol doesn't really need to be contiguous, that is.

Pete

Re: Lvextend question

A. Clay Stephenson — Wed, 11 Aug 2004 11:36:11 GMT

Two things can cause this:

1) strict / contigious allocation policy has been set

2) The LVOL is mirrored and although there are enough free extents in total to grant the request, there are no enough free extents available on separate physical volumes (PV's) to allow each mirror to be housed on separate PV's.

Re: Lvextend question

Sundar_7 — Wed, 11 Aug 2004 11:40:31 GMT

Even though you have enough free space, ability to successfully extend LV also depends on the allocation policy.

Is your LV mirrored ?

If not, you can safely ignore "strict" allocation.

If your LV is neither mirrored nor is a extend based stripe, you can ignore the PVG-strict allocation.

Most probably your LV extend allocation is set to "contiguous"

# lvchange -C n /dev/vgXX/lvolXX

# lvextend .....