topic Re: lvextend error in Operating System - HP-UX

lvextend error

Michael Dalanek — Mon, 26 Mar 2001 11:40:04 GMT

Hi admin,

when I try to extend this lvol I get an error. I know there is enough space to mirror it though;

lvextend: Not enough free physical extents available.
Logical volume "/dev/vg00/lvol14" could not be extended.
Failure possibly caused by strict allocation policy

Re: lvextend error

Vincenzo Restuccia — Mon, 26 Mar 2001 11:44:43 GMT

vgdisplay -v for see free PE,solution add a other disk with vgextend.

Re: lvextend error

Andreas Voss — Mon, 26 Mar 2001 11:46:16 GMT

Hi,

have you checked the 'Free PE' of output from vgdisplay vg00 ?
Perhaps you have used wrong option ie:
lvextend -l 500 (extend to 500 PE = 2GB when PE Size=4MB)
lvextend -L 500 (extend to 500MB)

Regards

Re: lvextend error

Edward Sedgemore — Mon, 26 Mar 2001 11:52:00 GMT

lvol14 for vg00 is a high number, is this for swap space ?

If so then you are trying to create the mirror of an lvol which must be contiguous therefore enough free space is not sufficient, it must be contiguous space.

Re: lvextend error

Michael Dalanek — Mon, 26 Mar 2001 12:08:12 GMT

Yes, this lvol is for swap space. I know there are enough free extents to mirror it from vgdisplay so how can I create contiguous space ?

Re: lvextend error

Bill McNAMARA_1 — Mon, 26 Mar 2001 12:15:31 GMT

For swap
you must use an lvextend -m 1 -C y -r n /dev/vgXY/lvolXYZ /dev/dsk/cXtYdZ
C = Contiguous
r = Bad Block Relocation
m = mirror option
dsk = optional to specify PV in the VG
otherwise wherever contig. space is found

As was mentioned before check your extent status with vgdisplay and pvdisplay to see if you've got free contiguous extents on that PV.

Re: lvextend error

Philip Chan_1 — Mon, 26 Mar 2001 12:15:39 GMT

Hi Michael,

Swap partitions are required to be contiguous, that mean one straight big trunk of consecutive blocks. Your volume group may have enough space for the size specified, but they are spreaded over the volume group, that was the reason why the lvextend command being rejected by the OS.

~Philip

Re: lvextend error

Edward Sedgemore — Mon, 26 Mar 2001 12:26:47 GMT

Still nobody has come up with the way to create some contiguous space.

Options;

1. Do you have enough free extents on more than 1 disk in the volume group that lvol14 is not on ? If so, try extending explicitly to that disk by doing;
lvextend -m 1 /dev/vg00/lvol14 /dev/dsk/cxxxxxx

2. If possible, add in another disk to the volume group first, then use the explicit lvextend command above to extend the mirror on the new disk, as a new disk will always be contiguous when first added.

3. If possible find an lvol which has enough extents for you to create your mirror on and move it using the pvmove command to another disk. You shouldnt move lvols 1-8 on vg00.
Once youve pvmoved it to another disk you should have sufficient contiguous space to extend lvol14 to this disk.

Good luck.

Re: lvextend error

Bill McNAMARA_1 — Mon, 26 Mar 2001 15:18:12 GMT

oops, the -C y -r n is for the lvcreate not the lvextend. Have to clarify before I get flamed!
In any case, good answer above..

Bill