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

LVM question

Chris Fadrowski — Fri, 20 Jul 2007 09:16:46 GMT

i am trying to create a 400 gb lun from my IA64 11.23v2 unix server using LVM.

when i did the vgcreate i get this.. can someone tell me what the problem is? i don't see the kernel parameter that it may be asking me to change...

root@host:/>vgcreate vg22 /dev/dsk/ch7t1d4
Warning: Max_PE_per_PV for the volume group (65535) too small for this PV (102399).
Using only 65535 PEs from this physical volume.
Increased the number of physical extents per physical volume to 65535.
vgcreate: Volume group "/dev/vg22" could not be created:
VGRA for the disk is too big for the specified parameters. Increase the
extent size or decrease max_PVs/max_LVs and try again.

Re: LVM question

Torsten. — Fri, 20 Jul 2007 09:19:27 GMT

IMHO, the command is telling you exactly what you need to do.

see man vgcreate.

Re: LVM question

James R. Ferguson — Fri, 20 Jul 2007 09:23:03 GMT

Hi Chris:

The error is self-explanatory. The maximum number of EXTENTS is 65,535. You need to choose a *larger* value for the EXTENT SIZE to accomodate fully utilizing your disk.

See the manpages for 'vgcreate' and choose a larger value for '-s pe_size'.

Regards!

...JRF...

Re: LVM question

Chris Fadrowski — Fri, 20 Jul 2007 09:30:02 GMT

using the -s 8 worked. I have never seen this before. All luns created have been 100 gb. thanks.

Re: LVM question

Ninad_1 — Fri, 20 Jul 2007 09:41:05 GMT

Hi Chris,

There are basically 2 errors.
First error is telling you that using default values of PE Size = 4 MB (as you have not specified any) and your disk being 400 GB :(400*1024)/4 = 102399 Physical extents would be needed to be configured, whereas LVM has a limitation of being able to use only 65535 PEs.
Next error imdicates that the VGRA (Volume Group Reserved Area) is small for the configuration you are trying to use - (again using default value of PE size = 4MB) expecting the VGRA to store more number of extents information than it can.
Thus you need to specify the parameters in such a way that all limits are stuck to.
Try using PE Size = 8 MB or 16 MB [ or as you would prefer ] using parameter -s 8
or -s 16 while doinf a vgcreate.

Regards,
Ninad