topic Re: Error creating VG in Operating System - HP-UX

Error creating VG

Carlos Vanegas — Thu, 19 Jun 2003 13:10:12 GMT

I want to create a VGxx in my server, but when I assigned the name and select the disk (253530), received the next messages:

vgcreate: Volume group "/dev/vgid2" 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. What parameter I need to increase in kernel??

Thanks.

Re: Error creating VG

Massimo Bianchi — Thu, 19 Jun 2003 13:12:32 GMT

Hi, no kernel parameter, but vgcreate parameter.

if you don't specify, you use a PE of 4 M

you may try with a PE size of 16M

see "man vgcreate" for the details.

HTH,
Massimo

Re: Error creating VG

Stuart Abramson_2 — Thu, 19 Jun 2003 13:14:49 GMT

Let's see the commands you used with error message.

Re: Error creating VG

James R. Ferguson — Thu, 19 Jun 2003 13:15:17 GMT

Hi Carlos:

There is no kernel parameter to change. As the message indictes you need to modify the 'max_pe', 'pe_size', 'max_pv' and/or 'max_lv' to create a smaller LVM header which will fit in one physical extent.

The most likely parameter to change is the 'pe_size'. Enlarge it. See the man pages for 'vgcreate' for more details.

Regards!

...JRF...

Re: Error creating VG

Jairo Campana — Thu, 19 Jun 2003 16:13:13 GMT

Usually, if you set up a new volume group without any command line switches, the default physical extent size (pe_size=4MB) is used. pe_size can be in the range 1 to 256MB. pe_size must be equal to a power of 2 (1, 2, 4, 8, etc.). The default value for maximal physical extents (max_pe) is 1016.

However, if the size of any physical volume exceeds 1016 times the pe_size, the default value for max_pe is adjusted automatically to match the physical volume size. The maximum number of physical extents can be a value in the range 1 to 65535.

This automatic procedure does not work, if you manually set the pe_size, e.g.:

# vgcreate -s 8 vgXY /dev/dsk/cCtTdD

In this example the vgcreate only works with disks smaller or equal than 8128 MB (1016 times 8MB).

If you want to use larger disks you have also to apply the max_pe value, e.g. for a 64GB disk:

# vgcreate -s 8 -e 8192 vgXY /dev/dsk/cCtTdD

NOTE: Plan these values carefully, thinking of the largest disk you want to use in the future. You cannot change pe_size and max_pe, resp., for an existing volume group.

Re: Error creating VG

Caesar_3 — Thu, 19 Jun 2003 20:12:49 GMT

Hello!

Intresting what size of your disk?
No it's not kernel, it's VG creation parms.

You must change the PE size when you
create PE (make it bigger 16-32 depend)

You can also try to use SAM and see what
size he will choose.

Caesar