topic Re: max lvol size in Operating System - HP-UX

max lvol size

Eli_pok — Thu, 05 Oct 2006 09:36:03 GMT

Hi,
I ran into a problem increasing a lvol over 250 giga.
I looked in the man and it was spesified that the max size is a 65535 logical extends per lvol, we use a 4 mbyte logical extent as default.
I'm sure the max size per lvol is much larger then 250 giga. How can I increase the lvol size over 250 giga????
Thanks

Re: max lvol size

Michal Toth — Thu, 05 Oct 2006 09:40:50 GMT

well, that's true:

65535*4MB equals roughly 250GB,

you have to migrate your data to a new vg with larger PE, also make sure to set the vg parameters correctly (plan ahead)

Re: max lvol size

IT_2007 — Thu, 05 Oct 2006 09:43:57 GMT

Also see man page for lvcreate

-L lv_size Allocate space to the logical volume,
specified in megabytes. lv_size is a
decimal value in the range 1 to 16777216
(the implementation limit). lv_size is
rounded up to the nearest multiple of
the logical extent size, equivalent to
the physical extent size defined for the
volume group by the vgcreate command
(see vgcreate(1M)). The default is
described above.

Either the -l or the -L option can be
specified, but not both.

It has range max. to 16777216 in decimals. You can't go beyond that value. As said in the above post, your value comes to nearly 250GB. Or increase PE size to get bigger logical volumes.

Re: max lvol size

Robert-Jan Goossens_1 — Thu, 05 Oct 2006 09:44:18 GMT

Hi,

Recreate your volume group with a larger PE size. (use the vgcreate -s option)

max_extends X PE_size = max_size_fs

65535 X 4 = 262152 MB

65535 X 16 = 1048560 MB = =/- 1 TB

Regards,
Robert-Jan

Re: max lvol size

Pete Randall — Thu, 05 Oct 2006 09:45:32 GMT

Michael is correct you're going to need to re-create. For reference purposes, here are the file and file system size limitations:

http://www.docs.hp.com/en/5971-2383/5971-2383.pdf

Pete

Re: max lvol size

Steven E. Protter — Thu, 05 Oct 2006 09:48:48 GMT

Shalom,

This is probably a volume group problem, not a logical volume problem.

The default configuration for a vg spreads the available PE's over a max of 255 disks. Since most vg's don't have that a lot of capacity is wasted.

The vg should be rebuilt with the vgcreate command and the -p parameter. Set max physical volumes at a reasonable level. Make sure you set it high enough, rebuilding a vg is no fun and it can't be modified on the fly.

SEP

Re: max lvol size

Eli_pok — Thu, 05 Oct 2006 14:39:27 GMT

Thank for the replys!

Re: max lvol size

Eli_pok — Wed, 11 Oct 2006 04:35:09 GMT

I've resived an answer to my problem