Private region of LVM disk

[amit mehta_2]

Hi,

How can i find the private region of LVM disk.
In case of VxVM it is defined in /etc/default/vxdisk and the value defined here
can be overridden with a different value on the command line at the time of initializing a disk.

Excerpt from the man page of vxdisk:
privlen=length


The length of the private region. If this is not specified,
then a default is chosen. For the simple and cdsdisk types,
the default size is 32MB. The maximum possible size of the
private region is 524288 blocks.

The default value of privlen may also be overridden by a
suitable entry in the /etc/default/vxdisk file.

For disk under VxVM control:


root@hpia7// $ vxdisk list c11t2d0|grep ^private
private: slice=0 offset=128 len=32768 disk_offset=0

This value(len=32768) can be altered.

e.g.
root@hpia7// $ vxdisk -f init c11t2d0 privlen=52768
root@hpia7// $ vxdisk list c11t2d0|grep ^private
private: slice=0 offset=128 len=52768 disk_offset=0

So do we have something similar for LVM disk.

~amit

[Robert-Jan Goossens]

Amit,

Have a look at this doc.

http://docs.hp.com/en/5991-6481/ch04s01.html

And if you have a support contract linked to your forums userid, check this one.

Europe
http://www4.itrc.hp.com/service/cki/docDisplay.do?docLocale=en&docId=emr_na-c01037913-1

US
http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en&docId=emr_na-c01037913-1

Regards,
Robert-Jan

[whiteknight]

Hi Amit,

Yes, it is possible to print out the PVRA of the LVM, you need to get this tool from HP Support called lvm.11 tool

This is a great tool

WK
please assign points

[tkc]

ya, the area you mentioned is called
reserved area. we have :

a) physical volume reserved area (PVRA)
b) volume group reserved area (VGRA).
c) boot data reserved area (BDRA)

those areas are created during the pvcreate command execution