[linux-lvm] Expanding a PV on a hardware RAID

Alasdair G Kergon agk at redhat.com
Tue Nov 16 15:58:39 UTC 2004

On Mon, Nov 15, 2004 at 12:47:28PM -0600, Jetkins at austinlogistics.com wrote:
> any way to expand a PV, and therein lies my problem.  It seems that without
> a pvexpand or pvresize command, I have no way of utilizing the additional
> space.
LVM1 or LVM2?

> 1)  Am I missing something, or is there currently no way to expand a PV?,

Using LVM2 tools you can pvexpand (offline) by backing up the metadata, 
editing the PV size in it (pe_count), then restoring it.
  new pe_count = 
    floor((new_disk_size_in_512_byte_sectors - pe_start) / extent_size)

> 2)  Would I have been better off creating a partition table and
> pvcreate'ing on /dev/sdb1instead of pvcreate'ing the entire /dev/sdb disk
> initially, given that I could now have created a new partition on the extra
> space and pvreate'd a new PV alongside the old?

That's the supported way.
agk at redhat.com

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