[linux-lvm] Strange behavior adding LUN
Ray Morris
support at bettercgi.com
Mon Feb 20 20:40:53 UTC 2012
> So, weird. Why is the 'pvcreate' seeing the new LUN, seeing that it
> is 2.93TB, but not creating any PE's for use.
You need to vgextend. The PE size is a property of the VG, so until
it's added to a VG there's no way of knowing how big the PEs are and
therefore how many will fit on the PV.
--
Ray Morris
support at bettercgi.com
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On Mon, 20 Feb 2012 10:26:05 +1100
Stuart Browne <stuart.browne at ausregistry.com.au> wrote:
> Hi,
>
> We've been cleaning up some of our storage recently and migrating to
> new disks etc. when I came across this issue.
>
> I've re-allocated some old storage back to a server as a new array,
> but lvm is refusing to allow the LUN to participate. Here's what I
> see:
>
> [root at office ~]# pvcreate /dev/mpath/backup1
> Physical volume "/dev/mpath/backup1" successfully created
> [root at office ~]# pvdisplay /dev/mpath/backup1
> "/dev/mpath/backup1" is a new physical volume of "2.93 TB"
> --- NEW Physical volume ---
> PV Name /dev/mpath/backup1
> VG Name
> PV Size 2.93 TB
> Allocatable NO
> PE Size (KByte) 0
> Total PE 0
> Free PE 0
> Allocated PE 0
> PV UUID ipTgcI-kjdJ-Aucx-cUVs-TWKr-wAFO-Rkd0u8
>
> Thinking it's somehow mussed up the labelling, I had a quick look at
> the disk header:
>
> [root at office ~]# dd if=/dev/mpath/backup1 bs=1k count=1 | cat -v -
> ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@LABELONE^A^@^@^@^@^@^@^@M-Tl^LM-z
> ^@^@^@LVM2
> 001ipTgcIkjdJAucxcUVsTWKrwAFORkd0u8^@^@^@^@M-n^B^@^@^@^@^C^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^P^@^@^@^@^@^@^@M-p^B^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@1+0
> records in 1+0 records out 1024 bytes (1.0 kB) copied, 0.000809
> seconds, 1.3 MB/s
>
> Given that it looks, well, 'ok' to me, I thought I'd 'pvremove' it
> and validate that the disk is empty. It was (^@'s all the way, for
> the first 10MB at least), and re-add it. New UUID, but basically the
> same.
>
> So, weird. Why is the 'pvcreate' seeing the new LUN, seeing that it
> is 2.93TB, but not creating any PE's for use.
>
> Anybody have any idea what I should try next?
>
> Stuart J. Browne
> Senior Unix Administrator, Network Administrator, Database
> Administrator AusRegistry Pty Ltd
> Level 8, 10 Queens Road
> Melbourne. Victoria. Australia. 3004.
> Ph: +61 3 9866 3710
> Fax: +61 3 9866 1970
> Email: stuart.browne at ausregistry.com.au
> Web: www.ausregistry.com.au
>
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