Re: [linux-lvm] Strange behavior adding LUN

[Ray Morris <support bettercgi com>]

> 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
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On Mon, 20 Feb 2012 10:26:05 +1100
Stuart Browne <stuart browne 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 office ~]# pvcreate /dev/mpath/backup1
>   Physical volume "/dev/mpath/backup1" successfully created
> [root 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 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 ausregistry com au
> Web: www.ausregistry.com.au
> 
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