Xen users - Apr 2008 - howto delete a lvm with windows partition

Hi List,

slightly OT but i have Xen and Windows running (xen 3.2.0, hvm, win
2k3) on top of a  lvm volume. Now i want to delete such a volume but i
got the message:
$ lvremove /dev/Xen0/Win2kServer
  Can''t remove open logical volume "Win2kServer"

The volume is not in use by any VM, but there is a partition table on
it with 8Megs of free space and a ntfs partition. I also got 2
devnodes i /dev/mapper :
brw-r-----  1 root disk 254, 52 Mar 27 14:03 Xen0-Win2kServer
brw-r-----  1 root disk 254, 53 Mar 27 14:03 Xen0-Win2kServer1

So how can i remove such a lvm volume?

regards Martin

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On Tue, 2008-04-08 at 07:31 +0200, Martin Hierling
wrote:
> Hi List,
Hi Martin,
> devnodes i /dev/mapper :
> brw-r-----  1 root disk 254, 52 Mar 27 14:03 Xen0-Win2kServer
> brw-r-----  1 root disk 254, 53 Mar 27 14:03 Xen0-Win2kServer1

Try:

# kpartx -d /dev/mapper/Xen0-Win2kServer

The device "Xen0-Win2kServer1" MUST go away, so you will be able to
delete this device.

Regards

-- 
Tiago Cruz
http://everlinux.com
Linux User #282636



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Martin Hierling wrote:
> 
> Hi List,
> 
> slightly OT but i have Xen and Windows running (xen 3.2.0, hvm, win
> 2k3) on top of a  lvm volume. Now i want to delete such a volume but i
> got the message:
> $ lvremove /dev/Xen0/Win2kServer
>   Can''t remove open logical volume "Win2kServer"
> 
> The volume is not in use by any VM, but there is a partition table on
> it with 8Megs of free space and a ntfs partition. I also got 2
> devnodes i /dev/mapper :
> brw-r-----  1 root disk 254, 52 Mar 27 14:03 Xen0-Win2kServer
> brw-r-----  1 root disk 254, 53 Mar 27 14:03 Xen0-Win2kServer1
> 
> So how can i remove such a lvm volume?
What''s the output of ''lvs''? Maybe it is open
somewhere when you
think it is not. If you find it is open an ''lsof /dev/mapper''
may show you what process has it open.

-Ross



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Hi,
> What''s the output of ''lvs''? Maybe it is open
somewhere when you
>  think it is not. If you find it is open an ''lsof
/dev/mapper''
>  may show you what process has it open.
@Ross:
$ lvs | grep Win2k
  Win2kServer     Xen0 -wi-ao   8.00G

dont know what it tells me.

~ $ lsof /dev/mapper/Xen0-Win2kServer
~ $ lsof /dev/mapper/Xen0-Win2kServer1

no output!

@Tiago:
$ partx  -l /dev/mapper/Xen0-Win2kServer
# 1:         0-       -1 (        0 sectors,      0 MB)
# 2:         0-       -1 (        0 sectors,      0 MB)
# 3:         0-       -1 (        0 sectors,      0 MB)
# 4:         0-       -1 (        0 sectors,      0 MB)

$ partx  -d /dev/mapper/Xen0-Win2kServer
error deleting partition 1: BLKPG: Invalid argument

no success...

any more ideas?

regards Martin

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Hi,

dont know what did the trick, but
partx -d /dev/xy and deleting the partitions with fdisk and reboot to
reread the partition table, after that it is possible to delete the
device!

tnx to Ross and Tiago

  Martin

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On Tue, 2008-04-08 at 18:32 +0200, Martin Hierling wrote:
> @Tiago:
> $ partx  -l /dev/mapper/Xen0-Win2kServer
Martin,

It''s not "partx"! The correct command was
"kpartx(8)":

# kpartx -d /dev/mapper/Xen0-Win2kServer

kpartx - Create device maps from partition tables
	-d     Delete partition mappings

# rpm -qf /sbin/kpartx
kpartx-0.4.7-12.el5_1.3


-- 
Tiago Cruz
http://everlinux.com
Linux User #282636



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Tiago:
>  It''s not "partx"! The correct command was
"kpartx(8)":
the one who can read are in advantage :-(
i have tried it with kpartx and it works like a charm.

tnx again, Martin

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