* [linux-lvm] lvremove: 'snapshot': can't remove 'active'? , non-mounted file system
@ 2010-06-29 14:07 Linda A. Walsh
2010-07-13 6:34 ` Luca Berra
0 siblings, 1 reply; 3+ messages in thread
From: Linda A. Walsh @ 2010-06-29 14:07 UTC (permalink / raw)
To: LVM general discussion and development
lvremove -v /dev/Home/2010.06.27-06.18.55
Using logical volume(s) on command line
Can't remove open logical volume "2010.06.27-06.18.55"
But it isn't mounted.
So why is it saying it is 'open':
ll /dev/mapper shows:
crw-rw---- 1 10, 58 2010-02-02 21:08 control
brw-r----- 1 252, 4 2010-02-02 21:08 Home-2010.06.27--06.18.55
brw-r----- 1 252, 3 2010-02-02 21:08 Home-2010.06.27--06.18.55-cow
brw-r----- 1 252, 2 2010-02-02 21:08 Home-Home
brw-r----- 1 252, 1 2010-02-02 21:08 Home-Home-real
brw-r----- 1 252, 0 2010-02-02 21:08 Home-Share
brw-r----- 1 252, 5 2010-02-02 21:08 Space-Backup
brw-r----- 1 252, 11 2010-06-29 06:40 Space-boot
brw-r----- 1 252, 6 2010-06-29 06:40 Space-root
brw-r----- 1 252, 7 2010-06-28 17:45 Space-Torrents
brw-r----- 1 252, 8 2010-06-29 06:40 Space-usr
brw-r----- 1 252, 9 2010-06-29 06:40 Space-var
brw-r----- 1 252, 10 2010-06-29 06:40 Space-var_cache
So 252 is the mapper device?
Is my real Home partition on 252,1?
I just got a backup error when I tried to backup Home,
which would correspond to 252,2 above. It thinks it
is no longer the same file system as the previous backup,
Should I be backing up Home-Home-real? That doesn't
seem right...
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [linux-lvm] lvremove: 'snapshot': can't remove 'active'? , non-mounted file system
2010-06-29 14:07 [linux-lvm] lvremove: 'snapshot': can't remove 'active'? , non-mounted file system Linda A. Walsh
@ 2010-07-13 6:34 ` Luca Berra
2010-07-13 10:23 ` Ray Morris
0 siblings, 1 reply; 3+ messages in thread
From: Luca Berra @ 2010-07-13 6:34 UTC (permalink / raw)
To: linux-lvm
On Tue, Jun 29, 2010 at 07:07:29AM -0700, Linda A. Walsh wrote:
> lvremove -v /dev/Home/2010.06.27-06.18.55
> Using logical volume(s) on command line
> Can't remove open logical volume "2010.06.27-06.18.55"
>
> But it isn't mounted.
>
> So why is it saying it is 'open':
something is using it
try looking in /sys/block/dm-4/holders, fuser, lsof ...
> ll /dev/mapper shows:
>
>
> crw-rw---- 1 10, 58 2010-02-02 21:08 control
> brw-r----- 1 252, 4 2010-02-02 21:08 Home-2010.06.27--06.18.55
> brw-r----- 1 252, 3 2010-02-02 21:08 Home-2010.06.27--06.18.55-cow
> brw-r----- 1 252, 2 2010-02-02 21:08 Home-Home
> brw-r----- 1 252, 1 2010-02-02 21:08 Home-Home-real
> brw-r----- 1 252, 0 2010-02-02 21:08 Home-Share
> brw-r----- 1 252, 5 2010-02-02 21:08 Space-Backup
> brw-r----- 1 252, 11 2010-06-29 06:40 Space-boot
> brw-r----- 1 252, 6 2010-06-29 06:40 Space-root
> brw-r----- 1 252, 7 2010-06-28 17:45 Space-Torrents
> brw-r----- 1 252, 8 2010-06-29 06:40 Space-usr
> brw-r----- 1 252, 9 2010-06-29 06:40 Space-var
> brw-r----- 1 252, 10 2010-06-29 06:40 Space-var_cache
>
> So 252 is the mapper device?
252 is the dynamic major assigned to device-mapper on your system
> Is my real Home partition on 252,1?
before you created the snapshot your Home device was
/dev/mapper/Home-Home (aka dm-2)
in order to create a snapshot lvm will use 4 devices
1) Home-Home-real (linear) which has the same mapping as Home-Home before the
snapshot took place
2) Home-2010.06.27--06.18.55-cow (linear) which maps the space that will
contains the COW data
3) Home-2010.06.27--06.18.55 (snapshot) this is a combination of (1) and
(2) in order to show the visible snapshot
4) Home-Home (snapshot-origin) this device replaces your Home device
(keeping the same minor number)
so after taking the snapshot your Home device is still
/dev/mapper/Home-Home, which maps to /dev/mapper/Home-Home-real, but
before any write to /dev/mapper/Home-Home-real the original data is
saved to Home-2010.06.27--06.18.55-cow, so Home-2010.06.27--06.18.55
(which is based on Home-Home-real and Home-2010.06.27--06.18.55-cow) will
not change
please look also at linux/Documentation/device-mapper/snapshot.txt
> I just got a backup error when I tried to backup Home,
> which would correspond to 252,2 above. It thinks it
> is no longer the same file system as the previous backup,
details please
> Should I be backing up Home-Home-real? That doesn't
> seem right...
usually one backs up the snapshot, which is supposed to be a
point-in-time copy of the original, so i think you should backup
Home-2010.06.27--06.18.55
L.
--
Luca Berra -- bluca@comedia.it
Communication Media & Services S.r.l.
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [linux-lvm] lvremove: 'snapshot': can't remove 'active'? , non-mounted file system
2010-07-13 6:34 ` Luca Berra
@ 2010-07-13 10:23 ` Ray Morris
0 siblings, 0 replies; 3+ messages in thread
From: Ray Morris @ 2010-07-13 10:23 UTC (permalink / raw)
To: LVM general discussion and development
>> lvremove -v /dev/Home/2010.06.27-06.18.55
>> Using logical volume(s) on command line
>> Can't remove open logical volume "2010.06.27-06.18.55"
Does it have a partition which needs to be "released"? with kpartx
-dv?
Try ls -al /dev/Home/2010.06.27-06.18.55*
--
Ray Morris
support@bettercgi.com
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On 07/13/2010 01:34:13 AM, Luca Berra wrote:
> On Tue, Jun 29, 2010 at 07:07:29AM -0700, Linda A. Walsh wrote:
>> lvremove -v /dev/Home/2010.06.27-06.18.55
>> Using logical volume(s) on command line
>> Can't remove open logical volume "2010.06.27-06.18.55"
>>
>> But it isn't mounted.
>>
>> So why is it saying it is 'open':
> something is using it
> try looking in /sys/block/dm-4/holders, fuser, lsof ...
>
>> ll /dev/mapper shows:
>>
>>
>> crw-rw---- 1 10, 58 2010-02-02 21:08 control
>> brw-r----- 1 252, 4 2010-02-02 21:08 Home-2010.06.27--06.18.55
>> brw-r----- 1 252, 3 2010-02-02 21:08 Home-2010.06.27--06.18.55-cow
>> brw-r----- 1 252, 2 2010-02-02 21:08 Home-Home
>> brw-r----- 1 252, 1 2010-02-02 21:08 Home-Home-real
>> brw-r----- 1 252, 0 2010-02-02 21:08 Home-Share
>> brw-r----- 1 252, 5 2010-02-02 21:08 Space-Backup
>> brw-r----- 1 252, 11 2010-06-29 06:40 Space-boot
>> brw-r----- 1 252, 6 2010-06-29 06:40 Space-root
>> brw-r----- 1 252, 7 2010-06-28 17:45 Space-Torrents
>> brw-r----- 1 252, 8 2010-06-29 06:40 Space-usr
>> brw-r----- 1 252, 9 2010-06-29 06:40 Space-var
>> brw-r----- 1 252, 10 2010-06-29 06:40 Space-var_cache
>>
>> So 252 is the mapper device?
>
> 252 is the dynamic major assigned to device-mapper on your system
>
>> Is my real Home partition on 252,1?
> before you created the snapshot your Home device was
> /dev/mapper/Home-Home (aka dm-2)
> in order to create a snapshot lvm will use 4 devices
> 1) Home-Home-real (linear) which has the same mapping as Home-Home
> before the
> snapshot took place
> 2) Home-2010.06.27--06.18.55-cow (linear) which maps the space that
> will
> contains the COW data
> 3) Home-2010.06.27--06.18.55 (snapshot) this is a combination of (1)
> and
> (2) in order to show the visible snapshot
> 4) Home-Home (snapshot-origin) this device replaces your Home device
> (keeping the same minor number)
>
> so after taking the snapshot your Home device is still
> /dev/mapper/Home-Home, which maps to /dev/mapper/Home-Home-real, but
> before any write to /dev/mapper/Home-Home-real the original data is
> saved to Home-2010.06.27--06.18.55-cow, so Home-2010.06.27--06.18.55
> (which is based on Home-Home-real and Home-2010.06.27--06.18.55-cow)
> will
> not change
>
> please look also at linux/Documentation/device-mapper/snapshot.txt
>
>> I just got a backup error when I tried to backup Home,
>> which would correspond to 252,2 above. It thinks it
>> is no longer the same file system as the previous backup,
> details please
>
>> Should I be backing up Home-Home-real? That doesn't
>> seem right...
> usually one backs up the snapshot, which is supposed to be a
> point-in-time copy of the original, so i think you should backup
> Home-2010.06.27--06.18.55
>
> L.
>
>--
> Luca Berra -- bluca@comedia.it
> Communication Media & Services S.r.l.
> /"\
> \ / ASCII RIBBON CAMPAIGN
> X AGAINST HTML MAIL
> / \
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
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2010-06-29 14:07 [linux-lvm] lvremove: 'snapshot': can't remove 'active'? , non-mounted file system Linda A. Walsh
2010-07-13 6:34 ` Luca Berra
2010-07-13 10:23 ` Ray Morris
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