Re: Cannot delete lvm thin volume

[Nikolay Borisov <kernel@kyup.com>]

On 10/19/2015 05:51 PM, Heinz Mauelshagen wrote:
> 
> Nikolay,
> 
> this is a question for linux-lvm.
Right, will know from now on .

> 
> You're saying the fs is not mounted but the lv is open as of
> your lvdisplay output, thus you can't lvremove it.

How can I see which is the actual user of it? As I stated previously
fuser and lsof didn't show anything relevant. Is there some additional
tools from the lvm suite that I can see to obtain such information?

> 
> 
> Heinz
> 
> 
> On 10/16/2015 02:24 PM, Nikolay Borisov wrote:
>> Hello I have the following thin volume, which I'd like to delete:
>>
>> lvdisplay -v /dev/coregroup/c13537_2k
>>      Using logical volume(s) on command line.
>>    --- Logical volume ---
>>    LV Path                /dev/coregroup/c13537_2k
>>    LV Name                c13537_2k
>>    VG Name                coregroup
>>    LV UUID                LBPr0i-uac8-i3Co-5B3M-A6Bv-q8iv-kSRLRr
>>    LV Write Access        read/write
>>    LV Creation host, time xxxxx.net, 2015-10-14 02:02:45 -0500
>>    LV Pool name           corepool
>>    LV Status              available
>>    # open                 1
>>    LV Size                1.80 TiB
>>    Mapped size            42.11%
>>    Current LE             471808
>>    Segments               1
>>    Allocation             inherit
>>    Read ahead sectors     auto
>>    - currently set to     256
>>    Block device           252:6
>>
>> dmsetup info coregroup-c13537_2k
>> Name:              coregroup-c13537_2k
>> State:             ACTIVE
>> Read Ahead:        256
>> Tables present:    LIVE
>> Open count:        1
>> Event number:      1
>> Major, minor:      252, 6
>> Number of targets: 1
>> UUID:
>> LVM-M8PwSxzGcsZQTtdgzfixsr08ZAlNpAbALBPr0iuac8i3Co5B3MA6Bvq8ivkSRLRr
>>
>> dmsetup status
>> coregroup-c13537_2k: 0 3865051136 thin 1627684864 3865042943
>>
>> The version of the software is:
>> lvremove --version
>>    LVM version:     2.02.118(2)-RHEL6 (2015-09-08)
>>    Library version: 1.02.95-RHEL6 (2015-09-08)
>>    Driver version:  4.26.0
>>
>> And the kernel is 3.12.47.
>>
>> When I run 'lvremove -f /dev/coregroup/c13537_2k' I get the following
>> error: Logical volume coregroup/c13537_2k contains a filesystem in use.
>> I also get the same error when I try to deactivate the volume.
>>
>> fuser doesn't report anything and the volume is not mounted anywhere. I
>> have also acquired an ftrace trace from executing lvremove but there are
>> multiple invocation of the dm_ioctl function and I'm not sure which one
>> is the relevant. So if you tell me what information in particular you
>> need I'd post it here.
>>
>> Regards,
>> Nikolay
>>
>> -- 
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>