Re: [Xen-users] Detach specific partition LVM of XEN

[Stephan Seitz <s.seitz@xxxxxxxxxxxx>]

Hi,

i assume your lvm problem is caused by an overeager udev configuration
which sets up device entries for partitions _inside_ the lv as well as for
the lv itself.

try to
# kpartx -d /dev/yourvg/yourlv
to release these mapper entries before lvremove the lv.


if you renamed this lv, you need to check and re-assign /dev/mapper entries
manually before you're able to remove the entries.

when you're done, check for updated udev and/or lvm packages for your distro.

cheers,

Stephan




Souza Anderson schrieb:
> Hi...
>  
> I have had a problem when I am going to detach one specific LVM 
> partitions of Xen, so I have been trying xm destroy <domain>, lvchange 
> -an <lvm_partition>, lvremove -f.... So I haven't had sucess. I 
> restarted the server with init 1 yet and nothing... I have seem two 
> specific process started xenwatch and xenbus, but I am not sure if this 
> processes have some action over LVM partitions + XEN. 
> I need to know how can I remove this partition to build another xen VM, 
> an if  I need to stop the xend and xendomais services to do the detachment.
>  
> Thanks so much!!!!
>  
>   VG Name                VGxen
>   LV UUID                vsdRV1-j7cA-LlZI-dAvv-yPC1-lCEt-OQY3W3
>   LV Write Access        read/write
>   LV Status              available
>   # open                 4
>   LV Size                17.69 GB
>   Current LE             4529
>   Segments               1
>   Allocation             inherit
>   Read ahead sectors     0
>   Block device           253:0
> srv01-Debian:~# xm list
> Name                                        ID   Mem VCPUs      State   
> Time(s)
> Domain-0                                     0   238     1     
> r-----     29.2
> vm01                                         1   256     1     
> -b----      0.1
> srv01-Debian:~# xm destroy vm01
> srv01-Debian:~# xm list
> Name                                        ID   Mem VCPUs      State   
> Time(s)
> Domain-0                                     0   238     1     
> r-----     31.5
> srv01-Debian:~# lvdisplay
>   --- Logical volume ---
>   LV Name                /dev/VGxen/VM01_Debian
>   VG Name                VGxen
>   LV UUID                vsdRV1-j7cA-LlZI-dAvv-yPC1-lCEt-OQY3W3
>   LV Write Access        read/write
>   LV Status              available
>   # open                 2
>   LV Size                17.69 GB
>   Current LE             4529
>   Segments               1
>   Allocation             inherit
>   Read ahead sectors     0
>   Block device           253:0
> srv01-Debian:~# lvchange -an /dev/VGxen/VM01_Debian
>   LV VGxen/VM01_Debian in use: not deactivating
> srv01-Debian:~#
> srv01-Debian:~# /etc/init.d/xendomains stop
> Shutting down Xen domains:  [done]
> srv01-Debian:~# lvchange -an /dev/VGxen/VM01_Debian
>   LV VGxen/VM01_Debian in use: not deactivating
> srv01-Debian:~#
> srv01-Debian:~# /etc/init.d/xend stop
> srv01-Debian:~# lvchange -an /dev/VGxen/VM01_Debian
>   LV VGxen/VM01_Debian in use: not deactivating
> srv01-Debian:~# ps -ef |grep -auxf xen
> grep: xen: No such file or directory
> srv01-Debian:~# ps -ef |grep xen
> root         9     7  0 14:12 ?        00:00:00 [xenwatch]
> root        10     7  0 14:12 ?        00:00:00 [xenbus]
> root      4698     1  0 14:13 ?        00:00:00 xenstored --pid-file 
> /var/run/xenstore.pid
> root      4705     1  0 14:13 ?        00:00:00 xenconsoled
> root      4706  4705  0 14:13 ?        00:00:00 xenconsoled
> root      4707  4706  0 14:13 ?        00:00:00 xenconsoled
> root      5331  5030  0 14:19 pts/1    00:00:00 grep xen
>  
> srv01-Debian:~# lvremove -f VGxen
>   Can't remove open logical volume "VM01_Debian"
> srv01-Debian:~# lvremove -f /dev/VGxen/VM01_Debian
>   Can't remove open logical volume "VM01_Debian"
> srv01-Debian:~# lvs
>   LV          VG    Attr   LSize  Origin Snap%  Move Log Copy%
>   VM01_Debian VGxen -wi-ao 17.69G
> srv01-Debian:~# vgs
>   VG    #PV #LV #SN Attr   VSize  VFree
>   VGxen   1   1   0 wz--n- 17.69G    0
> srv01-Debian:~# pvs
>   PV         VG    Fmt  Attr PSize  PFree
>   /dev/hda5  VGxen lvm2 a-   17.69G    0
>
>
> ------------------------------------------------------------------------
>
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--
Stephan Seitz
Senior System Administrator

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