On Sat, January 28, 2012 12:19, Phil Schaffner wrote:
Pardon the top-post and cross-post, but this apparently should have gone to centos-virt@centos.org
Phil
chris procter wrote on 01/27/2012 03:29 PM:
Hi,
Its ages since I came across this problem so my memory is a little hazey but something is obviously holding on to the lv so you'll need to figure out whats holding it and kill that. The open value returned by "dmsetup info" is how many things have the device file open), it looks to be 2 at the moment and you cant "dmsetup remove" untill its zero (lvm might be one of them I cant remember)
A few things worth trying are
- make sure its not mounted anywhere!
[root@vhost01 ~]# umount /dev/vg_vhost01/lv_vm_base umount: /dev/vg_vhost01/lv_vm_base: not mounted
- if multipathd is running try stopping that.
[root@vhost01 ~]# ps -ef | grep multipathd root 465 307 0 09:40 pts/0 00:00:00 grep multipathd [root@vhost01 ~]# service multipathd status multipathd: unrecognized service [root@vhost01 ~]# find / -name multipathd [root@vhost01 ~]#
- either lsof or fuser on the device file may be able
[root@vhost01 ~]# fuser /dev/vg_vhost01/lv_vm_base [root@vhost01 ~]# lsof /dev/vg_vhost01/lv_vm_base [root@vhost01 ~]#
- something vm related might not have let go properly,
are there any deamons/processes etc still running?
There are many vm qeum processes running, non contain any reference to lv_vm_base
[root@vhost01 ~]# ps -ef | grep vm_base root 549 307 0 09:44 pts/0 00:00:00 grep vm_base [root@vhost01 ~]#
- reboot, the sledgehammer aproach to killing off
processes!!
- you could try hitting it with dmsetup again, you need
to suspend the device first using "dmsetup suspend" which *may* persuade the holding process to let go, if it does reduce the open count you'll need to "dmsetup resume" and then suspend again untill open reaches zero when "dmsetup remove" should work. I'd try and avoid this option if you can, you're messing beneath the lvm layer and it may not like that, should be ok but...
[root@vhost01 ~]# dmsetup info -c vg_vhost01-lv_vm_base Name Maj Min Stat Open Targ Event UUID vg_vhost01-lv_vm_base 253 5 L--w 2 1 0 LVM-gXMt00E1RDjpSX3INLZ35Prtg66aX36BeAOlKIkmfSNQRNol3Hni920R4YVaZr52 [root@vhost01 ~]# dmsetup suspend vg_vhost01-lv_vm_base [root@vhost01 ~]# dmsetup info -c vg_vhost01-lv_vm_base Name Maj Min Stat Open Targ Event UUID vg_vhost01-lv_vm_base 253 5 L-sw 2 1 0 LVM-gXMt00E1RDjpSX3INLZ35Prtg66aX36BeAOlKIkmfSNQRNol3Hni920R4YVaZr52
if none of that is possible/works you could try asking on the lvm-linux list.
Am so doing.
Reinstalling really shouldn't be necesary.
Yes. However. . .
-
James B. Byrne