Re: [ovirt-users] best way to remove SAN lun

On Tue, Feb 21, 2017 at 6:10 PM, Nir Soffer <nsoffer(a)redhat.com&gt; wrote: > > This is caused by active lvs on the remove storage domains that were not > deactivated during the removal. This is a very old known issue. > > You have remove the remove device mapper entries - you can see the devices > using: > > dmsetup status > > Then you can remove the mapping using: > > dmsetup remove device-name > > Once you removed the stale lvs, you will be able to remove the multipath > device and the underlying paths, and lvm will not complain about read > errors. > > Nir OK Nir, thanks for advising. So what I run with success on the 2 hosts [root@ovmsrv05 vdsm]# for dev in $(dmsetup status | grep 900b1853--e192--4661--a0f9--7c7c396f6f49 | cut -d ":" -f 1) do dmsetup remove $dev done [root@ovmsrv05 vdsm]# and now I can run [root@ovmsrv05 vdsm]# multipath -f 3600a0b80002999020000cd3c5501458f [root@ovmsrv05 vdsm]# Also, with related names depending on host, previous maps to single devices were for example in ovmsrv05: 3600a0b80002999020000cd3c5501458f dm-4 IBM ,1814 FAStT size=2.0T features='2 pg_init_retries 50' hwhandler='1 rdac' wp=rw |-+- policy='service-time 0' prio=0 status=enabled | |- 0:0:0:2 sdb 8:16 failed undef running | `- 1:0:0:2 sdh 8:112 failed undef running `-+- policy='service-time 0' prio=0 status=enabled |- 0:0:1:2 sdg 8:96 failed undef running `- 1:0:1:2 sdn 8:208 failed undef running And removal of single path devices: [root@ovmsrv05 root]# for dev in sdb sdh sdg sdn do echo 1 > /sys/block/${dev}/device/delete done [root@ovmsrv05 vdsm]# All clean now... ;-)