It a LVM2 lun. I have presened both luns to a node. Below mpath2 refers to original lun and mapth5 is a replicated lun. both luns are identical. What I need to do is remove mpath2 and use only mpath5. I am still confused what are the steps i need to do to achieve this. I can't do pvcreate or mkfs.gfs2 I know this.
-- [root@cvtst3 ~]# multipath -ll mpath2 (36000d310002f1c00000000000000001b) dm-4 COMPELNT,Compellent Vol [size=100G][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=1][active] \_ 1:0:4:1 sde 8:64 [active][ready] \_ 1:0:5:1 sdf 8:80 [active][ready] \_ 4:0:4:1 sdi 8:128 [active][ready] \_ 4:0:5:1 sdj 8:144 [active][ready] mpath5 (36000d310002fb000000000000000002b) dm-3 COMPELNT,Compellent Vol [size=100G][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=1][active] \_ 1:0:2:1 sdc 8:32 [active][ready] \_ 1:0:3:1 sdd 8:48 [active][ready] \_ 4:0:2:1 sdg 8:96 [active][ready] \_ 4:0:3:1 sdh 8:112 [active][ready] -- Here is the output of pvs if needed. It says duplicate pvs . I am assuming it sees the lvm label(?) -- [root@cvtst3 ~]# pvs Found duplicate PV 0zbIvXwSZbfjD8Pg2KdqvgcHka30P2Ve: using /dev/mpath/36000d310002f1c00000000000000001bp2 not /dev/mpath/36000d310002fb000000000000000002bp2 PV VG Fmt Attr PSize PFree /dev/mpath/36000d310002f1c00000000000000001bp2 guest_vg_c lvm2 a-- 99.97G 996.00M /dev/sda2 VolGroup00 lvm2 a-- 67.84G 0 ---- Thanks Paras. On Thu, Nov 21, 2013 at 4:24 AM, Bryn M. Reeves <b...@redhat.com> wrote: > On 11/20/2013 10:29 PM, Paras pradhan wrote: > > Since the luns are same in all aspects, will it automatically configure > > itself the new one and mount it to /test? > > As far as mounting goes (this is the same for any file system) it will > depend on how the LUN was configured and used in the first place. > > If you're using something like LVM2 which identifies a device by a label > written to the disk itself then the system will find it and activate > whatever volume groups it contains regardless of the device name or > identifier (WWID). > > If you're using plain multipath or bare devices on the other hand then > the device WWID will be different for the original LUN vs. the > replicated one. This will cause SCSI or multipath device names to change > and if those are used in fstab, scripts or cluster configuration files > then the device will not mount without manual changes to update that > configuration. > > I'm not expert in gfs2 and cluster specifics so you'll need to consider > Bob's advice as well to ensure you get a correct set up for the new > device (and have it consistent across the cluster). > > Regards, > Bryn. > >
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