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