[Linux-cluster] mounting a replicated lun

[emmanuel segura]

vgcfgbackup -f /tmp/mylvm.bck c
change the volume group id: esample
id = "JGWiR6-J5mh-VnQr-168J-uzj6-RjcD-FtmKQo"
pvcreate --restorefile /tmp/mylvm.bck --uuid
"laHRdG-3NPX-MGMj-TQtV-FkV5-Yp3M-gSJaj7" /dev/mapper/mapth5
vgrename JGWiR6-J5mh-VnQr-168J-uzj6-RjcD-FtmKQo new_vg


2013/11/21 Paras pradhan <pradhanparas at gmail.com>

> 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 at 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 at 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 <bmr at 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.
>>
>>
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster
>



-- 
esta es mi vida e me la vivo hasta que dios quiera
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/linux-cluster/attachments/20131121/80980b1b/attachment.htm>