04-03-2014 02:42 AM
Hi,
We will be doing a Storage Migration from EMC Clariion to EMC VNX. Our vendor is suggesting to use MirrorView to block replicate the LUN from CX to VNX.
Once they have completed the LUN replication, they will remove the CX LUN and present the new VNX LUN to the Cluster Server.
Below are the planned steps:
1. Sync the LUN
2. Stop Cluster services
3. Bring down all the nodes
4. Break the replication
5. Remove old LUN and present the new LUN to the hosts
6. Bring up only 1 node
7. Start cluster services
8. Bring Up the rest of the nodes.
Is there anything missed? do we need to deport and import the DG?
Solved! Go to Solution.
04-03-2014 03:28 AM
I assume mirrorview works something like
Hardisk1 is on Cx
Hardisk 11 is on Vnx
You mirror LUN Cx to Vnx so that Harddisk11 is then a copy of Harddisk1, and then you remove Harddisk1 and present Harddisk11 to the server. This being the case you need to replace step 5 with:
You can migrate to new arrary completely online if you use SFW mirroring, i.e, you can leave your cluster running while you break mirror - the process being:
I believe you can do this in VOM also which automates the steps for you
The process is the same concept as for SF on UNIX, - see posts:
https://www-secure.symantec.com/connect/forums/add-disk-vcs-shared-disk-group
https://www-secure.symantec.com/connect/forums/array-migration-using-vxvm-solaris-vcs-cluster
https://www-secure.symantec.com/connect/videos/storage-provisioning-and-array-migration-vom-sf
Mike
04-03-2014 07:11 AM
Hi Karim,
If you have the SFW-HA product, then this entire operation can be done online with no downtime to the application using the mirror feature of SFW. We have customers do this all the time.
There is also no need to deport the diskgroup when removing the old luns. You will need to break the mirror and then remove the old luns from the disk group. VCS and your application will continue working with the new mirror plex on the new array without skipping a beat.
If you are not completely comfortable with the process, please open a case with Symantec Technical Support. We will be happy to answer any questions that you have ahead of time so that your array migation occures without application interuptions.
thank you,
Wally
04-03-2014 03:28 AM
I assume mirrorview works something like
Hardisk1 is on Cx
Hardisk 11 is on Vnx
You mirror LUN Cx to Vnx so that Harddisk11 is then a copy of Harddisk1, and then you remove Harddisk1 and present Harddisk11 to the server. This being the case you need to replace step 5 with:
You can migrate to new arrary completely online if you use SFW mirroring, i.e, you can leave your cluster running while you break mirror - the process being:
I believe you can do this in VOM also which automates the steps for you
The process is the same concept as for SF on UNIX, - see posts:
https://www-secure.symantec.com/connect/forums/add-disk-vcs-shared-disk-group
https://www-secure.symantec.com/connect/forums/array-migration-using-vxvm-solaris-vcs-cluster
https://www-secure.symantec.com/connect/videos/storage-provisioning-and-array-migration-vom-sf
Mike
04-03-2014 03:41 AM
Hi Mike,
Thanks for the reply.
With this we dont need to shutdown/reboot the nodes before presenting the new LUNs?
regards,
Karim
04-03-2014 05:26 AM
No need for reboot if the O/S can see LUNS after presenting them.
Slight correction on last post in that stopping Cluster services should deport diskgroups and starting Cluster services should import diskgroups, so just need to check that all diskgroups are deported before removing LUNs.
Mike
04-03-2014 05:38 AM
https://www-secure.symantec.com/connect/articles/dynamic-reconfiguration-tool
04-03-2014 05:39 AM
To add to the comments above. Starting from SF 6.0.1 , you can add/delete luns dynamically using Dynamic reconfiguration tool. Please find the details here.
https://www-secure.symantec.com/connect/articles/dynamic-reconfiguration-tool
04-03-2014 07:11 AM
Hi Karim,
If you have the SFW-HA product, then this entire operation can be done online with no downtime to the application using the mirror feature of SFW. We have customers do this all the time.
There is also no need to deport the diskgroup when removing the old luns. You will need to break the mirror and then remove the old luns from the disk group. VCS and your application will continue working with the new mirror plex on the new array without skipping a beat.
If you are not completely comfortable with the process, please open a case with Symantec Technical Support. We will be happy to answer any questions that you have ahead of time so that your array migation occures without application interuptions.
thank you,
Wally
04-04-2014 02:39 AM
Hi All,
Thanks for the response & feedback.
appreciate it.
04-04-2014 02:17 PM
I agree, strongly, with Wally. If you have VxFS on the hosts, then, this entire operation can be done online without impacting the cluster or the application. No downtime at all. No need for MirrorView.
Using VOM, the entire process can also be highly automated. It is also possible to cleanup storage, as by default, only used blocks will be moved, making it possible to take advantage of any thin-provisioning supported by the new array.
Cheers