We are in the process of taking snapshots and clones of a VM server. The lun is a RDM in physical mode. I wanted to confirm the setup to mount the snapshot or clone to a VM mount host.
For the clone lun:
1. I need add it to the EMC & ESX storage group.
2. Add the clone to the VM mount host as a RDM.
3. Check maintain lun visibility after mount in RM.
By following these steps I will ensure the VM mount host sees the luns any time we need to un-mount and re-mount the clone. Please confirm.
For the snapshot:
*Not sure what is needed since the snap cache is in private luns. What is required so we can mount a snapshot.
We usually keep 4 sessions in the rotation so anyone could be mounted. Do we need to create a manual snap device for each session.
Also in RM you have the ability to delete the snapshot, if this is done for troubleshooting or clean-up reasons what happens to the snap device. Does it get deleted from the array and you will need to remove the RDM and re-create a new snap device. Similar question when the snapshots expire in the rotation.
You will only need to create one snap device per mount host. A snapshot is only activated against one session at a time, so while you will have 4 sessions in rotation (the actual point-in-time image of the source LUN), you will only be accessing one session at a time and therefore will only need one snapshot.
When you manually create the snapshot for use with a VM mount host I believe that only the session is deleted when deleting the snapshot in the RM console. I thought that was how it worked when I did some testing, but I would test it yourself to be sure.