I would suggest you to perform complete discovery on source volumes storage / Hosts and other dependencies.. And decide how you wanted to move the volumes/exports and what granularity..For e.g. per Application , host , storage , etc..
Plan and set the target storage ready and choose appropriate migration methodology for file level migration.. You didn’t mention the source / target storage in question.
Regarding the Host / UNIX side, it’s pretty straight forward, the below are the pre and post migration activities for for any UNIX NAS volumes.
Pre Migration Cutover Activities |
Check mount details. |
Check /etc/fstab entries. ( persistant and non-persistant) |
Check for stale mount points if any. |
Verify nfs version target compatibility if different |
Verify showmount |
Check access level (RO/RW/ROOT) |
Check if there are any ACLs defined for the nfs mounts |
Check total size,usable space and the number of inodes in nfs mounts |
Check ownership and rwx permissions of NFS file systems. |
Verify the /etc/host entries |
Plan for the cutover window with Volume/App owners , and shutdown the application/database related to the migration volumes when the cutover starts.
Check if any open file and I/O accessed by application/users
Quickly verify pre-migration data and unmount file systems after application/database is shutdown
Post –Cutover :
Verify the nfs services up and running
verify the showmount command
Mount the new volumes with new storage.
Compare the nfs mount details of the file systems after migration
fstab entries
Check if the access(RO/RW/ROOT) holds good after migration
/etc/host entries
Check if the access(RO/RW/ROOT) holds good after migration
Make necessary changes to the ACLs if needed
Compare the total size,usable space and the number of inodes in nfs mounts after migration with that of before migration
Check if the ownership and rwx permissions of all the NFS file systems holds good and coordinate application/database team to ensure all ok
Thats all .. Have Happy Migration...)
