2014-01-07 07:43 AM
I need to cutover from one FAS to another, a task I have accomplished many times before using SnapMirror to transfer the data. Using OnTap 7.3.7
Previously I have only had to cutover CIFS and NFS, however on this occasion I also have two iSCSI LUNs.
How does the new FAS recognise the LUNs which were created on the original FAS? I assume I will also need to configure initiator groups.
I can't see any config files in my etc directory in the root volume which relate to iscsi.
Can someone advise on the right way to migrate iSCSI LUNs between filers?
Solved! SEE THE SOLUTION
2014-01-07 08:23 AM
I have done this before. Snapmirror the data, and the new controller will see the luns with "lun show". You're right, you'll need to configure the inititator groups, etc.
One caveat - luns have a serial number that I don't believe is copied with snapmirror. Some applications (Exchange comes to mind) are picky about this serial number; they won't let you use data on a different lun serial, even though it's the same drive letter. List the existing lun's serial with "lun serial <lun_path>", and set the new lun's serial with "lun serial <lun_path> <serial>".
2014-01-07 10:22 AM
I found the above steps to be a cleaner way to migrate LUNs to new filer.
2014-01-07 11:19 AM
Yes, you will need to manually create igroups and mapping on destination filer - they are not replicated. Also LUN serial numbers will change - this may be problem depending on host OS (e.g. VMware will not mount them by default).