Intended to aid in the transition of LUNs from 7-Mode to clustered Data ONTAP (cDOT), this tool consists of a set of WFA workflows and associated applications that convert the 7-Mode LUNs to files, then mirror those files to a cDOT cluster, and finally convert the files back into LUNs on the cDOT destination.
Interestingly, the conversion is actually performed via Windows PowerShell cmdlets. The tool allows per-volume or per-LUN migration, leaving the source data intact. Although Snapshot history is not copied, it preserves any storage efficiencies during offline migrations.
Online migrations perform a LUN-to-file conversion via NFS hardlinks, which requires a temporary “staging volume” to hold a copy of the source LUN. The application and host are shut down before cutover. Cutover downtime is minimal, usually the time it takes to complete the host remediation activities -- regardless of LUN size.
The LUN Migration Tool requires several components, including:
- OnCommand Workflow Automation (WFA) 2.2 RC1 or later
- OnCommand Unified Manager Core Package 5.2 for 7-Mode
- OnCommand Unified Manager 6.1 RC1 for clustered Data ONTAP
The source storage system must be running Data ONTAP 7.3.x or 8.x 7-Mode. The staging storage system must be qualified to be the source of the clustered Data ONTAP Transition Data Protection (TDP) SnapMirror, and the destination storage system must be running clustered Data ONTAP 8.2.x.
For more details, see NetApp Technical Report 4314 entitled Workflow Automation for SAN LUN Migration: 7-Mode LUN Transition to Clustered Data ONTAP 8.2.