SnapMirror TDP 7mode to Cmode LUNS - why are volumes hidden?
2017-03-08 09:01 AM
been puzzling over a problem while testing our 7mode to Cmode transition scripts for Exchange 2010 LUNs that are connected to Win2008R2EE hosts.
We are using the SnapMirror TDP method. source is 7mode 8.1.4p9D18, destination is Cmode 8.3.2P2
I setup a couple of extra SnapMirrors to test the cutover procedure and to confirm the vols are mountable after cutover using SnapDrive (7.1.3P3)
We encountered trouble mounting the vols with SnapDrive, which would timeout after 120seconds (spent many hours with NetApp support troubleshooting)
Interestingly, SnapDrive waits for the arrival of the disk which is successful, we can see the disk arrive in DiskMgmt.msc, filesystem is recognized as NTFS, healthy.
SnapDrive then waits for the volume to arrive, which never happens, and SnapDrive times out.
We can manually assign a drive letter and access the contents of the disk, everything looks intact.
Eventually we discovered using DiskPart that the transitioned luns are "hidden" so SnapDrive cannot see the volume arrive.
i.e. vol 5 below
DISKPART> list vol
Volume ### Ltr Label Fs Type Size Status Info
---------- --- ----------- ----- ---------- ------- --------- --------
Volume 0 R DVD-ROM 0 B No Media
Volume 1 System Rese NTFS Partition 100 MB Healthy System
Volume 2 C NTFS Partition 39 GB Healthy Boot
Volume 3 S Swap NTFS Partition 11 GB Healthy Pagefile
Volume 4 D Data NTFS Partition 39 GB Healthy
Volume 5 M:\DB03\ NTFS Partition 1434 GB Healthy Hidden
We can clear the hidden attribute and then SnapDrive can mount and unmount the disk no problem. The setting sticks with the lun.
Question is - why are these transitioned luns set to hidden?
The source luns are not hidden.
I cannot find any documentation about this.
NetApp support seems to be just as perplexed so far as we are.