We hit somewhat interesting problem with SME 4.0. After start of backup with verification on remote destination SME waits for transfer to start and after 3 minutes times out and fails verification. Verification for the second LUN on the same volume started later runs OK (including waiting for transfer to complete). I.e.

[14:42:50.963] ------------ SnapMirror Update ---------------

[14:42:50.963] SnapMirror is going to update the following Exchange Disks: [14:42:50.963] E [14:42:50.963] F [14:42:50.963] H [14:42:50.963] e [14:42:51.072] Requesting SnapMirror update transfer for LUN E. [14:42:55.025] Request for SnapMirror update transfer of LUN E sent successfully. [14:42:55.025] Requesting SnapMirror update transfer for LUN F. [14:43:11.541] Request for SnapMirror update transfer of LUN F sent successfully.

[14:43:11.541] ***BACKUP VERIFICATION: SG2

[14:43:11.557] Start to verify the database in snapshot...

[14:43:22.417] Initializing SnapManager server on remote machine yyy...

[14:43:29.651] Mounting Snapshot [exchsnap__xxx__recent] for LUN H created from Computer xxx [14:43:29.714] Using default mount point directory [C:\Program Files\NetApp\SnapManager for Exchange\SnapMgrMountPoint] [14:43:29.714] SnapShot exchsnap__xxx__recent in the selected destination volume xxx:sm_EX_DB will be used to mount a LUN. [14:43:31.557] Starting monitoring SnapMirror update progress... [14:43:31.714] SnapMirror update progress received for destination volume xxx:sm_EX_DB. SnapMirror has transferred 0 kbytes. [14:44:01.870] SnapMirror update progress received for destination volume xxx:sm_EX_DB. SnapMirror has transferred 0 kbytes. [14:44:32.027] SnapMirror update progress received for destination volume xxx:sm_EX_DB. SnapMirror has transferred 0 kbytes. [14:45:02.200] SnapMirror update progress received for destination volume xxx:sm_EX_DB. SnapMirror has transferred 0 kbytes. [14:45:32.450] SnapMirror update progress received for destination volume xxx:sm_EX_DB. SnapMirror has transferred 0 kbytes. [14:46:01.560] SnapMirror transfer progress update progress did not returned within a designated amount of time. SnapManager canceled the SnapDrive operation to mount a LUN on the SnapMirror destination volume.

And later

[14:46:35.717] ***BACKUP VERIFICATION: SG1

[14:46:35.717] Start to verify the database in snapshot...

[14:46:45.249] Initializing SnapManager server on remote machine yyy...

[14:46:52.389] Mounting Snapshot [exchsnap__xxx__recent] for LUN E created from Computer yyy [14:46:52.436] Using default mount point directory [C:\Program Files\NetApp\SnapManager for Exchange\SnapMgrMountPoint] [14:46:52.436] SnapShot exchsnap__xxx__recent in the selected destination volume xxx:sm_EX_DB will be used to mount a LUN. [14:46:55.405] Starting monitoring SnapMirror update progress... [14:46:55.561] SnapMirror update progress received for destination volume xxx:sm_EX_DB. SnapMirror has transferred 0 kbytes. [14:47:25.718] SnapMirror update progress received for destination volume xxx:sm_EX_DB. SnapMirror has transferred 0 kbytes. [14:47:55.953] SnapMirror update progress received for destination volume xxxt:sm_EX_DB. SnapMirror has transferred 8 kbytes. [14:48:26.188] SnapMirror update progress received for destination volume xxx:sm_EX_DB. SnapMirror has transferred 8 kbytes.

After that this runs to completion. Apparently transfer needs ca. 5 minutes to actually start; is it possible to increase SME wait time in this case?

С уважением / With best regards / Mit freundlichen Grüβen

--- Andrey Borzenkov Senior system engineer