Traget path count reduced after SMAS failover

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Category:: ontap-select

Specialty:: SAN

Last Updated:

Applies to

SnapMirror Active Sync (SMAS)
Windows Server
VMware ESXi 8.0.3
SnapMirror Business Continuity (SMBC)

Issue

After performing a SnapMirror Active Sync (SMAS) planned failover from Site A to Site B, for one of the luns, only 4 paths per LUN are visible on host end instead of the expected 8 paths (4 from Site A, 4 from Site B).
Attempts to rescan and reboot from the host side did not restore the missing paths.
No explicit ONTAP error codes were reported.
No APD (All Paths Down) or PDL (Permanent Device Loss) confirmed in logs
No storage-side, SAN, or SnapMirror configuration issues found
No known ONTAP defects identified for this behavior
As per the debug san lun show-target-port-groups output shared from the DR/Secondary side for the affected LUN, we are advertising the paths 13e8 (5096) and 13e9 (5097) to the host, which means that from ONTAP side as we are advertising the paths from secondary correctly.
However, the mpclaim output on the Windows end is not listing paths - 5096 and 5097.

Since another LUN on the same node is reporting paths correctly at host, this indicates that there is no such discovery or session related issue.

cluster::>set d

cluster::*> debug san lun show-target-port-groups

Vserver Node Path Target Port Groups

------- -------------------- ----- ------------------------------------------

svm_dr /vol/vol1/lun1

Node-01 13e9 Active/Non-Optimized: 6

13e8 Active/Optimized: 5

13e9 Active/Non-Optimized: 4

13e8 Active/Optimized: 2

Node-02 13e9 Active/Non-Optimized: 6

13e8 Active/Optimized: 5

13e9 Active/Non-Optimized: 4

13e8 Active/Optimized: 2

PS C:\> mpclaim -s -d 6

MPIO Disk6: 06 Paths, Round Robin with Subset, Implicit Only

Controlling DSM: Microsoft DSM

SN: 600A098038323461692B596157xyxyxy ---> Affected Lun ( total 4 non optimized paths and no optimized path-- Total 4 Paths for the lun)

Missing Paths to the DR Site ( 2 Paths missing)

Supported Load Balance Policies: FOO RRWS LQD WP LB

Path ID State SCSI Address Weight

---------------------------------------------------------------------------

0000000077020005 Active/Unoptimized 002|000|005|001 0

TPG_State : Active/Unoptimized, TPG_Id: 1001, : 4

0000000077020004 Active/Unoptimized 002|000|004|001 0

TPG_State : Active/Unoptimized, TPG_Id: 1000, : 2

0000000077020001 Active/Unoptimized 002|000|001|001 0

TPG_State : Active/Unoptimized, TPG_Id: 1001, : 3

0000000077020000 Active/Unoptimized 002|000|000|001 0

TPG_State : Active/Unoptimized, TPG_Id: 1000, : 1

PS C:\> mpclaim -s -d 7

MPIO Disk7: 06 Paths, Round Robin with Subset, Implicit Only

Controlling DSM: Microsoft DSM

SN: 600A098038323461692B596157xxxxxx ---> Unaffected Lun ( total 5 non optimized paths and one optimized path-- Total 6 Paths for the lun)

Supported Load Balance Policies: FOO RRWS LQD WP LB

Path ID State SCSI Address Weight

---------------------------------------------------------------------------

0000000077020005 Active/Unoptimized 002|000|005|002 0

TPG_State : Active/Unoptimized, TPG_Id: 1001, : 4

0000000077020004 Active/Unoptimized 002|000|004|002 0

TPG_State : Active/Unoptimized, TPG_Id: 1000, : 2

0000000077020003 Active/Unoptimized 002|000|003|002 0

TPG_State : Active/Unoptimized, TPG_Id: 5097, : 4102

0000000077020002 Active/Optimized 002|000|002|002 0

TPG_State : Active/Optimized , TPG_Id: 5096, : 4101

0000000077020001 Active/Unoptimized 002|000|001|002 0

TPG_State : Active/Unoptimized, TPG_Id: 1001, : 3

0000000077020000 Active/Unoptimized 002|000|000|002 0

TPG_State : Active/Unoptimized, TPG_Id: 1000, : 1