SnapMirror Relationship Issue Leading to Read-Only Volumes
Applies to
- ONTAP 9
- SnapMirror
Issue
SnapMirror relationships were created in both directions between two systems (A → B and B → A) without breaking the original relationship.
This caused both volumes on the source and destination to become read-only, impacting operations.
affa150-2n-rtp-3(Source) ----> aff300-2n-rtp-3(DR) create snapmirror
aff300-2n-rtp-3::> snapmirror create -source-path svmsr:volsr -destination-path svmdr:voldr
Operation succeeded: snapmirror create for the relationship with destination "svmdr:voldr".
aff300-2n-rtp-3::> snapmirror show
Progress
Source Destination Mirror Relationship Total Last
Path Type Path State Status Progress Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
svmsr:volsr XDP svmdr:voldr Uninitialized
Idle
aff300-2n-rtp-3::> snapmirror initialize -destination-path svmdr:voldr
Operation is queued: snapmirror initialize of destination "svmdr:voldr".
aff300-2n-rtp-3::> snapmirror show
Progress
Source Destination Mirror Relationship Total Last
Path Type Path State Status Progress Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
svmsr:volsr XDP svmdr:voldr Snapmirrored
Idle - true -
affa150-2n-rtp-3(DR) <---- aff300-2n-rtp-3(SOURCE)create new reverse snapmirror without delete and release pre snapmirror
affa150-2n-rtp-3::> snapmirror create -source-path svmdr:voldr -destination-path svmsr:volsr
Operation succeeded: snapmirror create for the relationship with destination "svmsr:volsr".
affa150-2n-rtp-3::> snapmirror show
Progress
Source Destination Mirror Relationship Total Last
Path Type Path State Status Progress Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
svmdr:voldr XDP svmsr:volsr Broken-off
Idle - true -
....
affa150-2n-rtp-3::> snapmirror resync -destination-path svmsr:volsr
Warning: All data newer than Snapshot copy snapmirror.bd9bd899-66a3-11f0-a2fd-00a098e66c1b_2157613003.2025-07-21_225609 on volume
svmsr:volsr will be deleted.
Do you want to continue? {y|n}: y
Operation is queued: initiate snapmirror resync to destination "svmsr:volsr".
affa150-2n-rtp-3::> snapmirror show
Progress
Source Destination Mirror Relationship Total Last
Path Type Path State Status Progress Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
svmdr:voldr XDP svmsr:volsr Snapmirrored
Idle
after then both vol type change to DP.
aff300-2n-rtp-3::> vol show
Vserver Volume Aggregate State Type Size Available Used%
--------- ------------ ------------ ---------- ---- ---------- ---------- -----
aff300-rtp-3a
vol0 aggr0_aff300_rtp_3a
online RW 348.6GB 313.9GB 5%
aff300-rtp-3b
vol0 aggr0_aff300_rtp_3b
online RW 348.6GB 314.2GB 5%
svm1 svm1_root aggr1 online RW 1GB 971.6MB 0%
svm1 vol1 aggr1 online RW 500GB 475.0GB 0%
svmdr svmdr_root aggr1 online RW 1GB 972.5MB 0%
svmdr voldr aggr1 online DP 10GB 10.00GB 0% <<<<<
6 entries were displayed.
affa150-2n-rtp-3::> vol show
Vserver Volume Aggregate State Type Size Available Used%
--------- ------------ ------------ ---------- ---- ---------- ---------- -----
a150-rtp-3a
vol0 aggr0_a150_rtp_3a
online RW 151.3GB 93.24GB 35%
a150-rtp-3b
vol0 aggr0_a150_rtp_3b
online RW 151.3GB 94.59GB 34%
svm1 svm1_root aggr1 online RW 1GB 971.6MB 0%
svm1 vol1 aggr1 online RW 500GB 475.0GB 0%
svmsr svmsr_root aggr1 online RW 1GB 972.5MB 0%
svmsr volsr aggr1 online DP 10GB 9.50GB 0% <<<<<<
6 entries were displayed.