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During VIS remote replication, RLINK repeatedly disconnect and connect, causing SRL full and overflow

Publication Date:  2012-10-09 Views:  60 Downloads:  0
Issue Description
During VVR remote replication, RLINK repeatedly disconnect and connect, cause SRL full and overflow. After customer eliminates network cause, the fault remains.
Error information on syslog:
Jul 14 16:25:34 DUBAIN2000SERVER0 last message repeated 20 times
Jul 14 16:25:34 DUBAIN2000SERVER0 vxio: [ID 467919 kern.warning] WARNING: VxVM VVR vxio V-5-0-266 Rlink a_to_b_rlk disconnected from remote
Jul 14 16:25:35 DUBAIN2000SERVER0 vxio: [ID 910032 kern.notice] NOTICE: VxVM VVR vxio V-5-0-330 Unable to connect to rlink a_to_b_rlk on rvg wm_rvg: Rlink already connected on remote
Jul 14 16:25:36 DUBAIN2000SERVER0 vxio: [ID 490591 kern.notice] NOTICE: VxVM VVR vxio V-5-0-265 Rlink a_to_b_rlk connected to remote
Jul 14 16:31:09 DUBAIN2000SERVER0 vxio: [ID 218356 kern.warning] WARNING: VxVM VVR vxio V-5-0-267 Rlink a_to_b_rlk disconnecting due to ack timeout on update message
Jul 14 16:31:11 DUBAIN2000SERVER0 last message repeated 19 times
Jul 14 16:31:11 DUBAIN2000SERVER0 vxio: [ID 467919 kern.warning] WARNING: VxVM VVR vxio V-5-0-266 Rlink a_to_b_rlk disconnected from remote
Jul 14 16:31:11 DUBAIN2000SERVER0 vxio: [ID 442312 kern.notice] NOTICE: VxVM VVR vxio V-5-0-209 Log overflow protection on rlink a_to_b_rlk triggered DCM protection
Jul 14 16:31:12 DUBAIN2000SERVER0 vxio: [ID 910032 kern.notice] NOTICE: VxVM VVR vxio V-5-0-330 Unable to connect to rlink a_to_b_rlk on rvg wm_rvg: Rlink already connected on remote
Jul 14 16:31:13 DUBAIN2000SERVER0 vxio: [ID 490591 kern.notice] NOTICE: VxVM VVR vxio V-5-0-265 Rlink a_to_b_rlk connected to remote

Alarm Information
Na
Handling Process
Change RLINK protocol into TCP, this problem can be avoided.
Root Cause
Customer RLINK protocol use UDP, when IO overload, there is problem in VVR solution to replication.
Suggestions
When configure VVR remote replication, it is suggested that use TCP transport after steady network is connected.

END