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July 15th, 2025 10:31

problem accessing a single cifs share to a data domain 9900 with veritas backup

hi 

we have a problem accessing a single cifs share to a data domain 9900 with veritas backup  , 

Network Configuration

   - The system is configured with two separate LACP aggregates:

     - One (6 interfaces) dedicated to replication

     - One (6 interfaces) dedicated to operational traffic, which includes CIFS, NFS, and DDBoost protocols.

 

Issue Specifics

   - The problem occurs even when launching a single Veritas backup job towards a specific CIFS share.

   - The backup job seems to start, but shortly after, connectivity to the share is lost and the job fails.

   - Importantly, we do not see this problem on other CIFS shares exposed by the same Data Domain.

 

Stream Load

   - We are aware that the Data Domain is occasionally approaching the maximum supported outbound stream limit (540), but we confirm that:

     - The failure happens even with no other active jobs

     - The issue is isolated to one share, and not observed on others, which seems to exclude global stream exhaustion as the root cause.

Authentication

   - We previously had an issue with the CIFS credential (password expired), which has been resolved.

   - Currently, authentication appears to succeed, but the session disconnects a few seconds after the backup starts.

 

any idea or experience about this issue ? 

thanks

giacomo cester

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