topic Re: CIFS backup too slow and differential does not work with Symantec in Network and Storage Protocols

CIFS backup too slow and differential does not work with Symantec

robertstein — Thu, 05 Jun 2025 06:39:39 GMT

I want to implement CIFS but have found that the backup takes five time longer than when we used windows file shares. Differential backup do not seem to work with Symantec most likely due to archive bit not being turned on (would modified time work?). We must use CIFS backup and not NDMP due to disaster recovery needs.

Does anyone have a way to improve CIFS backup so I can implement rather than return to file shares?

Re: CIFS backup too slow and differential does not work with Symantec

scottgelb — Tue, 13 Dec 2011 16:59:15 GMT

CIFS backup isn't fun... for DR is it because you may not have a NetApp or other ndmp device to restore to? That sounds like the reason which makes sense...

Do you have VSCAN enabled? That often can be an issue... you can create new shares to the same data path using -novscanread or -novscan and use those paths if that is the case... vscan can slow it down... also make sure e0M isn't being used but probably isn't... I wouldn't expect much throughput of a cifs backup... and would consider getting a small FAS2040 or something for the DR site so you can use NDMP if that is the reason not to use ndmp.

Also are there millions of files? ndmp would have the same inode count slowness if a large file count.

Re: CIFS backup too slow and differential does not work with Symantec

robertstein — Tue, 13 Dec 2011 17:51:55 GMT

Yes we have only one SAN, DR site has a cheaper solution. We do not have any AV running on the CIFS folders yet.