We have a very large file server with 4 volumes and millions of small files we are struggling to backup adequately. The client is a windows server 2012 server virtual machine running Netbackup 7.6.0.3 the largest is 6 TB while all the other are about 1.5 TB.
The media server which has an LTO 5 tape drives attached also has the Dedupe pool running windows 2008R2 Netbackup 7.6.0.3
We have 1 policy to back up the 3 X 1.5TB to a Dedupe pool which takes about 8 – 15hrs. We now have another policy to backup just the largest 6TB drive directly to tape once a week.
For each of the volumes we have added an extra volume and configured VSS snapshots to use this for Windows Open File Backup
However the speed we are getting are quite shocking its taking about 7 days to back up the 6TB and this tend to fails as it’s difficult to get 7 days uninterrupted service on the server which is a very busy file server
Looking into more details at the performance and buffer seize discovered this article
http://www.symantec.com/business/support/index?page=content&id=TECH19206
NetBackup client Buffer_Size KB value should match the Media Server NET_BUFFER_SZ byte value for optimal performance
However at the Moment the client Buffer_Size KB is 128KB and the Media Server NET_BUFFER_SZ is 256KB
However then I find this article which contradicts the above saying they should just be 0
http://www.symantec.com/business/support/index?page=content&id=TECH28339
Any ideas on what the buffer setting should be?? Or any advice of backing up the server in an appropriate time frame??
Kind Regards
P/S we have multiple stream, accelerator enabled. Cannot use change journal as the sever is also an Enterprise vault file server so the reparse point prevents the change journal from working