Tape drive performance slow on Windows 2003 Media Server

[Matthew_Sanford]

NBU 6.5.2, SF Win 5.1, LTO3 drives, doing a snapshot and then writing to a media server. Only getting 33mb/sec right now, but had somehow got it to do closer to 80 a month ago on the testing, but cant recall what change I made to do that.  Had to rebuild the server, but dont remember what I had to change to get it to do better. Modified buffers/qtys of course, but not sure what else to check.  The DMP stats are showing me reading the luns at 80-90mb/sec, but only writing less than half that speed.  Thoughts on what to check or what is going on? Thanks!

[Omar_Villa]

can be everywhere

tape drive -> internal buffer -> FC Interface -> HBA -> OS Drivers -> NBU Buffers

the first try can be with the buffers between the drive and the server, then check if you have any memory issues, try also reseting your HBA's.

[sdo]

NetBackup v6.5 Backup Planning and Performance Tuning Guide:

http://seer.entsupport.symantec.com/docs/307083.htm

If you do any further testing, several of us would be quite keen to know what values you settle on.