Further to another discussion I've posted can I ask for any further advice on slow running backups.
I'm running an IBM x255 with a Ultra160 SCSI supporting 2 LTO3 drives (last post I had said Ultra320, but actually that was running the HDs not the Tapes) I've got Block size at 64k
Buffer size at 1024K
Buffer Count 10
High Water Count 0
Read single block mode - unchecked
Write single block mode - unchecked
Read SCSI pass-through mode - unchecked
Write SCSI pass-through mode - unchecked
If I check the Write single block or SCSI pass-through mode it makes no difference although for some reason that's the settings we have setup on every other server which are running OK, but I've seen a few entries on this frum saying they should be unchecked
I've also tried turning of compression and also altering the buffer size to both 256K and 64k, with no effect.
The server is running Win2003sp2 and Backup Exec is version 10d
Last night I reinstalled Backup Exec and ensured it was patched with Service Pack 4, but the backup starts off and manages to peak at about 750MB/min and then justs gets slower and slower as it runs so that now it's showing a rate of 445MB/min 10 hours after starting. The bulk of the backup is about 800GB of Notes mail files which are all fairly chunky files.
I've one Tape drive installed internally and one in an expansion unit, but have tried having the backup start on either drive with no change to speed.
Any further ideas appreciated.
The previous forum entry can be found at the following link, but bear in mind some details have changed since as mentioned above:
https://www-secure.symantec.com/connect/forums/slow-backup-large-files-lto-drive