System software/versions: Windows Server 2012 R2, VEEAM 9.5 Update 2
HP DL380 G7, 2 X Xeon E5-2960 v2 (20 total cores @ 3.0GHz), 192 GB RAM
Repository: Promise VESS R2600xid, 220 TB (formatted), 10 GB/s iSCSI network
Tape drive/media: HP 1x8 G2 Autoloader (SAS), LTO-7, with HP LTO-7 tapes
We have set it all up and are getting good performance out of the backups of our VMs to tape (about 270 MB/s), but the backups produced by VEEAM Agents on a couple of physical servers is really slow (about 40 MB/s). The bottleneck for those tasks is reported as: Source 91% > Proxy 0% > Network 14% > Target 25%. There is nothing else accessing that source at the time the tape job is running. In fact, there isn't anything happening on the server either (it is after business hours, and the other backup prep/job starts 2 hours later).
All the other tasks in the tape job report something like this: Source 12% > Proxy 6% > Network 24% > Target 99%. This is what I wold expect.
I don't understand why the two VEEAM Agent generated files are so much slower. I can't find any way to change anything about how the tape job processes those VEEAM Agent related backups either. What options do I have to speed those tasks up?