I have a Dell 2850 running CentOS 3.9 (a flavor or RH Linux). I am running a SCSI PowerVault 124T - LTO-3 backup system on a different Dell Server
All the connections are via a Gb switch and the eth. cards a re set to 1000/Full Duplex
So from the Linux Server via the switch to the backup server via SCSI to the tape drive.
I am backing up 6 Servers - all the Windows servers perform exceptionally (very fast) - now when I'm going to Linux - It takes forever.
Monitoring the switch port via Solarwinds monitoring, shows over 150mb/s in the first 15 min of the backup job - to drop to a sustained rate of 20-25 mb/s for the next 18 hours or so.
In the other side - this makes no sense because what I back up is about 250GB worth of data.
From the backup server to the Linux box - I can copy files at a rate of 10 Mb/s.
Attached is a graph of the entire backup process seen at the switch port
Appreciate any help in this matter.