I have a PowerEdge T420 that has issues with network write performance.
I am using LAN_speed utility to test writing a 20MB block of data from the PE T420 to a Synology DS415+ NAS.
The test shows write speeds of 10-22 MB but read speed is 485 MB.
When I test from other PCs on the network to the Synology NAS I get much better speed, so I ruled out the network switch and router.
The backupexec job runs at 14 MB takes forever to do a backup.
When I reboot the server all is fine for a while the lanspeed test are blazing fast and the backup speed is at 2300+ MB (2.3 Gbps) and holds steady for about 20-25 mins into the backup but then gradually you can see the speed of the backup slowing down by sometimes 1 to 10 MB until it gets down to around 13 -14 MB and stays there, read speed on verify are fine around 14. Gbps. Strange thing is all works well when server is rebooted but slow the write speed decreases
Win 2011 SBS Netgear FVS336G v2 vpn router Netgear GS 748T switch Broadcom NetXtrene Gigabit Ethernet Broadcom 9-4-12 15.4.0.17
Any ideas on troubleshooting would be appreciated.