Hello,
following configuration given:
Server 1: HP DL380G8, Dual Octa-Core-Xeon, 128GB RAM, 10 Samsung Server SSDs, HP Tape-Library (SAS) running Windows Server 2012 R2
Server 2: ICO Server, Dual Hexa-Core-Xeon, 64GB RAM, Multiple HDD RAIDs running Windows Server 2012 R2
Those 2 Servers are connected through HP ProCurve 3400cl-48G Switch.
The Problem: We have MS DPM running on Server 2 - iSCSI connected to HP Tape Library on Server 1 - Network-Saturation never goes over 40%.
With Jumbo-Frames deactivated we get 40-45MB/s - with enabled Jumbo-Frames we get about 45-50MB/s. (less Overhead = more MBs/ with same Network Saturation)
On Initiator Side we hat to set "[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-BFC1-08002BE10318}\{...}\Parameters]" - MaxTransferLength DWORD = 0x10000 (was 40000) to get Tape-Library running without Problems.
We also tried Starwind iSCSI-Initiator - but with this one it didn't work at all.
With direct attached Tape-Library we get over 100MB/s ... but with the 40-50MB/s we get now we can't Backup efficiently as the Backups start so stack up .... (30-40 Hour for backing up everything ... no daily Backups possible)
(Ports 5-6 is the connection between those 2 Servers - it's almost everytime at ~40% usage)
Is there any sort of Bandwith-Limitation on the Tape Redirector? Or does anyone have an Idea how to get the Speed up?
Thank you, bye from Austria
Andreas Schnederle-Wagner
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