Legacy HDS Forums

Poor performance backing up to iSCSI target

Discussion created by Legacy HDS Forums on Aug 8, 2012
Latest reply on Aug 14, 2012 by Legacy HDS Forums

Originally posted by: Naveen Goud

I am seeing very poor performance backing up my Exchange server to iSCSI-based Backup-to-Disk.  Here are my details:

Media Server Type:  Virtual (ESX 4.1)

Operating System:  Windows Server 2008 R2 Standard - fully updated

iSCSI Appliance:  Dell MD-3000i

NIC Configuration:  (2) VMXNet 3 - one on the LAN and one on the iSCSI (isolated) subnet

Backup Exec:  2010 R3 fully updated (Version 13.0 Rev. 5204 64bit)

Note:  The Dell MPIO driver is installed and iSCSI is configured per Dell's recomendations for Server 2008 R2

Exchange to iSCSI B2D Speed:  550 MB/min

Exchange to C: B2D Speed:  1350 MB/min

Media Server to iSCSI B2D Speed:  1150 MB/min

Windows Explorer C: to iSCSI Speed:  3000 MB/min

In other words, if I back-up the Exchange server to the Backup-to-Disk folder on the iSCSI appliance I get less than half the throughput I get backing up to the C: Drive on the Media Server or backing-up the Media Server to iSCSI.  If I do a straight file copy using Windows Explorer I get about 3000 MB/min.  I'm not particularly impressed with 1 GB/min but I can work with that.  500 MB/min is painful for the size of our Exchange environment.  I've searched the forum and the internet and I have found other people with similar problems but no solutions. 

Any ideas out there?