So I have an odd speedissue that I'm attempting to troubleshoot from as many angles as possible.
1 Physical Backup Server - Dell T620 32GB ram, 2 6 Core Xeon Processor, Broadcom 5719 Nic for iSCSI, MD1200 DAS as backup repository
Compellent San with 8 1Gb links across 2 SC40 controllers - all paths active. 2 Disks shelves 1 with 24 10K 400GB sas 1 with 12 4TB 7.2K disks.
Nexus 3048 Switches with 2 vlans for iSCSI 1 vlan for vmotion and 1 vlan for normal data traffic
The veeam server is ONLY doing veeam currently - DPM in the not too distant future. MPIO is setup and working. I've adjusted some registry settings for timeout etc... per compellent documentation. Direct San is working correctly between the veeam server and the SAN.
The problem is, I can't get more than 32MB/s when running a backup job that has one VM in it. Likewise, if a backup contains many VMs, once the bulk are done, the speed plummets.
I can get the Compellent to reliably give out 300MB/s+ when running 12 VM's at once - but that doesn't last long as the smaller VMs in the job start to finish.
The resources on the server seem to barely be getting touched, I've adjusted and tried a myriad of settings on the broadcom nics and can't seem to get anywhere with that. Jumbo Frames are enabled all the way through the path, flow control enabled, etc... I've used veeam for years with less advanced/expensive/'fast' SANs and never had backup throughput this bad. We've got 10Gb network coming for the SAN and backup server... but I'm afraid I won't see any gains given the poor performance I've described above. I've only got two ideas left:
1. Replace the physical broadcom nic with an identical one
2. Try using one of the two onboard intel nics and see if there's any difference.
Does anyone have any ideas? This is getting to be unbearable when doing full backups with large VM's. From the SANs point of view it is using less than 1 7.2K disk worth IOPS when running my test backup job with a single VM in it. :/ If I tell the server to just use network mode (so it's really only using 1 1Gb nic) I'm getting 45-50MB/s through the VM management network. Thanks for any ideas!