troubleshooting Question

iSCSI Speed - Why so inconsistant?

Windows NetworkingNetworking Hardware-OtherWindows Server 2008Dell
10 Comments1 Solution324 ViewsLast Modified:
I have created tow SANs using OPEN-E for an Active -Active High Availablility Failover. I also Have created a Microsoft 2008 Cluster R2. I have two iscsi ports in each 2008 Server Node.

On Node A - I was able to grab a 7GB file and copy and paste it to my desktop in 12 seconds. It showed 500+ MBs a second.

However on Node B - I am only able to get 120 MBs a second and it takes 45 seconds to copy the same file. The two nodes are the exact same spec, processor, memory, etc...

Nic settings are the same. I used dells recomendation to set up iSCSI network accept for Jumbo frames and the Netsh commands.

I double checked the cards i didn't miss anything. The switches that are used in the high availability setup are the same.

I stopped and restarted the cluster and now Node one no longer copies at 500mbs a second. Now it only copies at 120mbs and takes 45 seconds to copy the same file.

What's weird is when it was copying at 500mbs a second I couln't see any iSCSI traffic on the TASK MANAGER NEtwork monitor tab and it said 0% under iSCSI Nics during the lightning fast copy . Now I can see the graph during the slower copy and it shows about 55%.

Can this be explained. I am using MPIO.
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