Microsoft iscsi initiator emc clariion

Post by Gostev » Sun Mar 15, pm this post. Post by silverfoxs » Tue Mar 17, am this post. Post by Gostev » Tue Mar 17, pm this post. Privacy Terms Cookie Settings. Quick links. I couldn't find this doc. Is that possible you can provide link for me? Someone else has posted this resolution, and I've just copied and stickied it here.

In these situations, the default millisecond delay on the acknowledgement cansignificantly impact read bandwidth.

PowerPath, by load balancing read requests across multiple array ports, increases the likelihood that simultaneous read completions from multiple ports will result in network congestion.

This increases the likelihood of experiencing the problem. Instead of sending an acknowledgment for each TCP segment received, TCP in Windows and later takes a common approach to implementing delayed acknowledgments.

Typically, an acknowledgment is sent for every other TCP segment that is received on a connection unless the delayed ACK timer milliseconds expires. You can adjust the delayed ACK timer by editing the registry as outlined in the workaround below. This workaround solves the read performance issue. Follow directions appropriate for the version you are running on your servers.

Microsoft iSCSI clusters also require array software revision 3. First answer to your question is only partially correct so I'll comment on answering to it directly. Give a try to a link below. Here we are:. If your array is not capable to do anything better then 10 ms - dump it!

It's not going to work reliably. Here's an example:. If you cannot test everything or something listed above with your hardware replace production array temporary with a software target to tune and check rest of your storage network BTW, that's why I personally prefer software solutions running on a commodity hardware and not some hardware-lock-in-a-box solution - there's no way to get inside it and find out what's broken.

On practice it's neither always possible nor always required overkill. Having fraction of traffic on one lane reserved for non-SAN stuff is not an issue. It's not anymore. Compare the numbers for thru-output, latency and CPU utilization. You'll hardly notice anything except measurement error. Office Office Exchange Server. Not an IT pro? Windows Server TechCenter. Sign in. United States English. Ask a question. Quick access.