First the User Guide. Leave a Reply Cancel reply Your email address will not be published. The host will not use the previous path for the particular datastore at that point in time until it is selected again. Notify me of follow-up comments by email. Notify me of new comments via email. This is Revision 9. From experience it is entirely acceptable that a particular datastore is accessed using one path at a time.

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I have seen extremely high IO driven from a single VM with very large block size. Please consult the user guide but to summarise, the main benefits are:. Notify me of follow-up comments by email.

Queuing in vSphere Also consider the different queues involved in the IO path: Email required Address never made public. Please consult the user guide but to summarise, the main benefits are: Save the file and then to apply the changes you have made to the multipath. To check the status of your configuration SSH to the XenServer host and run the mulfipath multipath -ll the output should be similar to the following output: This is Revision 9.

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Consider the job the nultipath is doing for a second.

I came across these documents yesterday as part of something I was doing. The default is IOPS. When the threshold set for the path is reached the host will switch to the next path. Leave a Reply Cancel reply Your email address will not be published. Sorry, your blog cannot hd posts by email.

HDS AMS Active-Active Multipathing | rhoodsy

You can install a VIB and use this to optimise storage performance in Hitachi storage environments. By continuing to use this website, you agree to their use.

As you can see both paths now have equal priority and the traffic will be balanced across the controllers. Consider this the threshold.

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To mmultipath out more, including how to control cookies, see here: The HDS AMS supports Active-Active multipathing, that is to say that both controllers send and receive data simultaneously rather than one live controller and one standby Active-StandbyCitrix XenServer out of the box however is setup for Active-Standby, reducing the throughput capability considerably.

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If are using Hitachi storage and are entitled to use HDLM then you should probably use it to get optimal performance and multi-pathing between the host-target. MRU Although some arrays need to use Fixed. This site uses cookies.

It is co-ordinating IO from multiple VMs, living on different data stores, on multiple different hosts. Show Header Sidebar Content. A quick Recap If are using Hitachi storage and are entitled to multi;ath HDLM then you should probably use it to get optimal performance and multi-pathing between the host-target.

Hitachi HDLM Multipathing for vSphere Latest Docs – Paul Meehan

Imagine a cluster with 20 hosts 2 HBAs per hosts datastores Thats a total of active devices each host is managing with multiple queues on top and underneath. You are commenting using your Facebook account. This is Revision The switching threshold can be either based on IOPS or bytes.