Issues of multichannel policy parameters

Hi all

How it the multipath initially set to data warehouses? Storage decide? We could see performance degraded the latency of IO, and a representative of support 3PAR recently suggested changing the Round Robin of the value default MRU we ran on the LUNS of 3PAR. I don't know how this will help because I don't think that Round Robin has been link aggregation, turning rather just paths to push the e/s down.

Anyway, when I checked my paths of an EMC device, we also, they were already the Round Robin value, so I was wondering if the table defines this and if yes, why 3PAR suggests something different from their table defines by default.

Hello sel57,

By default, ESXi checks the type of storage, then depending on the type of storage it sets the default policy that is ideal for this type of storage. For more information, you can check the following:

Chapter 23: Understanding multipath and failover

http://pubs.VMware.com/vSphere-55/topic/com.VMware.ICbase/PDF/vSphere-ESXi-vCenter-Server-551-storage-Guide.PDF

Also, you can check the link HCL. For each storage vendor, the type, the Firmware version and the version of ESXi, there is a suggested path selection policy. So according to storage provider, type, Firmware version, and esxi version the best access path selection policy is enabled by default.

VMware Compatibility Guide: search for storage/SAN

For example, in the link above, I searched for EMC and ESXi 5.5 U1.

So, in summary, the default value is set and tested and the time to begin the best appropriate policy is selected. Is there is no specific reason or suggestion of the storage provider then only you must modify the default policy or not.

Hope that answers the question.

Tags: VMware

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