![]() The reason we (Pure) recommended the change down to switching paths after every single I/O was for two many reasons: By changing what was called the I/O Operations Limit (sometimes called the IOPS value) you could realize a few additional benefits. The other option was to change paths after a certain amount of throughput, but frankly, very few went down that route.Ī popular option for tuning RR, was to increase the path switching frequency. So for a given device it would use one path for 1,000 I/Os, then the 1,001st I/O would go down a different path. The default configuration of RR was to switch logical paths every 1,000 I/Os for a given device. ![]() ![]() Round Robin was a great way to leverage the full performance of your array by actively using all of the paths simultaneously. This is VMware’s built-in path selection policy for arrays that offer multiple paths. Why was this PSP option introduced? Well the most common path selection policy is the NMP Round Robin. So what is it? Well first off, see the official words from my colleague Jason Massae at VMware here: In reality, this option was introduced in the initial release of 6.7, but it was not officially supported until update 1. ![]() This is my first (but certainly not last post) on the new path selection policy option in vSphere 6.7 Update 1.
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