Pool and the Volume of data latency does not match the SanHQ

Using some PS6000 (Sata and SAS) as a back-end for ESXi and looking at the graph view on SanHQ and the raw data on export, but I'm not able to give a sense of latency information.

Generally for fields, the data in the column pool or member matches very closely to the sum of the parts of the volume (for IOPS / s, flow, read, write, etc.)

However, latency is not, nor is he anywhere near average either.

In the graphical display we noticed high (20-40 ms) latency playback of our pools and members, but the volumes that make up these pools are all less than 10ms. During a storage vmotion, we will see a huge spike in IOPS / s and latency and sizes KB will drop to almost nothing during the copy rebound back at high levels as the traffic goes down.

Makes a lot of sense to me (except perhaps if seq I/O is reduced to deal with latency)

To monitor latency, it seems that I need to watch the largest volume of latency of a given pool, but not the pool itself or asymmetric information.

I would get a few reports of MS Log Parser against export CSVs, but I need to make sense of this first. Latency is a KPI is no not a lot of sense.

When you see the IOPS rise and the latency goes down, it's actually a normal thing. It is called Nagle algorithm. It makes pretty much the TCP packets wait until they are full before sending them. Here is a document that can be useful, what explains the algorithm more in detail.

http://SearchNetworking.TechTarget.com/definition/Nagles-algorithm

Until reporting problem you're talking about I would recommend making sure that the last FW is installed on all members of the Group and ensure well the last version of SAN HQ are also installed. Just curious you have configured replication? I can't wait to hear back on your part.

Tags: Dell Tech

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