Saturday, December 22, 2012

Monitor Storage Spaces bottleneck


Introduction
In order to run a system, we need to have a cpu, memory, network and also the disk.  The most challenging part to view on the this 4 component will be the disk component. Let me explain , if we are checking on the cpu, we will check whether it hits 100% of CPU usage. This goes the same to the memory, as we can check the balance of the memory in the task manager. For network part, mostly we will check on the byte sent out or byte sent in, however in a bigger environment, the latency of the network will need to take into consideration. Why I said the disk, is the most crucial part. The more application or VM you run on the disk, it will became slower and slower, but what is the right measurement for it?. I will explain more in detail

Disk monitoring
Windows Resource monitor it is a free tools from Microsoft that give you a very good glance on the overall performance of the system. I will explain on the area that you need to take note. The area when you would like to check will be the storage area. The thing that we are covering here is to check the disk whether it got the enough spindle to cope with the workload.

The areas that we are looking at will be the average disk queue length. Mostly people will said high disk queue length will cause the performance of the system is slow. But then again what is the right measurement. Base on the experience, the average disk queue length of 2-4 in a single subsystem, this is consider normal. But if its go beyond 4 it mean there is more disk to be added. Let said you have a 10 disk that are configure over a raid and you get the value of 20-30, this is consider fine.

Other matter will be the memory as well if you don't have enough memory which could cause a lot of paging in the disk. With the flexibility on the storage spaces which are introduce in windows server 2012 , the issues on extending the disk it is much more simpler.

Summary
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