Today
let’s take a look at the two distinct aspects of data storage.
Data can
come from all different directions to the disk.
Disk occupancy
Disks used
to be very expensive but now the costs have come down dramatically and this
cost factor has accelerated the growth of storage.
You may
have too little storage resulting in out of disk space problems but conversely
you may have storage over-allocated. A lot of times people put excessive
storage space out there to ensure that they never run out and don’t pay
attention to how much they really need and what their growth really is going to
be.
Below is a typical service center queuing diagram
Disk
Performance Capacity
Response,
IOPs
In many cases the requests are being sent out by an
application or applications. There is a finite limitation on the requests per
second that can be satisfied and then a queue begins to form. The queuing
theory comes in to play where you have limitations on the throughput of your
I/O and at some point this will have a response impact. The response impact
transfers up through the application to the user and results in a slow response
time, a performance problem.
On Friday I’ll be looking at space utilization, in the meantime why not sign up to our Community and get access to our great resources, free white papers, on-demand webinars and more.http://www.metron-athene.com/_resources/index.html
Dale Feiste
Principal Consultant
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