On Oct 2, 2012, at 2:04 PM, Eric Bielefeld <[email protected]> wrote:
> One thing no one else has mentioned is that one of the strengths of having > many disks is that you can be doing I/O on many more drives at the same time. > After all, you can only do 1 read or write from physical disk at a time. Of > course, with the huge amounts of cache, that changes. If your datacenter had > 100 TB of storage, and each physical disk stored 1 TB, you would only have a > maximum of 100 physical I/O's happening at any one point in time. Since most > data is not distributed equally, probably only 20-40 I/O's would be happening > at once. > > Just something to think about! With HiperPAV this is really only an issue for the back end of your storage controller, and as you say with enough cache it shouldn't be a problem even there. -- Curtis Pew ([email protected]) ITS Systems Core The University of Texas at Austin ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
