RE: Large systems and full disks

Pete Massiello wrote:

Cache is King no doubt about that, but arms are almost as important.

It is by far the most important part of I/O, because the I/O is
complete when i5/OS writes your application's I/O to the cache. At that
point, now the disk controller takes over and needs to write from cache

to

the disks. If you don't have enough arms though, you will see that you
can't get the stuff out of cache quick enough, which produces another
bottleneck. Therefore, you need the right number of arms and cache.

We completely agree. I don't claim to have the experience in this area to
evaluate this independently, and recommend getting expert advice.

Steve

- -
Steven Morrison
Fidelity Express




Confidentiality Statement: This electronic mail transmission is
confidential, may be privileged and should be read or retained only by the
intended recipient. If you have received this transmission in error,
please notify the sender immediately and delete it from your system.