Re: What is I/O?

Input/Output. Basically the disks are writing and reading a lot of data in a
short time when someone said a lot of I/O.

On 1/12/07, Burns, Bryan <Bryan_Burns@xxxxxxxxxxxx> wrote:

The term I/O is used a lot with respect to performance but I'm not sure
what it means.  Can someone give me a primer?  What does it mean to the
system if a job is doing "A LOT OF I/O"?  Doing a lot of reading and writing
to disk?  What can you do about it?  Would a batch query that's using a lot
of CPU be doing a lot of I/O too?  That, I could probably control.

What's a lot of I/O on a 9406 520 with 12 disk units?  I started an I-nav
monitor this morning and one of the I/O high points is 600 operations per
second.  Is this trivial?

Thanks,

Bryan Burns
IBM Certified Specialist - iSeries System Command Operations V5R2
M.I.S. Department
ECHO, Incorporated
www.echo-usa.com

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