RE: IO wait

Some large jobs do run throughout the day and I am sure the average of 4 blocked processes is a result of I/O waits. I am sure that if I posted on some of the NIX lists I could get some kind of commands that would dig down for me but since performance is fine and I am really really busy I will let it go. Yes this was an AIX box.

Ethan Post
perotdba (AIM), epost1 (Yahoo)

-----Original Message-----
Sent: Wednesday, July 24, 2002 1:56 PM
To: Multiple recipients of list ORACLE-L

Hi Ethan,

I assume this is from an AIX box (right?)

Some remarks: (not an answer!) The first line of vmstat/iostat output is an average since restart. The 'wa' is 32 and you have 4 processes blocked on average. Was there a problem (or a large load) since your last restart that was since solved? If not, this may just be the average load... On the other hand, you aren't currently paging in/out nor have an abnormal amount of context switches (cs) or system calls (sy), so why should two processes be "blocked for resources I/O, paging, and so forth" (as per man page). Worth investigating! Unfortunately, *NIX does not provide the equivalent of V$ views so we really cannot dig into the details.

Hth,
John Kanagaraj
Oracle Applications DBA
DBSoft Inc
(W): 408-970-7002

Want to know about a carpenter who built a bridge with two sticks and three nails? Write me for details!

• The opinions and statements above are entirely my own and not those of my employer or clients **

> -----Original Message-----
> From: Post, Ethan [mailto:Ethan.Post_at_ps.net]
> Sent: Wednesday, July 24, 2002 11:18 AM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: IO wait
>
>
> kthr memory page faults cpu
> ----- ----------- ------------------------ ------------ -----------
> r b avm fre re pi po fr sr cy in sy cs us sy id wa
> 0 4 754461 3196 0 15 12 299 242 0 596 448 294 53 17 99 32
> 0 2 754461 3195 0 0 0 0 0 0 503 1672 123 0 0 99 0
> 0 2 754461 3195 0 0 0 0 0 0 509 787 125 0 0 99 0
> 0 2 754461 3171 0 0 0 0 0 0 540 830 148 0 1 98 1
> 0 2 754461 3167 0 0 0 0 0 0 503 783 120 0 0 99 0
>
> John,
>
> I think I recall some references in the past that would state
> that what you
> see above is a problem (the 2 blocked processes in the "b"
> column). However
> we are not suffering any type of obvious problems that I am
> aware of. Is
> there a way to determine what these processes are?
>
> Ethan Post
> (972) 577-6552
> Ethan.Post_at_ps.net
> perotdba (AIM), epost1 (Yahoo)
> --------------------------------------------------------------------

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