IO wait

From: Jack Silvey <jack_silvey_at_YAHOO.COM>
Date: Tue, 23 Jul 2002 07:58:30 -0800
Message-ID: <F001.0049F7FB.20020723075830@fatcity.com>

All,

We are tuning a new vital process on our data warehouse, and it is IO intensive - lots of parallel direct reads and writes. During our testing we are driving IO wait to ~60% (per top).

questions:

1. is top a valid measure of IO wait?
2. Is a high io wait an issue to be concerned about?
3. how else can it be accurately measured?
4. How can I link IO wait to what is happening inside the database?

Thanks,

Jack

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Author: Jack Silvey
  INET: jack_silvey_at_yahoo.com

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