Re: troubleshooting slow I/O performance.

From: Stefan Knecht <>
Date: Mon, 07 May 2018 16:54:39 +0000
Message-ID: <>

Some details would help:


On Mon, 7 May 2018, 21:00 Chris Stephens, <> wrote:

> We have a new 5 node 12.2 RAC system that is not performing the way we
> want.
> The glaring issue is that "db file sequential read"'s are taking ~10ms.
> before i lob this over to the storage administrators, are there any
> possible areas in the clusterware/database configuration that I should
> investigate first? i have root access to all of the nodes. is there any
> information i can collect that would expedite the process of figuring out
> why we have such slow I/O times?
> slow i/o was discovered by running slob. if you don't know about that
> tool, you should. we all owe kevin a debt of gratitude. ;)
> if nothing else, i hope to learn a little more about storage than i
> currently know (which isn't much).
> thanks for any help.
> chris

Received on Mon May 07 2018 - 18:54:39 CEST

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