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List:       smartmontools-support
Subject:    Re: [smartmontools-support]Does self-tests reduce disk IO performance
From:       "Michael Mansour" <mic () npgx ! com ! au>
Date:       2006-02-16 22:30:30
Message-ID: 20060216222910.M34036 () npgx ! com ! au
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Hi Denis,

> Question not affected smartmontools directly, but I believe it's the
> best place to know something for what I couldn't find a trustworthy
> answer anywhere.
> 
> Will short and long self-tests reduce HDD performance (theoretically 
> and practically)?  Are tests suspended while disk does other IO operations?
> 
> Should I try to run these tests in the hours of the least load, or 
> is it OK to run them whenever I wish?

From my experience, short tests can be run pretty much anytime, but long tests
should only be run in least load or after hours. Thrashing of the drive does
occur on a long test, and if the drive is already busy, then contention will
occur.

Michael.


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