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Date:      Wed, 04 Feb 2009 22:54:57 -0700
From:      Tim Judd <tajudd@gmail.com>
To:        Yavuz <maslak@ihlas.net.tr>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: is there any way to increase disk performance ?
Message-ID:  <498A7F31.30206@gmail.com>
In-Reply-To: <1E37AE87F15C4E34B6EB1002AADEB87A@desktop2002>
References:  <1E37AE87F15C4E34B6EB1002AADEB87A@desktop2002>

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Yavuz wrote:
> I have freebsd7 (amd64 bit)  and sata2 disk 7200 rpm.
> 
> it's running mail server which has services like pop3,imap,smtp and 
> webmail on this machine.
> 
> When I type systat 1 -vmstat on command line, even I rarely see that 
> disk usage hits 100%.
> I have no problem as ram and cpu.  they is enough.
> 
> is there any way to increase disk performance without causing any problem ?
> 

So in one second, the disk hits 100% utilization, weather it's reading 
or writing data to disk.  You said above that "I rarely see" -- so even 
though, as a server, you're running slow spindles, you are doing pretty 
good.

I've no real experience with a site that's (for example) been 
slashdotted, to test what is tolerable, and what's not.  But as I 
currently guess, an OVERALL average between 25% to 33% is about as much 
as I would ever tax a server for CONSISTENT averages.

So if you're seeing it rarely, such as when somebody hits webmail and 
takes 1 second of constant disk read to serve the content, I'd be happy 
there...

I don't think you have a problem, when you put your concern into the 
broader scope of 1 minute, 1 hour, 1 day or 1 week.  It'll be very 
difficult to never see 100% in 1 second no matter how powerful the 
machine is.


HTH
--Tim



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