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Date:      Fri, 03 Nov 2000 06:39:47 -0800
From:      Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>
To:        Matt Dillon <dillon@earth.backplane.com>
Cc:        Dag-Erling Smorgrav <des@ofug.org>, Marius Bendiksen <mbendiks@eunet.no>, Randell Jesup <rjesup@wgate.com>, arch@FreeBSD.ORG
Subject:   Re: Like to commit my diskprep 
Message-ID:  <200011031440.eA3Eebp39614@cwsys.cwsent.com>
In-Reply-To: Your message of "Fri, 03 Nov 2000 02:14:51 PST." <200011031014.eA3AEpV45562@earth.backplane.com> 

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In message <200011031014.eA3AEpV45562@earth.backplane.com>, Matt Dillon 
writes:
> 
> :> This is a matter of preference (hence the reference to paint) and also the
> :> use intended for the system in question. However, the code is not going to
> :> be significantly more complex due to this, and I think it's a much better,
> :> ie cleaner, way of doing it.
> :
> :One question that probably interests many of us is, can tuning those
> :numbers reduce fsck time? Is fsck time strictly proportional to disk
> :size, or does the number of inodes and/or cylinder groups affect it?
> :
> :DES
> :-- 
> :Dag-Erling Smorgrav - des@ofug.org
> 
>     Yes.  Increasing the number of bytes per inode will reduce the number
>     of inodes and thus reduce fsck time.  Increasing the number of cylinders
>     in a group will localize inodes into bigger chunks, reducing seeking
>     and also thus reduce fsck time.

Wouldn't that tend to generally reduce day-to-day performance as well?  
I suspect that Kirk and co. at CSRG had a good reason for choosing the 
defaults they did.


Regards,                       Phone:  (250)387-8437
Cy Schubert                      Fax:  (250)387-5766
Team Leader, Sun/DEC Team   Internet:  Cy.Schubert@osg.gov.bc.ca
Open Systems Group, ITSD, ISTA
Province of BC





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