Date: Tue, 22 Oct 2002 10:48:14 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: BigBrother <bigbrother@bonbon.net> Cc: questions@FreeBSD.ORG Subject: Re: What do you do about your FFS fragmention? Message-ID: <20021022094814.GA8138@happy-idiot-talk.infracaninophi> In-Reply-To: <20021022120108.Q212-100000@bigb3server.bbcluster.gr> References: <20021022120108.Q212-100000@bigb3server.bbcluster.gr>
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On Tue, Oct 22, 2002 at 12:06:33PM +0300, BigBrother wrote:
>
>
> I know how the FFS (filesystem) works, and that it really does an excelent
> job in allocating clusters as local as possible. But it is also true that after
> some period of extensive use of it, the filesystem get fragmented, and
> results in severe degration of speed.
>
> One way is to dump/restore everything which is very painfull thing.
>
> -------
> So, what do you do [except dump/restore] to defrag the FFS after some time
> of extensive use? Or you dont care for the degration in speed?
Nope. You're thinking of Windows filesystems. So long as you don't
fill a filesystem to 100% or more, it will have sufficient space
reserved to be able to automatically defragment itself. No user
intervention required.
If you're seeing a gradual performance degradation over time on
FreeBSD it's more likely some other factor.
You can check the degree of fragmentation on a filesystem by rebooting
to single user and running fsck(8) on the unmounted filesystems. For
a typical filesystem you should see something less that the 1% mark.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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