Date: Sat, 7 Feb 2004 07:59:50 +1100 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Claus Guttesen <cguttesen@yahoo.dk> Cc: freebsd-current@freebsd.org Subject: Re: Reserved space (WAS: How to calculate bsdlabel size) Message-ID: <20040206205950.GU908@cirb503493.alcatel.com.au> In-Reply-To: <20040206084458.53207.qmail@web14101.mail.yahoo.com> References: <20040206072244.GT908@cirb503493.alcatel.com.au> <20040206084458.53207.qmail@web14101.mail.yahoo.com>
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On Fri, Feb 06, 2004 at 09:44:58AM +0100, Claus Guttesen wrote: >>> But it's not my problem. What you mean results in >>> limited available space, >>> but doesn't have any influence on Size summary. >>> Btw I did a newfs with -m 0 >>> so it can't be the reaseon. >> >> This is strongly non-recommended. The UFS >> algorithms are designed on >> the assumption that there are always free blocks. >> When you get below >> 5-10% free space, the performance will degrade >> significantly and you >> will start getting file fragmentation. >> > >Does the algorithm(s) rely only on percentage of free >space? On a five TB (netto) filesystem eigth percent >is approx. 410 GB which seems quite alot. In general, yes. See /usr/share/doc/smm/05.fastfs/paper.ascii.gz You might be able to get away with a lower minfree in some circumstances depending on your filesystem activity pattern. Peter
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