Date: Mon, 29 Sep 1997 15:33:03 +0930 From: Greg Lehey <grog@lemis.com> To: Donn Miller <dmm125@bellatlantic.net> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: "df" estimates are off Message-ID: <19970929153303.59702@lemis.com> In-Reply-To: <Pine.NEB.3.96.970929011000.28104B-100000@myname.my.domain>; from Donn Miller on Mon, Sep 29, 1997 at 01:13:06AM %2B0000 References: <Pine.NEB.3.96.970929011000.28104B-100000@myname.my.domain>
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On Mon, Sep 29, 1997 at 01:13:06AM +0000, Donn Miller wrote: > Hello, > > Recently, I've noticed that the df command has been showing negative disk > space, and was wondering how far negative it could go until the /usr > partition was full: > > Filesystem 1K-blocks Used Avail Capacity Mounted on > /dev/wd0a 48431 39551 5006 89% / > /dev/wd0s1 423072 392984 30088 93% /dos > /dev/wd0s4e 548911 526867 -21868 104% /usr > procfs 4 4 0 100% /proc > > But then I noticed that, for /usr, it shows -21868 avail, but when doing > the math, 22044 is actually available. For /, shows 5006, but act. free > space is 8880. ufs allows users access to only 90% of the total space on disk. The rest is reserved for root. To make it more confusing, the 90% mark can be changed with tunefs(8), so the designers chose to refer to whatever this mark is as 100%. Under normal circumstances, this means that root can pump the file system up to 111% of its nominal capacity. This is *bad*, especially on /usr, since no normal user can write to the disk any more. > The disk usage for /dos is right on target. This suggests that /dos is not ufs. > Is it because df is allowing for a 'safety margin' of free space, or do I > need to reboot or rebuild some database or something? You need to remove some data, or you'll run into trouble. Greghelp
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