Date: Mon, 3 Nov 2003 11:11:14 +0100 From: Elessar <elessar@galgenberg.net> To: Odhiambo Washington <wash@wananchi.com> Cc: freebsd-questions@freebsd.org Subject: Re: How does FreeBSD calculate disk sizes Message-ID: <20031103111114.7beefac9.elessar@galgenberg.net> In-Reply-To: <20031103090715.GC20234@ns2.wananchi.com> References: <20031103090715.GC20234@ns2.wananchi.com>
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--Signature=_Mon__3_Nov_2003_11_11_14_+0100_C0v/e/XNOo.x1POE Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: 7bit Hi On Mon, 3 Nov 2003 12:07:15 +0300 Odhiambo Washington <wash@wananchi.com> wrote: > Hello users, > > I have a disk which is actually 72GB. 2GB has been used as swap while > the rest was given to /. Well, 72GByte in the manufacturer's notation which is decimal. So your disk has 72 * 10^3^3 (= 72'000'000'000) Bytes. freeBSD works - like every other OS i know - not decimal but dual. Therefor the disk has 67.055225 * 2^10^3 (= 72'000'000'000) Bytes. > sucks# uname -nmr > sucks.wananchi.com 5.1-RELEASE-p10 i386 > > sucks# df -h > Filesystem Size Used Avail Capacity Mounted on > /dev/da0s1a 64G 1.8G 57G 3% / > devfs 1.0K 1.0K 0B 100% /dev Here we have our 67GiByte disk without the 2GiByte Swap, and a little bit of unused space due to Sector 63 thingies. So da0s1a ends up having 64GiByte of which iirc 8-10% are reserved and used for filesystem optimizations. Makes 57GiByte available with 3% (or 1.8Gi) being used. So everything is there, it's just a little math. And yes, it's quite a pain in the ass, but you will get used to it ;] Joerg --Signature=_Mon__3_Nov_2003_11_11_14_+0100_C0v/e/XNOo.x1POE Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQE/pinMIrY0CTTJX8ARAtImAJ9V7Sr+h1DxUVuCBvFc2rhoTH7MBwCePRPk A5/YlYelqhpxW1TqijQr0s8= =cduL -----END PGP SIGNATURE----- --Signature=_Mon__3_Nov_2003_11_11_14_+0100_C0v/e/XNOo.x1POE--
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