Date: Wed, 4 Dec 2013 13:31:05 -0500 From: "illoai@gmail.com" <illoai@gmail.com> To: Erich Dollansky <erichsfreebsdlist@alogt.com> Cc: "freebsd-questions@freebsd.org" <questions@freebsd.org> Subject: Re: Minimum size of a UFS partition Message-ID: <CAHHBGkqduFgWCv99ekfyY6bs9tEkktBhrP%2BXEoJq29XTNFqdEw@mail.gmail.com> In-Reply-To: <20131204185343.232cb68e@X220.ovitrap.com> References: <20131204155907.38ab9f72@X220.ovitrap.com> <20131204111541.97550134.freebsd@edvax.de> <20131204185343.232cb68e@X220.ovitrap.com>
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On 4 December 2013 05:53, Erich Dollansky <erichsfreebsdlist@alogt.com> wrote: > Hi, > > On Wed, 4 Dec 2013 11:15:41 +0100 > Polytropon <freebsd@edvax.de> wrote: > >> On Wed, 4 Dec 2013 15:59:07 +0800, Erich Dollansky wrote: >> > Hi, >> > >> > does anybody know how small a partition for UFS can get? >> > >> > I would need a very small partition of even below 1.44 MB. >> >> That should be possible by applying specific options to newfs > > with the other tip, I came to a size of 1MB for the given application. > > Erich A bit of experimentation: # mdconfig -s 2048 md0 # newfs -O 1 -b 4096 -f 4096 -i 16384 -s 4 /dev/md0 Filesystem size 0 < minimum size of 8 # newfs -O 1 -b 4096 -f 4096 -i 16384 -s 40 /dev/md0 Filesystem size 5 < minimum size of 8 # newfs -O 1 -b 4096 -f 4096 -i 16384 -s 64 /dev/md0 /dev/md0: 0.0MB (64 sectors) block size 4096, fragment size 4096 using 1 cylinder groups of 0.03MB, 8 blks, 32 inodes. super-block backups (for fsck_ffs -b #) at: 32 first cylinder group ran out of space # newfs -O 1 -b 4096 -f 4096 -i 16384 -s 80 /dev/md0 /dev/md0: 0.0MB (80 sectors) block size 4096, fragment size 4096 using 1 cylinder groups of 0.04MB, 10 blks, 32 inodes. super-block backups (for fsck_ffs -b #) at: 32 first cylinder group ran out of space # newfs -O 1 -b 4096 -f 4096 -i 16384 -s 96 /dev/md0 /dev/md0: 0.0MB (96 sectors) block size 4096, fragment size 4096 using 1 cylinder groups of 0.05MB, 12 blks, 32 inodes. super-block backups (for fsck_ffs -b #) at: 32 So, the answer is: pretty small! Cheers. -- --
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