Date: Fri, 18 Aug 95 10:22:07 CDT From: imdave@ihats103.ih.att.com To: freebsd-questions@FreeBSD.org Subject: Re: ** How to add second SCSI disk ? ** Message-ID: <9508181522.AA02468@ihats103.ih.att.com>
next in thread | raw e-mail | index | archive | help
> > After fdisk and some partition definitions I am getting using > "disklabel -r sd1": > > # /dev/rsd1c: > type: SCSI > disk: sd1s1 > label: > flags: > bytes/sector: 512 > sectors/track: 32 > tracks/cylinder: 64 > sectors/cylinder: 2048 > cylinders: 80 > sectors/unit: 165856 > rpm: 0 > interleave: 0 > trackskew: 0 > cylinderskew: 0 > headswitch: 0 # milliseconds > track-to-track seek: 0 # milliseconds > drivedata: 0 > > 8 partitions: > # size offset fstype [fsize bsize bps/cpg] > a: 145856 20000 4.2BSD 0 0 0 # (Cyl. 9*- 80*) > b: 20000 0 swap # (Cyl. 0 - 9*) > c: 165856 0 unused 0 0 # (Cyl. 0 - 80*) > : : > > 3. If I change the order to > > # size offset fstype [fsize bsize bps/cpg] > a: 145856 0 4.2BSD 0 0 0 # (Cyl. 9*- 80*) > b: 20000 145856 swap # (Cyl. 0 - 9*) > c: 165856 0 unused 0 0 # (Cyl. 0 - 80*) > > Mount does not accpet it, "/dev/sd1a on /mnt: Incorrect super block.". Why? > As has been mentioned, a file system must be created before one can mount. However, when I added a new SCSI disk recently, I ran into a problem that I eventually thought I figured out: if I put swap at offset 0, then the disklabel info was written over as soon as the swap was used. If I put a filesystem at offset 0, then there seems to be some slop at the beginning of the filesystem which allows the disklabel info to remain and not be written over. Is this correct or did I somehow fix my problem but completely misunderstand what was going on? Dave Bodenstab imdave@ihats1.ih.att.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?9508181522.AA02468>