Date: Thu, 30 Jul 2009 21:04:59 +0200 From: Roland Smith <rsmith@xs4all.nl> To: PJ <af.gourmet@videotron.ca> Cc: freebsd-questions@freebsd.org Subject: Re: how to boot or access problem file system Message-ID: <20090730190458.GA36265@slackbox.xs4all.nl> In-Reply-To: <4A71DB2A.4040401@videotron.ca> References: <4A71DB2A.4040401@videotron.ca>
next in thread | previous in thread | raw e-mail | index | archive | help
--mYCpIKhGyMATD0i+ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jul 30, 2009 at 01:40:58PM -0400, PJ wrote: > What can be done to access a file system that seems to have the boot > sector screwed up? Do you mean the filesystem's superblock? Or the slice table (partitions in PC parlance) or the freebsd partitions (disk labels)? Because the boot sector is not part of any filesystem.=20 The best way to try repairs is to make a complete copy of the partition with dd(1), and experiment on the copy. That way you cannot further screw up the original! To check a UFS filesystem, use fsck_ffs(8). First, try if the preen option '-p' is sufficient to fix the filesystem. If the superblock is corrupt, try using the -b option to specify an alternate superblock. See the manual page. > The /usr files should be ok but how to access? Use fsck_ffs to try and repair the filesystem. > I get errors that the file system is full and I have no idea of how to > deal with the boot up - the help message is no help! > Boot says it cannot find a kernel... surely there must be some kind of > recovery process even if nothing has been backed up. Surely FreeBSD must > be have something that functions like certain software does on MS ? Maybe the sleuth kit (sysutils/sleuthkit) can help you recover files.=20 > I don't have a problem with irrecoverable files, I would just finally > understand how things work and what can be done on FBSD. Make regular backups. Especially before big upgrades. Roland --=20 R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725) --mYCpIKhGyMATD0i+ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (FreeBSD) iEYEARECAAYFAkpx7toACgkQEnfvsMMhpyXrpwCfYBS/yv3xZ2G23roo8uWczVWs H94Amwefm4R7s/7JUWT5kNai/xWOH9QY =CWMj -----END PGP SIGNATURE----- --mYCpIKhGyMATD0i+--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090730190458.GA36265>