Date: Sat, 26 Jun 2004 14:07:03 +0200 (CEST) From: Lukas Ertl <le@FreeBSD.org> To: Daryl Chance <chancedj@yahoo.com> Cc: current@FreeBSD.org Subject: Re: geom_vinum problems (crashes and lockups) Message-ID: <20040626135735.E666@korben.in.tern> In-Reply-To: <20040625013138.54319.qmail@web53710.mail.yahoo.com> References: <20040625013138.54319.qmail@web53710.mail.yahoo.com>
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On Thu, 24 Jun 2004, Daryl Chance wrote: > for /dev/ad4s1: > mp3# bsdlabel /dev/ad4s1 > # /dev/ad4s1: > 8 partitions: > # size offset fstype [fsize bsize bps/cpg] > c: 60074784 0 unused 0 0 > d: 60074784 0 4.2BSD 2048 16384 28512 This is a situation that I currently consider 'unsupported'. The problem is that the 'd' partition has no offset, thus it is (from the point of view of a geom_vinum drive geom) the same as the 'c' partition. This is the first problem. The second problem is the on-disk format of a bsdlabel. As far as I understand it, this meta-data is stored inside the first partition, so when you open the drive for writing (i.e. mount, fsck) you trigger a spoil event which cause all kinds of confusion for geom_vinum. I'm not sure if I find a proper hack for this, so, for now, this is an unsupported configuration. This means that the partition where you want to put a vinum drive on _must not_ start at the beginning of a drive and has to have an offset, i.e. 16 sectors, as a standard label from 'bsdlabel -w' has. cheers, le -- Lukas Ertl http://homepage.univie.ac.at/l.ertl/ le@FreeBSD.org http://people.freebsd.org/~le/
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