Date: Thu, 08 Feb 2007 06:54:57 -0600 From: Eric Anderson <anderson@freebsd.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Ivan Voras <ivoras@fer.hr>, freebsd-geom@freebsd.org Subject: Re: New g_part class Message-ID: <45CB1DA1.3060003@freebsd.org> In-Reply-To: <9223.1170930805@critter.freebsd.dk> References: <9223.1170930805@critter.freebsd.dk>
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On 02/08/07 04:33, Poul-Henning Kamp wrote: > In message <45CAFA66.3030800@fer.hr>, Ivan Voras writes: >> Poul-Henning Kamp wrote: >>> In message <eqdfjm$5c3$1@sea.gmane.org>, Ivan Voras writes: >>>> span the whole disk, thus conflict with gmirror which wants to use the >>>> last sector. >>> And just how does "the last sector" not occupy the same sector as >>> the last sector of the last mounted partition ? >> A joke? :) >> >> (in case it isn't: that's the point: it DOES, so people can't create >> mirrors of live paritions. But, like I said, I realize there's no >> elegant solution). > > The correct solution is a lot of code, and all you gain is that > you save a single reboot. > > Ideal Computer Science Method: > > * use mount to tell filesystem to avoid last sector. > * use gctl to tell slicer to reduce parition by last sector > * implement new API so slicer can ask consumer (filesystem) > if reducing size is OK. > * use gctl to tell slicer to avoid last sector. > * use gctl to insert mirror class below slicer > * use gctl to tell mirror class to write metadata > > Practically Sensible Method: > > * boot single user (possibly from CD) > * use fsdb or growfs to reduce filesystem size I didn't realize growfs let you shrink file systems. I didn't see any mention of this in the man page either. If you know otherwise, can you please fill us in, and/or update the man page? Also - you are actually recommending using fsdb to modify a file system as 'practically sensible'? Heheh - that makes me giggle. > * reduce partition size > * use gmirror to write metadata > * reboot > This certainly has been an interesting thread so far... Eric
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