Date: Tue, 21 Mar 2006 12:10:58 -0500 From: Mike Jakubik <mikej@rogers.com> To: Craig Boston <craig@feniz.gank.org>, Freddie Cash <fcash@ocis.net>, stable@freebsd.org, pjd@FreeBSD.org Subject: Re: gmirror on existing filesystem (was Fresh install on gmirror'ed disks?) Message-ID: <442033A2.2030208@rogers.com> In-Reply-To: <20060316160813.GA15720@nowhere> References: <440D74B3.3030309@vwsoft.com> <200603070939.30032.joao@matik.com.br> <54559.192.168.0.10.1141751042.squirrel@webmail.sd73.bc.ca> <20060316160813.GA15720@nowhere>
next in thread | previous in thread | raw e-mail | index | archive | help
Craig Boston wrote: > On Tue, Mar 07, 2006 at 09:04:02AM -0800, Freddie Cash wrote: > >> There's no need to copy files around. gmirror handles it all for you >> behind the scenes. Just create the gmirror labels using the existing >> disks/slices/partitions, then insert the second set of >> disks/slices/parittions. gmirror will handle synchonising the data >> across the mirror. >> > > AFAIK, gmirror causes whatever provider it's mirroring to "lose" the > last block to metadata. I've always avoided mirroring an existing > filesystem for fear that shrinking a UFS filesystem's underlying device > might cause problems down the road. > > Can someone with knowledge of the UFS internals please confirm one way > or the other if this is dangerous or not? > I'm curious to know this as well, as i have some systems using gmirror, that were setup in this fashion. Could someone knowledgeable on the matter shed some light?
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?442033A2.2030208>