Date: Wed, 23 May 2007 10:10:06 +1000 From: Mikhail Goriachev <mikhailg@webanoide.org> To: "illoai@gmail.com" <illoai@gmail.com> Cc: Kevin Downey <redchin@gmail.com>, freebsd-questions@freebsd.org Subject: Re: Assignment of device names to external USB drives Message-ID: <4653865E.1090804@webanoide.org> In-Reply-To: <d7195cff0705221142l3697b73dg23ceb93f5c45912@mail.gmail.com> References: <464F6917.9080301@acm.org> <1d3ed48c0705191728s54ef146do63d5186bcf8e9e8b@mail.gmail.com> <d7195cff0705221142l3697b73dg23ceb93f5c45912@mail.gmail.com>
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illoai@gmail.com wrote: > On 19/05/07, Kevin Downey <redchin@gmail.com> wrote: >> On 5/19/07, Denis Fortin <fortin@acm.org> wrote: >>> Greetings, >>> >>> I am trying to set up a backup server, using a combination of internal >>> and external (USB) disk drives. >>> >>> How can I manage the mapping of USB disk drives to device names? i.e. >>> USB drives get assigned device names like da0, da1, da2... when they are >>> detected. But if one of the drives fails or is not powered up, all >>> other ones will get bumped down one in the list next time I reboot. >>> >>> The problem is that if I automatically "mount /dev/da0a >>> /archive/volume1", "mount /dev/da1a /archive/volume2", etc. I run the >>> risk of having the wrong disk being mounted on a mount point !?! >>> >>> Is there an obvious solution that I'm missing, or a canonical workaround >>> to this problem? >>> >> when you newfs a drive use the -L flag to give it a label like >> 'VOLUME1' then if you load the geom_label module that drive becomes >> availble under /dev/ufs/VOLUME1 > > Or, if instead of fdisk, you > # glabel label disk0 da0 > # bsdlabel -w label/fancy0 > # newfs -U label/fancy0a > # mount /dev/label/fancy0a /bla > In addition, you can modify an already created filesystem (as described in glabel(8)): # tunefs -L data /dev/da4s1a Read the glabel(8) and loader.conf(5) man pages. Regards, Mikhail. -- Mikhail Goriachev Webanoide Telephone: +61 (0)3 62252501 Mobile Phone: +61 (0)4 38255158 E-Mail: mikhailg@webanoide.org Web: www.webanoide.org
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