Date: Tue, 26 Feb 2013 10:11:14 +0100 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: freebsd-stable@freebsd.org Subject: Re: RFC: Suggesting ZFS "best practices" in FreeBSD Message-ID: <op.ws3vs0nj8527sy@ronaldradial.versatec.local> In-Reply-To: <512C6566.9040400@digsys.bg> References: <20130124174039.GA35811@icarus.home.lan> <CAFHbX1KsWa1JwvU0724owTBxV3ko5QQv4=3pKPyzeHvQBXL1qA@mail.gmail.com> <512B94EB.30201@denninger.net> <512C6566.9040400@digsys.bg>
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On Tue, 26 Feb 2013 08:33:58 +0100, Daniel Kalchev <daniel@digsys.bg> wrote: > > > On 25.02.13 18:44, Karl Denninger wrote: >> On 2/25/2013 8:31 AM, Tom Evans wrote: >>> Using GPT labels is easy to do, and provides a cast iron guarantee >>> that your disk will not EVER be mistaken for a different drive. >>> >>> I put a GPT label on the drive, and then write it in permanent marker >>> on the top of the drive and on a sticky label that is stuck on the >>> front of the chassis. The disk label never changes in its lifetime, so >>> you only get issues if you insert a drive without labelling it first. >>> >>> Cheers >>> >>> Tom >>> >> Listen to this man. Either do it in gpart or do it with glabel >> (depending on where you want it to show up); once done the drive will >> always have the same name in the device tree no matter what slot it >> shows up in. >> >> Then stick that label on the front of the drive carrier, and you never >> have this problem. >> >> Do that or suffer. Your choice. >> > > I can only second this advice. > > Learn to make your setups as generic as possible. Wiring down device > names using CAM etc, only complicates matters, at least because that > knowledge is contained within the system you boot, not the drive. If you > boot from an "recovery media", all of your "fine crafted" CAM wire-down > system will be gone and you will suffer. You will suffer exactly at the > moment when you need those labels most. Not wise. > Yes, Jeremy, there is always the first time. > > Both glabel and GPT labels do the trick. Both behave differently and > depending on your habits and intended usage one or the other is good. > Just don't be inclined to use both at the same time. My personal > preference as of later is GPT labels. > > By the way, "glabel" is a generic term in FreeBSD. It refers to all > label types, including those created with glabel, gpart and > newfs/tunefs. The later are not really "geom labels", these are volume > labels, but glabel is smart enough to detect/report them, even if it > can't manipulate these labels. I don't find the glabel documentation all > that confusing. > > Daniel I second that. Ronald
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