Date: Thu, 26 Nov 2009 04:29:17 -0600 From: Scot Hetzel <swhetzel@gmail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: Re: Can't use gpt labels re-importing pool Message-ID: <790a9fff0911260229u40d9f499w28a7ce46e1f92467@mail.gmail.com> In-Reply-To: <20091126085034.GA51998@icarus.home.lan> References: <4B0E3ABA.3030606@tzim.net> <790a9fff0911260040i1456d7c0j4f8327d24d2966cf@mail.gmail.com> <20091126085034.GA51998@icarus.home.lan>
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On 11/26/09, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > I'm a bit curious about something, so maybe someone can help me > understand: > > Why are people bothering with GPT labels (or in some cases, glabels) > when AHCI (whether it be ataahci.ko or ahci.ko) is in use? Under what > circumstance would the device name change dynamically in this situation? > There was a thread about this problem where the drives had changed their device names due to a change in the kernel drive (Current list from July): http://lists.freebsd.org/pipermail/freebsd-current/2009-July/009377.html Through out this thread there were various suggests on how he could recover the system, and prevent the problem from occurring in the future. One of the suggestions was that use of zpool replace to change from device names to using glabel labels. http://lists.freebsd.org/pipermail/freebsd-current/2009-July/009440.html > I've never witnessed this happening with AHCI, at least on Intel > systems, and I've hot-swapped hard disks many times over. > Using glabels, gpt labels, or gptid solves the problem of not needing to remember which device name the drive originally had. For instance, on a zfs zraid pool with 3 disks (ad1 ad2 ad3) you could disconnect the pool from one computer and connect it to another system and it wouldn't matter which order you reconnected the drives (1 2 3 or 3 1 2) as the pool would still be recognized when it is imported on the new system. Also if the new system already has drives ad1 and ad2, it wouldn't matter. Scot
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