Date: Wed, 14 Dec 2011 15:20:08 -0600 From: Rob <lists@midsummerdream.org> To: perryh@pluto.rain.com Cc: cyberleo@cyberleo.net, ryallsd@gmail.com, freebsd-questions@freebsd.org Subject: Re: AHCI driver and static device names Message-ID: <4EE91308.8050300@midsummerdream.org> In-Reply-To: <4edb4b48.LvOhZvvsP1inJeps%perryh@pluto.rain.com> References: <4ED98E9F.9010401@midsummerdream.org> <CAN3mi_2u%2BHwFf3m%2BxvsNncfNpj_rFp94xjAv%2Bf0eFT7c4a%2B8Tg@mail.gmail.com> <4EDA489B.9060503@midsummerdream.org> <4EDA56A3.6090108@cyberleo.net> <4edb4b48.LvOhZvvsP1inJeps%perryh@pluto.rain.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Can glabels, gpt, and zfs all work together? I have a system where I have disks with 4 gpt partitions. Partitions 2 and 3 are part of gmirror arrays, and partition 4 is part of a zfs pool. glabel says it writes to the end of the partition, which I believe zfs also writes to doesn't it? Rob On 12/4/11 4:28 AM, perryh@pluto.rain.com wrote: > CyberLeo Kitsana<cyberleo@cyberleo.net> wrote: > >> You cannot combine GPT with glabel (or any other geom class >> that writes data to the first or last 34 sectors of a disk, >> like gmirror) due to layout conflicts. > > This is overstated. Since a GPT ordinarily is intended to be booted > from, and so must be recognized by the BIOS, it must be written > directly on the actual drive -- the "rank 1 provider" in GEOM terms > -- because that is the only way for the GPT metadata to be located > where the BIOS expects to find it (at both the beginning and the end > of the drive). > > It is, however, possible to combine GPT with gmirror, gjournal, > etc. by using GPT partitions, rather than drives, as providers > for the other geoms. For example, create a mirror from ad0p1 > and ad2p1 rather than from ad0 and ad2. Similarly, it "should" > be possible to glabel a GPT partition -- although this seems > unlikely to be useful in practice since GPT provides its own > labelling scheme. > >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4EE91308.8050300>