Date: Wed, 19 Nov 2014 08:46:07 -0800 From: Freddie Cash <fjwcash@gmail.com> To: Alan Somers <asomers@freebsd.org> Cc: "freebsd-stable@freebsd.org List" <freebsd-stable@freebsd.org> Subject: Re: 10.1 geom "diskid" Message-ID: <CAOjFWZ6YuzFifaFV4y7idZbT6ywU0_g%2BTt3rPOrTtO_ywT-h-Q@mail.gmail.com> In-Reply-To: <CAOtMX2ifYfmL5nUpVo7tCxD=YUykW=_EWUPHsFa6KpjpX9aU8g@mail.gmail.com> References: <FE4F6E61-C332-40A4-A913-281505819FA7@punkt.de> <166BD891-B686-41F9-A741-9C7E7D989CB8@punkt.de> <CAOtMX2ifYfmL5nUpVo7tCxD=YUykW=_EWUPHsFa6KpjpX9aU8g@mail.gmail.com>
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On Wed, Nov 19, 2014 at 8:08 AM, Alan Somers <asomers@freebsd.org> wrote: > On Wed, Nov 19, 2014 at 8:55 AM, Patrick M. Hausen <hausen@punkt.de> > wrote: > > Now it's getting decidedly weird: > > > >> Am 19.11.2014 um 16:40 schrieb Patrick M. Hausen <hausen@punkt.de>: > >> > >> Hi, all, > >> > >> next question, sorry. I just created a fresh 10.1 installation > >> with ZFS. With the last reboot after adding dedicated SSD > >> based l2arc and zil, the underlying devices are referred to > >> by "diskid" instead of the GPT labels I have first been using: > >> > >> NAME STATE READ WRITE CKSUM > >> zroot ONLINE 0 0 0 > >> mirror-0 ONLINE 0 0 0 > >> gpt/disk0 ONLINE 0 0 0 > >> gpt/disk1 ONLINE 0 0 0 > >> logs > >> diskid/DISK-BTTV334403R7200GGNp2 ONLINE 0 0 0 > >> cache > >> diskid/DISK-BTTV334403R7200GGNp1 ONLINE 0 0 0 > >> > >> I can live with that, but I do not understand why the ada2 device > >> changed from gpt/* to diskid/* while the others did not? > >> > >> /dev/gpt entries are not even present for ada2, neither are ada2p? > >> > >> At least the system could try to be consistent ;-) > > > > gnop create -S 4096 /dev/diskid/DISK-BTTV334403R7200GGNp3 > > zpool create ssd /dev/diskid/DISK-BTTV334403R7200GGNp3.nop > > zpool export ssd > > gnop destroy /dev/diskid/DISK-BTTV334403R7200GGNp3.nop > > zpool import ssd > > zpool status > > > Why the gnop acrobatics? =E2=80=8BFuture-proofing the pool. :) It's going to get harder and harder= to buy 512B harddrives, meaning that at some point, the drives will be replaced with 4K drives, and performance will (potentially) tank on the pool=E2=80= =8B. If you build the pool from the get-go with an ashift of 12 (4K sectors), then you won't have any issues in the future. --=20 Freddie Cash fjwcash@gmail.com
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