Date: Fri, 23 Nov 2012 12:49:42 +1030 From: Shane Ambler <FreeBSD@ShaneWare.Biz> To: Warren Block <wblock@wonkity.com> Cc: freebsd questions list <freebsd-questions@freebsd.org> Subject: Re: FreeBSD on SSD on ASUS P5KPL-C Message-ID: <50AEDD3E.8030007@ShaneWare.Biz> In-Reply-To: <alpine.BSF.2.00.1211212118100.10378@wonkity.com> References: <CAAHVa8thx4_fjQrTUwwGxERtCvTX9NnR59JxH7gQ38tq7irCZw@mail.gmail.com> <CAHHBGkph5j86wDpobasdtM%2BJZMQKt2eqcn8LKd4V0NzyDxR3Tw@mail.gmail.com> <CAAHVa8vm6vFa8ajiOJT3VWnvcZasdQM%2BnaJdjG9eLx%2Bj5F80CA@mail.gmail.com> <50A83993.50401@ShaneWare.Biz> <CAAHVa8uf65aaEWcKehojc0M67Psrn8Mpfj9GT=XR4GK47c%2BBWA@mail.gmail.com> <alpine.BSF.2.00.1211191235400.28618@wonkity.com> <CAAHVa8tZBPGPyuuU0bSwyPdN5ZtW_d4t9cJN7CcxEEaUXO7OGw@mail.gmail.com> <alpine.BSF.2.00.1211191801060.31205@wonkity.com> <CAAHVa8vsXUPn%2BndPsbR3GCdneu5iQSfVt0v--GgDvRvZL8bSCA@mail.gmail.com> <alpine.BSF.2.00.1211212020420.10378@wonkity.com> <alpine.BSF.2.00.1211212118100.10378@wonkity.com>
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On 22/11/2012 14:49, Warren Block wrote: > On Wed, 21 Nov 2012, Warren Block wrote: > >> Got a chance to set up a scratch drive and check this. Turns out >> I left out the step of creating a "slice" (MBR partition) to hold >> the FreeBSD partitions. Also, GPT labels cannot be used in an >> MBR. Fixed below. I will probably add this to my disk setup >> article because it has come up more than once. > > The fdisk/bsdlabel section of my disk setup article has been > rewritten to use gpart. Feedback welcome. > > http://www.wonkity.com/~wblock/docs/html/disksetup.html Something I meant to ask before - is there any benefit to following the steps described in http://www.aisecure.net/2012/01/16/rootzfs/ Abbreviated the steps are - gpart add -t freebsd-zfs -l disk0 ada0 gnop create -S 4096 /dev/gpt/disk0 zpool create zroot /dev/gpt/disk0.nop zpool export zroot gnop destroy /dev/gpt/disk0.nop zpool import zroot The step of using gnop is meant to trick zfs into believing the disk has 4K sector size to improve performance, which I would think zfs would be able to figure out by talking to the disk. Does partitioning hide the sector size or would the step of aligning the partition start to a 4k sector unhide the 4k size? Or are these steps just a waste of time?
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