Date: Thu, 26 Mar 2015 16:29:07 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Alan Somers <asomers@freebsd.org> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Wojciech Puchar <wojtek@puchar.net> Subject: Re: Seagate Archive HDD Message-ID: <CAJ-Vmo=AR8Rb4qj8iy2WVo4aNCfyMCAL4LG%2BjFa5CiTTGeB-vQ@mail.gmail.com> In-Reply-To: <CAOtMX2hwYo=K2sZ3iXizGxET7_tvvhxn55jC102Wmg%2BC=Nq6cg@mail.gmail.com> References: <alpine.BSF.2.20.1503261124380.1417@laptop.wojtek.intra> <CAJ-Vmo=8KAS9oAeR1LW0yfbdoMeiti1m%2BNNzSYeZavGDS8NVnw@mail.gmail.com> <CAOtMX2hwYo=K2sZ3iXizGxET7_tvvhxn55jC102Wmg%2BC=Nq6cg@mail.gmail.com>
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On 26 March 2015 at 15:37, Alan Somers <asomers@freebsd.org> wrote: > On Thu, Mar 26, 2015 at 4:33 PM, Adrian Chadd <adrian@freebsd.org> wrote: >> Hm, what's required to get the stripe size for doing IO or whatever >> the under-the-hood thing is for the Sharding? >> >> -a > > My understanding is that it's impossible; the drive-managed SMR drives > present themselves as ordinary disks. But, if their design is similar > to the upcoming host-aware SMR drives, then the band size will be on > the order of a few hundred megabytes. Does anyone have anything that we can expose to userland / GEOM? There's a bunch of useful userland storage stuff that would benefit from knowing this kind of thing. -adrian
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