Date: Sun, 28 Dec 2014 19:48:32 +0000 From: "Pokala, Ravi" <rpokala@panasas.com> To: Adrian Chadd <adrian@freebsd.org> Cc: John-Mark Gurney <jmg@funkthat.com>, "freebsd-geom@freebsd.org" <freebsd-geom@freebsd.org> Subject: Re: Converting LBAs to byte offsets through the GEOM stack Message-ID: <D0C5B9CA.1283E9%rpokala@panasas.com> In-Reply-To: <CAJ-Vmomm2yst=NN6hYopY7DR_Nw=HDa2v-Y9xtqji8xZn5b92A@mail.gmail.com> References: <D0B89F30.127DAE%rpokala@panasas.com> <20141219015210.GY25139@funkthat.com> <D0B8C76C.127E55%rpokala@panasas.com> <CAJ-VmokV3-ZRQmVZWcHUSxccwaRxySDExoSiF8%2BsgHtkHN5_yg@mail.gmail.com> <D0BB136C.1280A4%rpokala@panasas.com> <CAJ-Vmomm2yst=NN6hYopY7DR_Nw=HDa2v-Y9xtqji8xZn5b92A@mail.gmail.com>
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Hi Adrian, >So I had a thing that I attached commands to that would funnel down to >the geom layer that did this mirroring/caching/remapping thing, and it >would handle schedule the commands to whatever block(s) on whatever >disk(s) actually represented that particular logical offset. I actually >had something that'd let me issue commands that would map to a single >command to a single disk, or could be replicated to multiple commands to >multiple disks (and then i'd just get the completion from them all in the >reply message, as the bio didn't have enough space to write multiple >block reads into, and mostly I was issuing status check commands like you >are. :) > >Is that making more sense? I can whiteboard it up next time we're in the >same place. That would be very helpful. :-) Next BAFUG? -Ravi
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