Date: Mon, 19 Sep 2011 11:49:45 -0700 (PDT) From: Jason Usher <jusher71@yahoo.com> To: Joshua Boyd <boydjd@jbip.net>, Julian Elischer <julian@freebsd.org> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS obn FreeBSD hardware model for 48 or 96 sata3 paths... Message-ID: <1316458185.42258.YahooMailClassic@web121207.mail.ne1.yahoo.com>
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--- On Fri, 9/16/11, Julian Elischer <julian@freebsd.org> wrote: what is it you are trying to achieve? large storage, or high transaction rates? (or both?) I'm biased but I'd put a 160GB zil on a fusion-io card and dedicate 8G of the ram to it's useage. it's remarkable what a 20uSec turnaround time on your metadata can do.. --- I am optimizing for storage space - as much as possible for the budget. So we are going with SATA3 drives (the 3TB ones) and raidz3 (even though it is a write-intensive application). BUT, in the context of those miserly constraints, I'm trying to figure out what mistakes to avoid and what optimizations are worth making... The fusion-io would be great, but another $5k (or more) is not in the budget. I'm glad we can always add a ZIL after the fact, and maybe we will do so with a cheaper (OCZ ?) pcie based SSD...
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