Date: Tue, 02 Sep 2003 23:33:55 +0300 From: Petri Helenius <pete@he.iki.fi> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Max Clark <max.clark@media.net> Subject: Re: FW: 20TB Storage System Message-ID: <3F54FEB3.4050005@he.iki.fi> In-Reply-To: <50599.1062532904@critter.freebsd.dk> References: <50599.1062532904@critter.freebsd.dk>
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Poul-Henning Kamp wrote: >>2) What is the maximum size of a filesystem that I can present to the host >>OS using vinum/ccd? Am I limited anywhere that I am not aware of? >> >> > >Good question, I'm not sure we currently know the exact barrier. > Just make sure you run UFS2, which is the default on -CURRENT because UFS1 has a 1TB limit. >>3) Could I put all 20TB on one system, or will I need two to sustain the IO >>required? >> >> > >Spreading it will give you more I/O bandwidth. > > > Can you say why? Usually putting more spindles into one pile gives you more I/O, unless you have very evenly distributed sequential access in pattern you can predict in advance. Pete
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