Configuration of Raid

[Dave Peters]

It is because we have mutli web server.

--DP

--- On Tue, 5/11/10, Richard Pieri <richard.pieri-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:

> From: Richard Pieri <richard.pieri-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org>
> Subject: Re: Configuration of Raid
> To: "Boston Linux and Unix" <discuss-mNDKBlG2WHs at public.gmane.org>
> Date: Tuesday, May 11, 2010, 1:59 PM
> On May 11, 2010, at 1:41 PM, Dave
> Peters wrote:
> > 
> > We have a MD3000i (15 x 450GB 15K rpm) and MD1000 (15
> x 1TB 7.2 RPM) joined together. How many Raid Group and LUN
> should I create for the best performance? 15K RPM disk will
> be used for Database Server and 7.2 RPM disk group will be
> used as Web Server?
> > Any suggestion?
> 
> Maximum spindle distribution = maximum performance
> (usually), so glom the 15x450GB into a single striped set
> (RAID 0) and the 15x1TB into a single striped set (also RAID
> 0).  Your reliability will suck.  Each stripe set
> has 15 points of failure with zero redundancy.
> 
> For redundancy and performance, I would set up 14 disks
> from each set in a RAID 1+0 with 1 hot spare.
> 
> Although... I have to wonder... why do you have 15TB of
> disk for your web server but "only" 7TB for your database?
> 
> --Rich P.
> 
> 
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