[ale] Decisions, decisions!!!

[Jack Schneider]

Thanks, Greg
Just what I needed, Clear succinct and to the point.
Since most of the machine time is spent reading... I will go with Raid1...
I don't have huge data storage needs, just big bumps of important stuff for a 
month or two.  
Really appreciate the input... ALEr's are the best...
Jack


On Monday 27 August 2007 08:04, Greg Freemyer wrote:
> Re: Raid
>
> In theory compared to a single disk:
> Raid 0 w/2 disks -
> 2x the performance,
> 2x the capacity,
> half the reliability (if either fails, you lose)
> 2x cost
>
> Raid 1 w/2 disks-
> 2x the read performance, 1x write performance
> high reliability (iff you monitor and replace failed drive)
> 1x capacity
> 2x cost
>
> Raid 5 w/3 disks (non-degraded) -
> 3x read performance - .75x write performance
> (each write requires 4 io's across 3 disks, so it is slower than a
> single disk solution)
> high reliability (iff you monitor and replace failed drive)
> 2x capacity
> 3x cost
>
> FYI: Real world definately varies from above, but the above is what
> good raid implementations should achieve.
>
> So you have to consider:
> read performance
> write performance
> capacity
> reliability
> drive cost
>
> And pick the best level, or jbod (just a bunch of disks, no raid)
>
> Greg
>
> On 8/26/07, Jack Schneider <puck at dp-indexing.com> wrote:
> > Hi, List
> > Just a update on the new work station. Surprise, Surprise!
> > The Box came with Intel EM64T Xeon Quad-core 3.2 ghz.... No extra $ 8-)
> > So some rethinking of the plan is needed... The Debian Etch install went
> > without a hitch, updated and with NVIDIA drivers. Great Advice..
> > Thanks...Scott Castaline of this list..
> > Just need the get used to the gnome default stuff... I don't intend to
> > add much... I have decided to run Virtual Box on it... So that's next...
> > One small decision needed... Raid0 or Raid1 or none of the
> > above....Looking at the system, it reports Sata I/O of 1.6gbs on each
> > disk. ??? Is that OK? Sounds good to me.. . My question is, am I missing
> > an opportunity to get better VB performance if I don't do raid at all????
> > If Raid, which one?? and why?
> > Any thought's will be appreciated.
> >  Have a great day..
> >  Jack
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