[ale] Decisions, decisions!!!

[Greg Freemyer]

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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> Ale at ale.org
> http://www.ale.org/mailman/listinfo/ale
>


-- 
Greg Freemyer
Litigation Triage Solutions Specialist
http://www.linkedin.com/in/gregfreemyer

The Norcross Group
The Intersection of Evidence & Technology
http://www.norcrossgroup.com