Re: 3ware vs. MegaRAID

Jesper Krogh wrote:
> Can someone shed "simple" light on an extremely simple question.
> How do you physicallly get 48 drives attached to an LSI that claims to
> only have 2 internal and 2 external ports?
> (the controller claims to support up to 240 drives).

There are these magic boxes that add "SAS expansion", which basically
splits a single port so you can connect more drives to it. An example
from a vendor some of the regulars on this list like is
http://www.aberdeeninc.com/abcatg/kitjbod-1003.htm

You normally can't buy these except as part of an integrated drive
chassis subsystem. If you get one that has an additional pass-through
port, that's how you can stack these into multiple layers and hit really
large numbers of disks.

--
Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg(at)2ndQuadrant(dot)com www.2ndQuadrant.us