On 16-Jul-09, at 18:01 , Will Murnane wrote:
The "direct attached" backplane is right out. This means that each
drive has its own individual sata port, meaning you'd need three SAS
wide ports just to connect the drives.
The single-expander version has one LSI SAS expander, which connects
to all the drives and has two "upstream" ports. This means you plug
in one or two servers directly, and they can both see all the disks.
I've only tested this with one-server configurations. It also has one
"downstream" port which you could use to daisy-chain more expanders
(i.e., more 826/846 cases) onto the same server.
That makes things a heck of a lot clearer, thank you very much for
taking the time to explain!
Ever seen/read about anyone use this kind of setup for HA clustering?
I'm getting ideas about Open HA/Solaris Cluster on top of this setup
with two systems connecting, that would rock!
We have a SC846E1 at work; it's the 24-disk, 4u version of the 826e1.
It's working quite nicely as a SATA JBOD enclosure. We'll probably be
buying another in the coming year to have more capacity.
Good to hear. What HBA(s) are you using against it?
Thanks for pointing to relevant documentation.
The manual for the Supermicro cases [1, 2] does a pretty good job IMO
explaining the different options. See page D-14 and on in the 826
manual, or page D-11 and on in the 846 manual.
I'll read though that, thanks for the detailed pointers.
A.
--
Adam Sherman
CTO, Versature Corp.
Tel: +1.877.498.3772 x113
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