Rudi Ahlers wrote:
Madison Kelly wrote:
Morning all,
I've been mulling over how to move to an n-node cluster... I've got
my two-node cluster working nicely, so this isn't critical. I just
want to learn. :)
I've not found any good docs on how to do n-node, so I've been
trying to think of it myself (scary!). One limitation I saw was the
backup serial link for HB. I was thinking that I would need n-1 serial
ports per server to let all nodes talk to all other nodes, but this
seemed problematic as I use 1U servers and I'd need to waste a
(precious) expansion bay for a multi-port serial card (if this was
even possible!).
So I was wondering, is it possible to use USB for HB? I think I saw
it mentioned that it was possible, but have seen no docs for this. If
it is, how possible/reliable would it be to have a USB hub for n-nodes
so that I'd only need one USB cable going into each server?
Secondly,
As I understand it, DRBD only supports two nodes. I know OCFS2
supports n-nodes as an FS, but no help if the underlying block device
doesn't. How do people get around this limitation? I am hoping to
avoid the need for fancy hardware, as we are a very small company.
Would OCFS2 formatted NAS device work?
Thanks for any pointers!
Madison
This sounds like a great idea.
I have one important question though, what type of USB cable does one
use for this type of operation? And how do you overcome the problem if 2
of the 4 node cluster is in another room (say on the second floor of the
building), or something like that?
For the USB, I would *suspect* you would use a data transfer style cable
(cross over equiv.?)... But I am not sure, hence my question this
morning. :)
As for long throw, I haven't even begun thinking of this as I am still
working on the basics. For serial, I would probably use those DB9-RJ45
adapters and run a long CAT5(e) cable. Not sure if there is something
equivalent for USB. In my case, I would have the nodes in the same rack
for now. It's certainly an interesting question, and one I plan to look
at down the road as I learn more.
Madi
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