Hello John,
Thanks for that advice. I would like to convert the network to
Infiniband but my budget certainly wouldn't cover 18 Infiniband NICs on
top of the Infiniband switch. I thought I might be able to justify
splashing out on a fancy GigE switch if I could be sure that users would
notice the difference.
I like the idea of setting up a LAG between the existing Dell 5424
switches but I don't have enough spare ports at the moment. However I
will bear that in mind for the future.
-Dan.
On 01/27/2012 01:38 PM, John Lauro wrote:
If you are considering as much as £3500 for a switch, you might want to
consider infiniband qdr instead. We don't currently have it here, but are
considering it. From what I can it has lower latency, can do 40gbps, is
reasonably priced (slightly better than 10gbe, not comaring directly to
gb) . That said, you would also have to budget for cards and cables even
though the switch price by itself is not so bad...
As you have multiple switches (sounds like 5524 or maybe 5424), the first
next to 0 cost change you should do (if not already done) is setup a LAG
between the switches and run 2-4 cables between switches instead of 1.
-----Original Message-----
From: [email protected] [mailto:gluster-users-
[email protected]] On Behalf Of Dan Bretherton
Sent: Friday, January 27, 2012 8:05 AM
To: gluster-users
Subject: [Gluster-users] Switch recommendations
Dear All,
I need to buy a bigger GigE switch for my GlusterFS cluster and I am
trying to decide whether or not a much more expensive one would be
justified. I have limited experience with networking so I don't know if
it would be appropriate to spend £500, £1500 or £3500 for a 48-port
switch. Those rough costs are based on a comparison of 3 Dell
Powerconnect switches: the 5548 (bigger version of what we have now),
the 6248 and the 7048. The servers in the cluster are nothing special -
mostly Supermicro with SATA drives and 1GigE network adapters. I can
only justify spending more than ~£500 if I can be sure that users would
notice the difference. Some of the users' applications do lots of small
reads and writes, and they do run much more slowly if all the servers
are not connected to the same switch, as is the case now while I don't
have a big enough switch. Any advice or comments would be much
appreciated.
Regards
Dan.
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