On 05/07/2013 06:50 AM, Barry O'Rourke wrote:
Hi,
I'm looking to purchase a production cluster of 3 Dell Poweredge R515's
which I intend to run in 3 x replication. I've opted for the following
configuration;
2 x 6 core processors
32Gb RAM
H700 controller (1Gb cache)
2 x SAS OS disks (in RAID1)
2 x 1Gb ethernet (bonded for cluster network)
2 x 1Gb ethernet (bonded for client network)
and either 4 x 2Tb nearline SAS OSDs or 8 x 1Tb nearline SAS OSDs.
Hi Barry,
With so few disks and the inability to do 10GbE, you may want to
consider doing something like 5-6 R410s or R415s and just using the
on-board controller with a couple of SATA disks and 1 SSD for the
journal. That should give you better aggregate performance since in
your case you can't use 10GbE. It will also spread your OSDs across
more hosts for better redundancy and may not cost that much more per GB
since you won't need to use the H700 card if you are using an SSD for
journals. It's not as dense as R515s or R720XDs can be when fully
loaded, but for small clusters with few disks I think it's a good
trade-off to get the added redundancy and avoid expander/controller
complications.
At the moment I'm undecided on the OSDs, although I'm swaying towards
the second option at the moment as it would give me more flexibility and
the option of using some of the disks as journals.
I'm intending to use this cluster to host the images for ~100 virtual
machines, which will run on different hardware most likely be managed by
OpenNebula.
I'd be interested to hear from anyone running a similar configuration
with a similar use case, especially people who have spent some time
benchmarking a similar configuration and still have a copy of the results.
I'd also welcome any comments or critique on the above specification.
Purchases have to be made via Dell and 10Gb ethernet is out of the
question at the moment.
Cheers,
Barry
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