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<div class="moz-cite-prefix">100 servers has your running 400GB of
ram and 2TB of storage per server or 4TB of storage overall.<br>
<br>
That would actually be within the range of 2 systems using DBRB
and SSDs and you would get extremely fast performance.<br>
<br>
I would argue that CEPH works best for large data sets and where
there are LOTS of disks.<br>
A 2 MON/OSD solution will work and is a place to start building a
larger system but not as the final target of the system.<br>
<br>
That however is just my observations.<br>
<br>
On 04/04/2014 02:17 AM, Ian Marshall wrote:<br>
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<p><font size="2">Hi<br>
<br>
I am implementing a small Openstack production system across
two sites. This will initially have 2 controller nodes (also
acting as network nodes) and 2 compute nodes at each site.
Network up to hadware load balancers will be 10gbe.<br>
<br>
Expectation is we will be running about 80-100 VMs at each
site (4gb Ram and 20gb volumes). These will boot and run
from block storage. About 90% of these will run Tomcat
servers, the others Apache. They will be stateless.<br>
<br>
I have been told Ceph solution will not provide the
necessary performance compared to SAN (EquaLogic) unless
using SSD drives for journals which is out of budget at
present. If I was confident to go with Ceph - I would be
planning 2 storage servers with 10k sas drives and write
back cache on raid controllers and have each drive as Raid0
with a partition for journals.<br>
<br>
Could anyone provide evidence of using Ceph for this size
production, as my preference is a ceph based stirage
solution to privide flexibility in storage - especially as
long term plan is to replicate across WAN.<br>
<br>
Pros and cons between a SAN and Ceph would also be
appreciated. <br>
<br>
Regards<br>
Ian<br>
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<pre class="moz-signature" cols="72">--
Alvin Starr || voice: (905)513-7688
Netvel Inc. || Cell: (416)806-0133
<a class="moz-txt-link-abbreviated" href="mailto:alvin@netvel.net">alvin@netvel.net</a> ||
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