Re: Crush and Monitor questions

[Bryant Ng <bryantng@gmail.com>]

Sorry, I misread the Hardware Configuration section of the Ceph 
documentation.  I thought one of the Dell's was a configuration for the 
monitors but both of the Dell R510 and R515 are OSD configuration.

I had another question on the monitors though.  What kind of load 
(requests/second) can a monitor node handle?  My understanding is that 
it just returns the cluster map to the client requesting it?  The 
documentation mentions 3 to 5 monitors in a ceph cluster but what is the 
request rate expected on each of these monitors?

thanks.
Bryant


Bryant Ng wrote:
> Hi,
>
> I'm pretty new to Ceph and am just learning about it.
>
> Where are the CRUSH maps stored in Ceph? In the documentation I see you
> use the 'crushtool' to compile and decompile the crush map.  I
> understand that if a single monitor comes online, it can talk to the
> other existing monitors to get the cluster map but how does it work on
> initial startup?  Or if the entire Ceph clusters goes down b/c of power
> failure or something.
>
> What is the recommended hardware configuration for monitors?  In the
> Hardware Recommendation page it says "A monitor requires approximately
> 10GB of storage space per daemon instance."  per daemon instance is
> talking about the monitor daemon, not the osd daemons?
>
> Also further down on that page, it list some hardware examples where it
> mentions a ligher configuration for monitors.  I am assuming that is the
> Dell PE R510 which contains 8 x 2 TB drives.  Why does the monitor need
> so much space if it's "10GB of storage space per daemon instance".
>
> -Bryant
>
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