Hi everyone,

I am currently looking into different storage solutions for the
infrastructure I am working on. The main usage would be slow storage of
images, archives and maybe later logs. Map/Reduce jobs are a bonus and not
a requirement. Since our current infrastructure is running on SDC7 I
naturally thought about Manta. Other alternatives being Riak S2 or Swift.
The fact that Manta is not oriented toward any specific type/size of files
is a good selling point for me.

The current infrastructure is limited to 1 Rack of around 15 CNs in one
Datacenter. We have plans to extend to multiple racks and at least two
other Datacenters. I currently have 4 CNs and 3~4 SNs available.

One of the 4 SNs is the current SDC Headnode which means that I could do
something like:
1) using 2CNs to setup a HA headnode. The 2CNs left being used for Manta
with 2 Metadata shards. This would free one SN and let me with 4SNs for
Manta.
2) keeping my Headnode where it is and using the 4 CNs + 3 SNs for Manta
with a number of shards to define.
3) buying more CNs/SNs.

As explained before I am primarily looking for storage. My main concern is
keeping as much flexibility as possible for future growth/expansion and raw
performance doesn't really matter.

My questions are:
How many shards should I start with ?
How many CNs / SNs would you recommend (cf solution 1, 2, 3 or others) ?
>From there which zone layout would you recommend ?

Manta documentation
<https://github.com/joyent/manta/blob/master/docs/manta-ops.md#planning-a-manta-deployment>
is
pretty detailed but unfortunately more oriented toward infrastructure with
a fixed number of Datacenter, Racks, etc... Manta seems to have the
flexibility and potential to be easily expansion, following an
infrastructure growth, but I missed any example of it in the documentation.



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