Re: [MooseFS-Users] Fwd: CHUNKS_LOOP_MAX_CPS clarification

[Marco M. <mar...@gm...>]

On 05/11/2018 12:16 PM, Gandalf Corvotempesta wrote:
> Il giorno ven 11 mag 2018 alle ore 17:10 Marco Milano <mar...@gm...>
> ha scritto:
>> And why would EC 8+2 be overkill ? I am assuming that you are at least
> using
>> 2 copies now, which means that if you had 1PB of real data, you will need
> 2PB
>> of raw disk space. If you use EC 8+2, you will need only 1.25PB of raw
> disk space
>> saving you 0.75PB of raw disk space and giving you the equivalent of 3
> copies.
>> You pay less, you get more.  :-)
> 
> That's true for huge clusters.
> Our current test cluster is about 12TB and we have 6x2TB disk on each
> server.
> With EC 8+2 I need 10 servers, right ?
> 
> Anyway, EC is for MFS4.0 Pro....
> 

MFS4.x Pro and MFS4.x CE have the same exact code.

MFS4.x Pro has professional support and additional
software components, utilities, etc.
(You have to pay for MFS4.x Pro)

MFS4.x CE has only the community support.
MFS4.x CE does have EC and HA Master servers.

However, as you pointed out, you can't do EC with such a small cluster.
If you have 3 chunkservers, you can install couple of cheap 12TB drives
and set copies=3 and you are done. (12TB SATA drive is down to about $400)

-- Marco