Re: [MooseFS-Users] MooseFS 4.0 and new features

[Gandalf C. <gan...@gm...>]

This is very interesting
Any official and detailed docs about the HA feature?

Other than this, without making any flame, which are the differences
between MFS4 and LizardFS?

Il dom 20 mag 2018, 11:33 Jakub Kruszona-Zawadzki <ac...@mo...> ha
scritto:

>
> On 19 May 2018, at 18:42, Gandalf Corvotempesta <
> gan...@gm...> wrote:
>
> il sab 19 mag 2018, 17:48 Marco Milano <mar...@gm...> ha scritto:
>
>> Tea Leaves   :-)
>>
>
> Seriously, where did you get this info?
> How HA works in moosefs? Is failover automatic?
>
>>
> MooseFS 4.x now is in “close beta” (or even more “close
> release-candidate”) stage. Currently we started to use it by ourselves.
> When we will see that there are no obvious bugs then we will release it as
> open-source product under GPL-v2 (or even GPL-v2+) licence.
> In the meantime if you want to participate in tests of MFS 4.x - please
> let us know, we will send you packages of MFS 4.x for you OS.
>
> Marco Milano is one of our “testers” and this is why he knows more about
> MFS 4.x
>
> HA in MFS 4.x works fully automatic. You just need to define group of IP
> numbers in your DNS for your “mfsmaster” name. Then install master servers
> and run them on machines with those IP numbers and thats it. One of them
> will became “LEADER” of the group and other “FOLLOWER”-s of the group. If
> for any reason “LEADER” goes down then one of the FOLLOWER’s is chosen as
> an “ELECT” and when more than half of chunkservers connects to it then it
> automatically switches to “LEADER” state and starts working as main master
> server. When your previous leader becomes available again then it usually
> joins the group as a “FOLLOWER”. This is rather “fire and forget” solution.
> They will synchronise metadata between them automatically, chunkservers and
> clients will reconnect to current leader also automatically etc.
>
> Regards,
> Jakub Kruszona-Zawadzki
>
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