Re: [Moosefs-users] Grouping chunk servers

[Michał B. <mic...@ge...>]

Unfortunately not yet. There would some improvements in metaloggers in 1.6.18


Kind regards
Michał Borychowski 

-----Original Message-----
From: Ioannis Aslanidis [mailto:ias...@fl...] 
Sent: Friday, December 03, 2010 6:44 PM
To: moo...@li...
Subject: Re: [Moosefs-users] Grouping chunk servers

Hello,

Any updates on this feature? Do you think it'll be ready soon?

Best regards.

2010/9/15 Alexander Akhobadze <akh...@ri...>:
>
> Hi all!
>
> As far as I understand "Location awareness" is not exactly what Ioannis expects.
> In scenario when whole POP1 goes down and Metadata server was located in POP1
> we have data ambiguity because POP1 may be just disconnected by WAN network failure
> and real Metadata server may be alive. So, in this case in POP2 we can't
> promote Metalogger to Master role.
>
> wbr
> Alexander Akhobadze
>
> ======================================================
> Вы писали 8 сентября 2010 г., 21:44:50:
> ======================================================
>
> According to the roadmap (http://www.moosefs.org/roadmap.html), this is slated for the future:
>
> "Location awareness" of chunkserver - optional file mapping IP_address->location_number.
> As a location we understand a rack in which the chunkserver is located.
> The system would then be able to optimize some operations
> (eg. prefer chunk copy which is located in the same rack).
>
> ----- Original Message -----
> From: "Ioannis Aslanidis" <ias...@fl...>
> To: moo...@li...
> Sent: Wednesday, September 8, 2010 11:37:08 AM
> Subject: [Moosefs-users] Grouping chunk servers
>
> Hello,
>
> I am testing out MooseFS for around 50 to 100 TeraBytes of data.
>
> I have been successful to set up the whole environment. It was pretty
> quick and easy actually. I was able to replicate with goal=3 and it
> worked really nicely.
>
> At this point, there is only one requirement that I was not able to
> accomplish. I require to have 3 copies of a certain chunk, but my
> storage machines are distributed in two points of presence.
>
> I require that each of the points of presence contains at least one
> copy of the chunks. This is fine when you have 3 chunk servers, but it
> won't work if you have 6 chunk servers. The scenario is the following:
>
> POP1: 4 chunk servers (need 2 replicas here)
> POP2: 2 chunk servers (need 1 replica here)
>
> I need this because if the whole POP1 or the whole POP2 go down, I
> need to still be able to access the contents. Writes are normally only
> performed in POP1, so there are normally only reads in POP2.
>
> The situation is worse if I add 2 more chunk servers in POP1 and 1
> more chunk server in POP2.
>
> Is there a way to somehow tell MooseFS that the 4 chunk servers of
> POP1 are in one group and that there should be at least 1 replica in
> this group and that the 2 chunk servers of POP2 are in another group
> and that there should be at least 1 replica in this group?
>
> Is there any way to accomplish this?
>
> Regards.
>
>



-- 
Ioannis Aslanidis
System and Network Administrator
Flumotion Services, S.A.
E-Mail: iaslanidis at flumotion dot com
Office Phone: +34 93 508 63 59
Mobile Phone: +34 672 20 45 75

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