Re: [Moosefs-users] chunkserver priority?

[Giovanni T. <gt...@li...>]

Il 01/03/2011 14:21, Michal Borychowski ha scritto:
> This is quite an interesting suggestion of computers usage but not that easy
> to implement. We could think of "auxiliary chunkserver" but we should how to
> interpret goal value. Does goal=2 mean that we need to have 2 copies on the
> main chunkservers and one extra on the auxiliary one or one at the main and
> one at the auxiliary? How would the master know that auxiliary chunkserver
> would be permanently unavailable? 

The auxiliary chunkserver should be intended as extra copies for
lowering the I/O and network load on main chunkserver.

I have servers and main switches on Gigabit Ethernet and Fibre Channel,
but desktop clients are 10/100 on 10/100 switches, so the bandwidth is
capped to 10/100 in each room (5-6 clients on each room).

The reason I cannot use *now* the local desktop hd as auxiliary
chunckserver it's because I haven't the assurance that if all the
auxiliary chunckserver are down, all chunks are available on the main
chunkservers.

On the other hand, another solution could be to implement client-side
disk caching, like fs-cache, in the same way nfsv4 do (via cachefilesd).

> So for now we put it in the section "nice ideas" and we'll come back to it.

Thank you Michał.

-- 
Giovanni Toraldo
http://www.libersoft.it/