Re: [Moosefs-users] speed up balancing

[Anh K. H. <ky...@vi...>]

On Fri, 4 Mar 2011 10:42:56 -0700
Thomas S Hatch <tha...@gm...> wrote:

> I am currently migrating my moosefs environment into a new setup,
> new OS, new partitioning, changing out disks for larger disks etc.
> 
> So I need to be able to take a chunkserver down, delete the chunks
> on it, and then have it rebalance as quickly as possible back into
> the overall moosefs cluster, what is the fastest way to do this?
> Should I make the chunks for removal before taking them offline?
> Will that speed up the balancing?

I think the safest way is to mark all disks on the chunk as *obsolete*, and increase the values of "CHUNKS_WRITE_REP_LIMIT" and "CHUNKS_READ_REP_LIMIT" in the file "mfsmaster.cfg" (the master and the chunk are required to restart; the number depends on your network and your file system performance.)

My practice: I have two chunk servers and goal 2 for all files. I replaced a chunk by shutting it down. It's unsafe, but it works for me as my files are local :) If number of chunks is greater than your maximum goal, it's safe to shut down the chunk server that you want to replace (IMHO).

Regards,

-- 
Anh Ky Huynh @ UTC+7
Registered Linux User #392115