Re: [Moosefs-users] FAQ entry on how to add a chunk server

[WK <wk...@bn...>]

On 7/19/11 6:51 AM, Vineet Jain wrote:
> Couple of questions:
>
> 1. Is there an entry on how to add a chunkserver to a system. Offline
> or online is fine?


Online works fine.  We take chunkservers offline and online all the time 
as we swap in better equipment for our growing needs.

> 2. If I have 6 drives in a server. Is it better to have one chunk
> server with 6 drives or 6 chunkservers with one drive each or
> somewhere in the middle.



6 chunkservers will give you better performance as you are spreading out 
the reads and writes over those machines. You also have more high 
availability as the loss of a single chunkserver is not as significant 
to the cluster and its also faster to recover from when bring files 
back  up to your goal setting (assuming goals > 1).

However, 6 chunkservers will consume more space and electricity and will 
involve some maintenance.

So its a question of your priorities.  We tend to use at  least $goal+1 
for the minimum number of chunkservers.

One thought, keep your chunkservers somewhat uniform in terms of RAM and 
storage memory for ease of maintenance.  MFS is so flexible its easy to 
just start throwing spare boxes into the mix for extra storage, but if 
you aren't paying attention, you can create a weak chunkserver that 
tends to impact things at a bad time.

-bill





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