Re: [Moosefs-users] Chunks

[Michal B. <mic...@ge...>]

Hi Heiko!

 

You are definitely right! I made a mistake writing all chunks of the file
with goal=1 would reside just on one chunkserver. Each chunk of the file
would go (more or less by random) to different chunkservers. 

 

On the other hand we again focus on the point that using goal=1 is almost
useless. Unless these are some temporary, unimportant files. The expectation
of distributed file system is to keep at least two copies of the file :)

 

Thank you for being conscious :)

 

 

Kind regards

Michał Borychowski 

MooseFS Support Manager

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Gemius S.A.

ul. Wołoska 7, 02-672 Warszawa

Budynek MARS, klatka D

Tel.: +4822 874-41-00

Fax : +4822 874-41-01

 

 

From: Heiko Schröter [mailto:sch...@iu...] 
Sent: Saturday, February 26, 2011 2:28 PM
To: mic...@ge...
Cc: moo...@li...
Subject: Re: [Moosefs-users] Chunks

 

On Fri, 25 Feb 2011 11:21:33 +0100
"Michal Borychowski" < <mailto:mic...@ge...>
mic...@ge...> wrote:
> Hi!
> 
> If you set goal=1, all chunks belonging to the same file will go to the
same
> chunk server.

Supposed to, but it does not work this way.

In our test setup (one master, one client, two chunkservers) the chunks are
beeing spread across the two chunkservers, even with "goal=1".

df on on the chunksrevr clearly shows that the files are spread evenly
across them.

mfsfileinfo shows that the chunks are placed alternatingly on the chunk
servers.

Incrementing "goal" only increases the number of copies.

Screenshots can be supplied on tuesday since our server room is under
reconstruction over the weekend.

Heiko