Re: [Moosefs-users] Chunks

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

Hi!

If you set goal=1, all chunks belonging to the same file will go to the same
chunk server.


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


-----Original Message-----
From: Heiko Schröter [mailto:sch...@iu...] 
Sent: Thursday, February 24, 2011 10:09 AM
To: moo...@li...
Subject: Re: [Moosefs-users] Chunks

Am Donnerstag 24 Februar 2011, um 09:54:14 schrieb Laurent Wandrebeck:
> On Thu, 24 Feb 2011 09:24:11 +0100
> Heiko Schröter <sch...@iu...> wrote:
> 
> > Hello,
> Hi,
> > 
> > we are currently investigating moosefs as a successor of our 200TB
storage cfs.
> > mfs-1.6.20, 2.6.36-gentoo-r5, x86_64, fuse 2.8.5
> > Everything is working fine.
> > 
> > We have a question about the way mfs handles chunks.
> > Is it possible to keep the chunks on a single chunkserver, instead of
"load balance" them to all chunkservers ?
> Not that I know of. mfs is designed for reliability, and working with
> goal=1 is as bad as raid 0 when it comes to it.

Thks for the reply but that was not my intention to ask.

I try to keep the "pieces" (chunks) of a file on a single chunkserver.
And yes, i'am quite clear about the risks when setting the goal=1. But this
will affect the number of copies of the whole file, as far as i understand
it.
This what we have now with our lustre system anyway ;-)
Our chunkserver (Raids) are generally running a hardware raid6 with 5 to 8TB
per partition.
I wouldn't mind if all the chunks are spread across theses partitions, as
long as they stay on a single chunkserver.

So, would it be possible to gather all chunks of a single file on a single
chunkserver ?

Regards
Heiko

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