Re: [MooseFS-Users] BTRFS

[Ricardo J. B. <ric...@do...>]

Maybe you could consider another chunkserver and a goal of 3?

It's one more chunkserver but only 1.5x disk space compared to 2x with 2 
chunkservers and RAID1 (whether by software or hardware).

El Miércoles 15/07/2015, Aleksander Wieliczko escribió:
> Hi Michael
>
> We had bad experience with BTFS so we are not advising to use this fs as
> backend for chunkserver HDD.
> We recommend XFS because we achieved the best performance with disk of
> 90% usage.
>
> We have extra questions:
> How big your MooseFS is - how many files you have?
> What is your LAN speed?
> What is the MooseFS version?
>
> Best regards
> Aleksander Wieliczko
> Technical Support Engineer
> MooseFS.com <moosefs.com>
>
> On 15.07.2015 09:24, Michael Tinsay wrote:
> > Hi.
> >
> > Is anybody using btrfs for moosefs?
> >
> > I currently have a 2-chunkserver (using jbod, ext4 fs, and goal=2 for
> > all files) setup running that has recently experienced an hd failure
> > in one of the chunkservers.  While replacing the failed hdd was an
> > almost trivial task, there was a long span of time where a big number
> > of chunks only had 1 copy.  While I did not lose sleep over it, I had
> > this concern of potentially losing chunks should there be another hd
> > failure in the other chunkserver while moosefs is still replicating
> > the 1-copy chunks.
> >
> > So now I'm entertaining the idea of moving from
> > just-a-bunch-of-ext4-disks to one-big-btrfs-raid1-fs as the underlying
> > storage provider -- using Ubuntu 14.04 distro plus the 4.1.x LTS
> > kernel from kernel-ppa.
> >
> > I'm thinking that with such a setup I would still be up and running
> > with 2 copies for all chunks even if both chunkservers have 1 disk
> > failure each at the same time.  And the setup would survive a failed
> > chunkserver with 1 failed disk in the remaining chunkserver.
> >
> > I would like to hear your thoughts on this.
> >
> > Regards.
> >
> >
> > --- mike t.
> >
> >
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-- 
Ricardo J. Barberis
Senior SysAdmin / IT Architect
DonWeb
La Actitud Es Todo
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