Re: [MooseFS-Users] BTRFS

[Michael T. <mic...@ho...>]

Is there a performance boost in increasing the chunkservers and goal?  Adding an additional chunkserver would be more expensive than doubling the current storage space; and I still have enough drive bays in each chunkserver for this.  So at the moment, I can only justify spending for an additional server if there is a significant performance improvement.
It is very gratifying to see that upgrading to 2.x would greatly reduce my concern.  So I guess I'll have to stick it out with ext4 until btrfs is tested more -- I had several bad experiences (fs/data corruption) with xfs in the past that made me stay away from it for good.
Thanks for the insights Aleksander and Ricardo.
Best Regards.
Mike Tinsay

Subject: Re: [MooseFS-Users] BTRFS
From: ale...@mo...
Date: Wed, 15 Jul 2015 23:39:33 +0200
CC: moo...@li...
To: mic...@ho...

Hi.
In your situation the best idea is to add another chunk server and change GOAL to 3 as it was mentioned by Ricardo J. Barberis.Replication mechanism in MooseFS 2.0 and 3.0 is redesigned, and it works much more efficient than in old 1.6 version.So for example if you loose one disk(full 1TB) it will replicate in less than 2 hours - 1TB RAID1 rebuild will take much much more time than this.
Another problems:- RAID1 is slower than JBOD in MooseFS- Available space is lower when you are using RAID1 for chunkserver disk than JBOD. 
About BTRFS - we have tested older version of BTFS an we had kernel panic during tests.We didn’t test the latest available release but we will in the nearest future.At this moment we recommend XFS as backend FS for chunkserver disks.
Best regardsAleksander WieliczkoTechnical Support EngineerMooseFS.com <moosefs.com>
On 15 Jul 2015, at 19:17, Ricardo J. Barberis <ric...@do...> wrote: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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