Re: [MooseFS-Users] BTRFS

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

Hi Aleksander.
Can you share what the bad experience with btrfs was?
As to your extra questions:
1.  13TB (95% full) per chunkserver, 17 million files (most are due to the zimbra mail server and samba file servers)2.  Each chunkserver uses a bonded pair of 1Gbps Ethernet3.  1.6.26 -- will move to 2.x soon as the new servers arrived just yesterday

--- mike t.

Re: [MooseFS-Users] BTRFSFrom: Aleksander Wieliczko <aleksander.wieliczko@mo...> - 2015-07-15 13:16:04Attachments: Message as HTML    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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