[CentOS] cyrus spool on btrfs?

Fri Sep 8 12:48:43 UTC 2017
Matty <matty91 at gmail.com>

I think it depends on who you ask. Facebook and Netflix are using it
extensively in production:

https://www.linux.com/news/learn/intro-to-linux/how-facebook-uses-linux-and-btrfs-interview-chris-mason

Though they have the in-house kernel engineering resources to
troubleshoot problems. When I see quotes like this [1] on the
product's WIKI:

"The parity RAID code has multiple serious data-loss bugs in it. It
should not be used for anything other than testing purposes."

I'm reluctant to store anything of value on it. Have you considered
using ZoL? I've been using it for quite some time and haven't lost
data.

- Ryan
http://prefetch.net

[1] https://btrfs.wiki.kernel.org/index.php/RAID56


On Thu, Sep 7, 2017 at 2:12 PM, Mark Haney <mark.haney at neonova.net> wrote:
> On 09/07/2017 01:57 PM, hw wrote:
>>
>>
>> Hi,
>>
>> is there anything that speaks against putting a cyrus mail spool onto a
>> btrfs subvolume?
>>
> I might be the lone voice on this, but I refuse to use btrfs for anything,
> much less a mail spool. I used it in production on DB and Web servers and
> fought corruption issues and scrubs hanging the system more times than I can
> count.  (This was within the last 24 months.)  I was told by certain mailing
> lists, that btrfs isn't considered production level.  So, I scrapped the
> lot, went to xfs and haven't had a problem since.
>
> I'm not sure why you'd want your mail spool on a filesystem and seems to
> hate being hammered with reads/writes.  Personally, on all my mail spools, I
> use XFS or EXT4.  OUr servers here handle 600million messages a month
> without trouble on those filesystems.
>
> Just my $0.02.
> --
>
> Mark Haney
> Network Engineer at NeoNova
> 919-460-3330 option 1
> mark.haney at neonova.net
> www.neonova.net
>
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