Best practice for high availability ZFS pool

[Mehmet Erol Sanliturk]

On Mon, May 16, 2016 at 4:00 PM, Miroslav Lachman <000.fbsd at quip.cz> wrote:

> Palle Girgensohn wrote on 05/17/2016 00:36:
>
>>
>> 16 maj 2016 kl. 15:51 skrev Borja Marcos <borjam at sarenet.es>:
>>>
>>>
>>> On 16 May 2016, at 12:08, Palle Girgensohn <girgen at freebsd.org> wrote:
>>>>
>>>> Hi,
>>>>
>>>> We need to set up a ZFS pool with redundance. The main goal is high
>>>> availability - uptime.
>>>>
>>>> I can see a few of paths to follow.
>>>>
>>>> 1. HAST + ZFS
>>>>
>>>
>>> Which means that a possible corruption causing bug in ZFS would vaporize
>>> the data of both replicas.
>>>
>>> 3. ZFS replication (zfs snapshot + zfs send | ssh | zfs receive)
>>>>
>>>
>>> If you don’t have a hard requirement for synchronous replication (and,
>>> in that case, I would opt for a more application
>>> aware approach) it’s the best method in my opinion.
>>>
>>
>> That was exactly my thought 18 months ago, and we set up two systems with
>> zfs snapshot + zfs send | ssh | zfs receive. It works, but the problem is
>> it just too slow and a complete sync takes like 10 minutes for all the file
>> systems. We are forced to sync the file systems one at a time to get the
>> kind of control and separation we need. Even if we could speed that up
>> somehow, we are really looking for a more recilient system. Also, constant
>> snapshotting and writing makes scrub very slow so we need to tune down the
>> amount of syncing every fourth week-end to scrub. It's OK but not optimal,
>> so we're pondering for something better.
>>
>> My first choice is really HAST at the moment, but I also dont find much
>> written in the last couple of years, apart from some articles about setting
>> it up in very minimal testbeds or posts about performance and stability
>> troubles. This makes me wonder, is HAST actively maintained? Is it stable,
>> used and loved by the community? I'd love to hear some success stories with
>> farily large installations of at least 20 TB or so.
>>
>
> I am not using HAST personally but I read about success with HAST and ZFS
> somewhere in FreeBSD mailing lists. I don't have a direct link / bookmark
> for it. Maybe you will find it thru search engine.
>
> Miroslav Lachman
> _______________________________________________
> f <freebsd-fs at freebsd.org>
>


If you search

HAST and ZFS

in Google , it will provide a long list of possible related pages .



Mehmet Erol Sanliturk