Thanks guys! This does leave me a little worried that I only have one mon at the moment based on reasons in my previous emails in the list (physical limit of two nodes at the moment). Going to have to get more creative!
Sent from my iPhone
> On Jan 16, 2019, at 02:56, Wido den Hollander <wido@xxxxxxxx> wrote:
>
>
>
>> On 1/16/19 10:36 AM, Matthew Vernon wrote:
>> Hi,
>>
>>> On 16/01/2019 09:02, Brian Topping wrote:
>>>
>>> I’m looking at writes to a fragile SSD on a mon node,
>>> /var/lib/ceph/mon/ceph-{node}/store.db is the big offender at the
>>> moment.
>>> Is it required to be on a physical disk or can it be in tempfs? One
>>> of the log files has paxos strings, so I’m guessing it has to be on
>>> disk for a panic recovery? Are there other options?
>> Yeah, the mon store is worth keeping ;-) It can get quite large with a
>> large cluster and/or big rebalances. We bought some extra storage for
>> our mons and put the mon store onto dedicated storage.
>
> Yes, this can't be stressed enough. Keep in mind: If you loose the MON
> stores you will effectively loose your cluster and thus data!
>
> With some tooling you might be able to rebuild your MON store, but
> that's a task you don't want to take.
>
> Use a DC-grade SSD for your MON stores with enough space (~100GB) and
> you'll be fine.
>
> Wido
>
>>
>> Regards,
>>
>> Matthew
>>
>>
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