On 1/16/19 11:19 AM, Brian Topping wrote:
> 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!
>
My advice: Do something about this right now.
I can't stress it enough: If you loose that single Monitor you will be
in trouble, big trouble.
Wido
> Sent from my iPhone
>
>> On Jan 16, 2019, at 02:56, Wido den Hollander <w...@42on.com> 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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