Re: rbd pool:replica size choose: 2 vs 3

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Hi

with rep_size=2 and min_size=2, what drawbacks are removed compared with 
rep_size=2 and min_size=1?

thx
J.

On 23/09/16 10:07, Wido den Hollander wrote:
>> Op 23 september 2016 om 10:04 schreef mj <lists@xxxxxxxxxxxxx>:
>>
>>
>> Hi,
>>
>> On 09/23/2016 09:41 AM, Dan van der Ster wrote:
>>>> If you care about your data you run with size = 3 and min_size = 2.
>>>>
>>>> Wido
>> We're currently running with min_size 1. Can we simply change this,
>> online, with:
>>
>> ceph osd pool set vm-storage min_size 2
>>
>> and expect everything to continue running?
>>
> Yes, it will. No rebalance will happen. min_size = 2 just tells Ceph that 2 replicas need to be online for I/O (Read and Write) to continue.
>
> Wido
>
>> (our cluster is HEALTH_OK, enough disk space, etc, etc)
>>
>> MJ
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