[PVE-User] Ceph unterstanding questions

Mehmet proxmox at elchaka.de
Sun Mar 19 16:49:55 CET 2017


Hi Daniel, i would Not use Size of 2! At least you should use Size 3 and min Size of 2.

Otherwise you will be in Trouble in Case of a serious ceph error.

You can find a lot of discussion in the ceph Mailing List Related to this.

Hf
- Mehmet 

Am 19. März 2017 01:24:33 MEZ schrieb Alwin Antreich <sysadmin-pve at cognitec.com>:
>Hi Daniel,
>
>On 03/18/2017 11:17 PM, Daniel wrote:
>> Hi there,
>>
>> i created a Cephcluster with 6 OSDs. Each OSD has 500GB
>>
>> In Proxmox I created a Pool with Size 2 Min 1.
>> Ceph df shows me I can use round about 1300GB Disk space.
>> Now I wanted to understand what Size and Min means.
>>
>> I think Size means duplicate 2 times – that’s the reason why I can
>use only the half of 2700GB which also means I can break 3 HDDs.
>> But what means Min? I also can’t find anything in the documentation.
>The min 1, is the min_size option of the pool and tells ceph what
>should be the minimal number of replicas to serve I/O.
>http://docs.ceph.com/docs/jewel/rados/operations/pools/
>
>ceph mailing list
>http://docs.ceph.com/docs/master/start/get-involved/
>>
>> --
>> Grüsse
>>
>> Daniel
>> _______________________________________________
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>>
>Cheers,
>Alwin
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