This ruleset works well for replicated pools with size 6 (I have tested it on
data and metadata pools, which I cannot delete).
The erasure pool with k=3 and m=3 must have size 6?
Pavel.
> On 19/06/2014 18:17, Pavel V. Kaygorodov wrote:
>> Hi!
>>
>> I want to make erasure-coded pool with k=3 and m=3. Also, I want to
>> distribute data between two hosts, having 3 osd from host1 and 3 from host2.
>> I have created a ruleset:
>>
>> rule ruleset_3_3 {
>> ruleset 0
>> type replicated
>> min_size 6
>> max_size 6
>> step take host1
>> step chooseleaf firstn 3 type osd
>> step emit
>> step take host2
>> step chooseleaf firstn 3 type osd
>> step emit
>> }
>
> Hi,
>
> I suggest you test the ruleset created with crushtool to check if what comes
> out of it is what you expect. It's quite convenient to use multiple of 10 to
> visually match the result. For instance
>
> crushtool -o /tmp/t.map --num_osds 500 --build node straw 10 datacenter
> straw 10 root straw 0
>
> then you can
>
> crushtool -c /tmp/t.txt -o /tmp/t.map ; crushtool -i /tmp/t.map
> --show-bad-mappings --show-statistics --test --rule 1 --x 1 --num-rep 12
>
> This is the general idea and you can find details about this in the crushtool
> help and the test scripts at
>
> https://github.com/ceph/ceph/tree/master/src/test/cli/crushtool
>
> for instance
>
>
> https://github.com/ceph/ceph/blob/master/src/test/cli/crushtool/bad-mappings.t
>
> which shows what happens when there is a "bad mapping", i.e. the crushmap
> could not be used to get the number of OSD you want. This is most probably
> why pg get stuck.
>
> Cheers
>
>> I have created an erasure code profile:
>>
>> ceph osd erasure-code-profile set def33 k=3 m=3
>>
>> I have created a pool:
>>
>> ceph osd pool create images 2048 2048 erasure def33 ruleset_3_3
>>
>> Now I see 2048 pgs permanently in "creating" state.
>>
>> What is wrong?
>>
>> Pavel.
>>
>> _______________________________________________
>> ceph-users mailing list
>> [email protected]
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
> --
> Loïc Dachary, Artisan Logiciel Libre
>
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