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List:       ceph-users
Subject:    [ceph-users] Re: bucket_index_max_shards vs. no resharding in multisite? How to brace RADOS for huge
From:       Christian Rohmann <christian.rohmann () inovex ! de>
Date:       2021-09-30 15:47:39
Message-ID: 4a7f9b8d-af9f-0caf-2cf2-322efc387ad9 () inovex ! de
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On 30/09/2021 17:02, Christian Rohmann wrote:
>
> Looking at my zones I can see that the master zone (converted from 
> previously single-site setup) has
>
>>  bucket_index_max_shards=0
>
> while the other, secondary zone has
>>  bucket_index_max_shards=11
>
> Should I align this and use "11" as the default static number of 
> shards for all new buckets then?
> Maybe an even higher (prime) number just to be save? 


Reading 
https://docs.ceph.com/en/octopus/install/ceph-deploy/install-ceph-gateway/#configure-bucket-sharding 
again,
it seems there are some instructions on editing the zonegroup JSON to 
set bucket_index_max_shards to something sensible.

Unfortunately there is no word about this in the mutisite conversion 
section 
(https://docs.ceph.com/en/octopus/radosgw/multisite/#migrating-a-single-site-system-to-multi-site) 
- maybe this would be sensible to ensure folks converting to a multisite 
setup don't end up with huge unsharded bucket indices which also cannot 
be resharded or even are resharded automatically.


Regards

Christian
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