Pools
The Ceph Object Gateway uses several pools for its various storage needs,
which are listed in the Zone object (see radosgw-admin zone get
). A
single zone named default
is created automatically with pool names
starting with default.rgw.
, but a Multisite Configuration will have
multiple zones.
Tuning
When radosgw
first tries to operate on a zone pool that does not exist, it
will create that pool with the default values from osd pool default pg num
and osd pool default pgp num
. These defaults are sufficient for some pools,
but others (especially those listed in placement_pools
for the bucket index
and data) will require additional tuning. See Pools for details
on pool creation.
Pool Namespaces
New in version Luminous.
Pool names particular to a zone follow the naming convention
{zone-name}.pool-name
. For example, a zone named us-east
will
have the following pools:
.rgw.root
us-east.rgw.control
us-east.rgw.meta
us-east.rgw.log
us-east.rgw.buckets.index
us-east.rgw.buckets.data
The zone definitions list several more pools than that, but many of those
are consolidated through the use of rados namespaces. For example, all of
the following pool entries use namespaces of the us-east.rgw.meta
pool:
"user_keys_pool": "us-east.rgw.meta:users.keys",
"user_email_pool": "us-east.rgw.meta:users.email",
"user_swift_pool": "us-east.rgw.meta:users.swift",
"user_uid_pool": "us-east.rgw.meta:users.uid",