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doc/dev/crimson: document cyanstore and alienstore

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Signed-off-by: Kefu Chai <kchai@redhat.com>
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Kefu Chai 2021-07-25 14:30:02 +08:00
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doc/dev/crimson/crimson.rst
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@ -39,12 +39,30 @@ As you might expect, crimson is not featurewise on par with its predecessor yet.
object store backend
--------------------
At the moment ``crimson-osd`` offers two object store backends:
At the moment, ``crimson-osd`` offers both native and alienized object store
backends. The native object store backends perform IO using seastar reactor.
They are:
- CyanStore: CyanStore is modeled after memstore in classic OSD.
- AlienStore: AlienStore is short for Alienized BlueStore.
.. describe:: cyanstore
Seastore is still under active development.
CyanStore is modeled after memstore in classic OSD.
.. describe:: seastore
Seastore is still under active development.
While the alienized object store backends are backed by a thread pool, which
is a proxy of the alien store adaptor running in SeaStar. The proxy issues
requests to object stores running in alien threads, i.e., worker threads not
managed by the Seastar framework. They are:
.. describe:: memstore
The memory backed object store
.. describe:: bluestore
The object store used by classic OSD by default.
daemonize
---------
@ -121,17 +139,20 @@ using ``vstart.sh``,
for more Seastar specific command line options.
``--memstore``
``--cyanstore``
use the CyanStore as the object store backend.
``--bluestore``
use the AlienStore as the object store backend. This is the default setting,
if not specified otherwise.
use the alienized BlueStore as the object store backend. This is the default
setting, if not specified otherwise.
``--memstore``
use the alienized MemStore as the object store backend.
So, a typical command to start a single-crimson-node cluster is::
$ MGR=1 MON=1 OSD=1 MDS=0 RGW=0 ../src/vstart.sh -n -x \
--without-dashboard --memstore \
--without-dashboard --cyanstore \
--crimson --nodaemon --redirect-output \
--osd-args "--memory 4G"