Hi,
the default rbd chunk size is 4MB, it's the "order" that defines the
chunk size:
rbd info pool/volume1
rbd image 'volume1':
size 8 GiB in 2048 objects
order 22 (4 MiB objects)
You can create images with a different order using the '--object-size'
parameter:
rbd create temp/rbd-16K --object-size 16K --size 100M
rbd info temp/rbd-16K
rbd image 'rbd-16K':
size 100 MiB in 6400 objects
order 14 (16 KiB objects)
There also '--stripe-unit' and '--stripe-count' parameters to keep in
mind, but I'd start simple as possible.
Just a few months back we had to migrate a customer galera cluster
(OpenStack) into CephFS (on SSD pool) because the response times were
awful from the local (rotating) disks of the control nodes. I also
thought about attaching a RBD from a SSD pool, but since the nodes
were already connected to CephFS, we decided to stay with CephFS.
Zitat von filip Mutterer <filip@xxxxxxx>:
Hi!
Is Block alignment for Databases a thing with RBD?
I heard something with 16K alignment ...
If yes how can be checked what alignment a RBD got.
And yes I need to run my Database in Ceph as I have no other storage
with redundandency.
Hints for optimizing a single Block device for a Database are very welcome.
Greetings
filip
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