On 08/05/17 04:57, Warren Wang - ISD wrote:
A little extra background here. If Ceph directly supported LVM
devices as OSDs, we probably wouldn’t have to do what we’re doing
now. We don’t know of a way to be able to use LVM cache device as an
OSD without this type of config. This is primarily to support big
data workloads that use object storage as the only backing storage.
So the type of IO that we see is highly irregular, compared to most
object storage workloads.
This is probably a stupid question, but does using your NVMe as ceph
journals (which is what we do) not do the same sort of job as LVM cache
devices?
Regards,
Matthew
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