Statistics for RBD objects

[Valentin Atanassov]

Hi ,

Statistics for rbd's are not working:

All other graphs and statics are OK. What could be the reason?

[Lenz Grimmer]

Hi Valentin,

On 11/23/2017 11:15 PM, Valentin Atanassov wrote:

> Statistics for rbd's are not working:
>

> All other graphs and statics are OK. What could be the reason?

These RBD images probably lack the "fast-diff" feature flag, which makes
performing the disk usage calculation a very costly and time-consuming
operation. We skip the calculation for these images, to reduce the load
on the Ceph cluster.

Unfortunately enabling "fast-diff" makes these RBDs incompatible with
the kRBD kernel client :/

Lenz
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[Valentin Atanassov]

Thanks Lenz. It is OK, I do not use kRBD. and have plenty of CPU and the memory resources  in the nodes. Is there way to re-enable them ?  On another note haw I can remove or add OSD's via openATTIC interface  if it is possible at  all?

[Valentin Atanassov]

[Lenz Grimmer]

(reposting to the mailing list, for everyone's benefit)

On 11/24/2017 12:20 PM, Valentin Atanassov wrote:

> Thanks Lenz. It is OK, I do not use kRBD. and have plenty of CPU and
> the memory resources in the nodes. Is there way to re-enable them ?

Not via oA yet, but we're currently working on adding RBD editing
functionality: https://tracker.openattic.org/browse/OP-2764

You can change these features manually using the "rbd" CLI.

> On another note haw I can remove or add OSD's via openATTIC interface
> if it is possible at all?

That too is a feature on our TODO list. Currently, all node management
and maintenance needs to be performed via DeepSea. But basic OSD
management functionality is top on the list, as it's the most frequent
task in a running cluster.

[Valentin Atanassov]

When I mentioned that I am not using kRBD client, I mean that I am using nbd (network block device). Simply using rbd-nbd to mount rbd images and present them to iSCSI target. We can use LIO or SCST. I am using SCST iSCSI target. All this is done in order to test new features of RBD exclusive lock, object map etc. Most of them are still not supported even from the latest kernel 4.14.2 except exclusive lock, but for statistics we need exclusive lock object map and fast diff. In fact all new features   for RBD are working via rbd-nbd device map see image: