Centos 7.5 block_dev support and Command 0x85

[Jazz9]

Hello,

I have been testing ceph with ISCSI and have two remaining warning left. I don't think they are affecting the vmware 6.0 u3 datastore. Performance on a ceph all SSD backend ( 32 SSD ) inside a VM is 11K iops 32QD,10threads,4Kb

2018-07-09 16:35:10.567 900 [WARN] tcmu_unblock_device:418 rbd/AUBUN-VMW-CLUSTER01-SSD.AUBUN-VMW-Cluster01: Kernel does not support the block_dev action.

and

2018-07-09 16:43:52.948 900 [WARN] tcmur_cmdproc_thread:635 rbd/AUBUN-VMW-CLUSTER01-SSD.AUBUN-VMW-Cluster01: Command 0x85 not supported

Are these anything to be worried about?

[mykaul]

I assume the latter is used to get smartd, which may not be supported. Don't think it's an issue.

[dillaman]

Neither are cause for concern -- a future RHEL kernel will include the support for blocking the device and 0x85 is a request for SMART data.