Hi,
I'm new to ceph and trying to find if on CentOS there is a way to issue
IOCTL or similar custom requests (other than fops request like OS issued
read/write requests) from ceph OSD/RBD to the underlying SCSI LLD.
>From initial reading of docs it looks like in the I/O stack user/client
issued I/Os would reach the actual device as below:
Client I/O req
VFS
ceph fs
Ceph OSD daemon
RBD
SCSI midlayer
SCSI LLD (say mpt3sas)
Disk
Ref:
https://en.wikipedia.org/wiki/NVM_Express#/media/File:IO_stack_of_the_Li
nux_kernel.svg
My question is:
The SCSI LLD would support both read /write entry points for I/O
requests issued by the filesystem/block I/O but they also support some
custom requests using IOCTLs. So how can ceph support issuing of such
IOCTL requests to the device if user issues such request. Say for
example power cycling the drive etc. It can also be a passthro request
down to the device.
Appreciate the help and thanks in advance.
thanks & regards,
naveen
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