Naveen <Naveen.Chandrasekaran <at> radisys.com> writes: > > 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. > Hi, Still waiting for a response. Can any of the experts clarify on this? thanks, naveen -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
