Hi Folks, What library or command line utility does Ceph uses to send raw ATA/SCSI/NVMe commands to the physical storage device consumed as an OSD? In other words, a library/CLI that uses SG_IO ioctl to send SAT/SCSI commands to ATA/SCSI devices and NVME_IOCTL_ADMIN_CMD to send NVMe commands? I looked into libstorage but it's seems like a library dealing with logical management. Some of the use cases such a library that can send ATA/SCSI/NVMe commands would be able to handle are: - Changing the power mode of devices (e.g. a policy that an orchestrator sets for every OSD consumed by it to be always set to standby_z) - Changing the write cache setting of devices (e.g. a dashboard toggle switch to set the OSD write cache on/off) - repurpose or erase a physical device using industry standard crypto erase supported by all three commands sets. - extract telemetry or crash dump from device using standard logs available in each command set. - much richer device information page on the dashboard, that includes physical drive capabilities, settings etc. I can think of a number of other use cases where such a library will be needed. If such capability doesn't exist in Ceph today, may I recommend using opensea-api libraries? https://github.com/seagate/opensea-api There are command line utilities built on top of this library, called openSeaChest that do perform the above use cases I described on direct attached devices. https://github.com/Seagate/openSeaChest Thanks, -Muhammad
