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by kdkeyser
2785 days ago
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A full blown filesystem is overkill for an object store. You could use something like libzbc ( https://github.com/hgst/libzbc ) to write directly to the SMR drives on the block level. I believe Ceph now has abstracted the drives away through BlueStore, which simply puts a large RocksDB database on the drive, bypassing most of the functionality a filesystem offers. It should be much easier to make an SMR compatible version of the LSM-tree backend of RocksDB, than writing a full-blown file system. |
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RocksDB is one of several possible backends for object maps. There is a lot more to BlueStore than just omaps.
Also, BlueStore was actually designed with SMR drives in mind, however certain components of it are best placed on solid state media.