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Looked at Autotier before, but the development looked pretty stale (which is not too bad per se if it is stable). Is there any experience/ recommendations with
by riedel 1y ago
Looked at Autotier before, but the development looked pretty stale (which is not too bad per se if it is stable). Is there any experience/ recommendations with putting bcachefs also on top of networked block storage such as CEPH ? As CEPH SSD caching seems pretty deprecated by default, at work we looked at a solution to marry our HDD and SSD pool for users that do want to put too much thoughts into tiering by mount points.
- magicalhippo 1y agoWill be interesting to play with. I used lvm cache to put ZFS on top of local NVMe for write-back caching of iSCSI targets, as ZFS has good built-in read caching. Worked pretty well in the limited tests I did, but it's not magic. Main reason I didn't pursue is that it felt a bit like a house of cards. Though on the positive side, one could always mount the underlying storage, ie partitions serving the iSCSI targets, as a local pool on another machine.
- IcePic 1y agoYou could use bcachefs on the OSD drives, but you can also just point the WAL/DB of the OSD to a partition on the ssd and have the data on hdd. You don't have to tier pools to get help with small writes/metadata using ssds.