Re:Reduce bandwidth costs with dm-cache: fast local SSD cach...
by magicalhippo on Saturday September 13, 2025 @07:34AM
(#45231257)
There was some discussion amongst the ZFS devs for such a feature.
As I recall it was to change the current mirrored read strategy to be aware of the speed of the underlying devices, and prefer the faster if it has capacity. Though perhaps a fixed pool property to always read from a given device was discussed, it's been a while so my memory is hazy.
The use-case was similar IIRC, where a customer wanted to combine local SSD with remote block device.
As I recall it was to change the current mirrored read strategy to be aware of the speed of the underlying devices, and prefer the faster if it has capacity. Though perhaps a fixed pool property to always read from a given device was discussed, it's been a while so my memory is hazy.
The use-case was similar IIRC, where a customer wanted to combine local SSD with remote block device.
So, might come to ZFS.