If we have three SSDs installed in a system, with a spare partition for the unused space on the SSD (/dev/sda2
, /dev/sdb2
and /dev/sdc2
). Can bcache
be configured to use all three of those partitions to cache a single backing device (such as /dev/md10
which is laid on top of /dev/sd[defghij]1
).
From what I have read elsewhere, it is possible that a particular SSD device can be used by bcache
to cache multiple hard drives or RAID arrays. But nothing explains whether a backing device can be cached by multiple SSDs at the same time.
For instance, you might have three 100GB SSDs instead of a single large 300GB SSD, and you want to use those as caching devices for a single 12TB array.