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cache is a component that stores data so future requests for that data can be served faster; the data stored in a cache might be the results of an earlier computation, or the duplicates of data stored elsewhere.

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devices and the entire SSD as a cache device, you can set this up with make-bcache --bdev /dev/mapper/centos-root /dev/mapper/centos-home --cache /dev/sdb See make-bcache --help for more options. You …
answered Apr 20 '16 by Vincent Yu
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You need to tell the kernel to close the bcache device before rerunning make-bcache on the underlying device. To close a backing device: echo 1 > /sys/block/<device>/bcache/stop To close a cache
answered Jun 26 '15 by Vincent Yu