bcache

https://docs.kernel.org/admin-guide/bcache.html

先使用起来

https://wiki.archlinux.org/title/Bcache

echo 1 | sudo tee /sys/block/sda/bcache/stop # 重新转回来 echo 1 | sudo tee /sys/block/sdb/bcache/stop # 重新转回来 sudo wipefs -a /dev/sda sudo wipefs -a /dev/sdb

sudo make-bcache –block 4k -B /dev/sdb –wipe-bcache sudo make-bcache -C /dev/sda –wipe-bcache

sudo bcache-super-show /dev/sda

grep cset.uuid

echo 87e5a730-11be-41d8-a2a7-29f7df10f97b | sudo tee /sys/block/bcache0/bcache/attach sudo mkfs.xfs /dev/bcache0

修改默认的模式: echo writeback | sudo tee /sys/block/bcache0/bcache/cache_mode

/sys/block/sda/bcache/stop 只是 bcache 的状态 cache 似乎是存在自己的 stop 的方法的。

[259908.001200] bcache: bcache_device_free() bcache0 stopped
[259950.530302] bcache: register_bdev() registered backing device sdb
[260030.869901] bcache: __cached_dev_store() Can't attach 66384716-2bc3-404b-bbee-a8211a713380
                : cache set not found
[260042.477131] bcache: __cached_dev_store() Can't attach 66384716-2bc3-404b-bbee-a8211a713380
                : cache set not found
[260072.234224] bcache: __cached_dev_store() Can't attach 66384716-2bc3-404b-bbee-a8211a713380
                : cache set not found
[260105.878972] bcache: __cached_dev_store() Can't attach 66384716-2bc3-404b-bbee-a8211a713380
                : cache set not found
[260133.290381] bcache: __cached_dev_store() Can't attach 66384716-2bc3-404b-bbee-a8211a713380
                : cache set not found
[260168.929476] bcache: __cached_dev_store() Can't attach 66384716-2bc3-404b-bbee-a8211a713380
                : cache set not found
[260178.013369] bcache: __cached_dev_store() Can't attach 66384716-2bc3-404b-bbee-a8211a713380
                : cache set not found

sudo make-bcache –block 4k –bucket 2M -C /dev/sda

[260640.597322] bcache: bch_cached_dev_attach() Couldn't attach sdb: block size less than set's block size
[260656.040193] bcache: bch_cached_dev_attach() Couldn't attach sdb: block size less than set's block size
[260665.535687] bcache: bch_cached_dev_attach() Couldn't attach sdb: block size less than set's block size

基本流程

关闭 bcache 并不容易哇

https://unix.stackexchange.com/questions/225017/how-to-remove-bcache0-volume

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