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✏️ /usr/share/doc/bcache-tools/README.Debian

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bcache-tools for Debian
=======================

Notes:
* Always back important data up first!
* Don't put /boot onto a bcache device (grub doesn't understand the disk
  format), but it does work fine for the root device if you use a separate
  (uncached) /boot partition.
* A separate /boot may not be necessary on UEFI systems (untested)
* You can use lvm for the backing and the caching devices, but currently the
  initrd will not automatically activate the vg. This is an issue if you plan
  on caching your root device.

A basic setup guide:
--------------------

Create a backing device:
This formats the partition HDD1 and creates /dev/bcache0.

$ make-bcache -B /dev/HDD1

Create a caching device, copy the `Set UUID' for later.

$ make-bcache -C /dev/SSD1

Connect the two; this only needs to be done once:

$ echo "Set UUID" > /sys/block/bcache0/bcache/attach

You probably want write-back caching, otherwise only reads will be sped up.
Note that this means a dead SSD could result in data loss.

$ echo writeback > /sys/block/bcache0/bcache/cache_mode

Find the UUID of the device:

$ ls /dev/disk/by-uuid -l | grep bcache0

Use this UUID in /etc/fstab since the /dev/bcacheX number may change when a
second bcache device is created.

-- David Mohr <david@mcbf.net>  Wed, 26 Mar 2014 00:09:49 -0600

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