====== [draft]PVE 上建立 bcache 方式 ======
  * PVE 版本 : 6.3-3
  * 使用 /dev/mmcblk1 當 cache 碟來加速 /dev/sdc

===== 安裝 bcache tools 與清除 /dev/mmcblk1 與 /dev/sdc =====
  * <cli>
apt-get install bcache-tools
wipefs /dev/mmcblk1
wipefs -a /dev/mmcblk1
wipefs /dev/sdc
wipefs -a /dev/sdc
</cli>

===== 建立 bcache 與確認建立完成 =====
  * <cli>
make-bcache -B /dev/sdc -C /dev/mmcblk1
bcache-super-show /dev/mmcblk1
</cli>
  * 應該要出現類似以下訊息:<cli>
root@aac:~# bcache-super-show /dev/mmcblk1
sb.magic                ok
sb.first_sector         8 [match]
sb.csum                 ADD0A846D489C6D0 [match]
sb.version              0 [cache device]

dev.label               (empty)
dev.uuid                f33fe947-d4bc-43b3-9fe2-c6b45b791f0b
dev.sectors_per_block   1
dev.sectors_per_bucket  1024
dev.cache.first_sector  1024
dev.cache.cache_sectors 122141696
dev.cache.total_sectors 122142720
dev.cache.ordered       no
dev.cache.discard       no
dev.cache.pos           0
dev.cache.replacement   0 [lru]

cset.uuid               4db271ee-b057-4ae7-a727-a7f90dc700d7
</cli>
  * 將 cset.uuid 設定到 /sys/block/bcache0/bcache/attach <cli>
echo "4db271ee-b057-4ae7-a727-a7f90dc700d7" > /sys/block/bcache0/bcache/attach
</cli> 


===== 參考網址 =====
  * https://k2r2bai.com/2016/07/05/linux/ubuntu/bcache/

{{tag>pve bcache storage draft}}