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在linux下用SSD盘来加速HDD硬盘
source link: https://bajie.dev/posts/20240123-ssd_cache/
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在linux下用SSD盘来加速HDD硬盘
2024-01-23
1 分钟阅读
如上图，数据写到硬盘有两种方式，一种是Bcache用SSD做缓冲，加速最后的硬盘读写。另一种是直接读写硬盘，bypass模式。我们用的是第一种Bcache。
$ yum install bcache-tools
/dev/sda是硬盘，/dev/sdb是ssd， 首先把两个盘的数据都擦干净了
$ wipefs -a /dev/sda1 ; wipefs -a /dev/sdb1
格式化hdd和ssd，注意参数不同
$ make-bcache -B /dev/sda1 ; make-bcache -C /dev/sdb1
挂接bcache0
$ echo C_Set_UUID_VALUE > /sys/block/bcache0/bcache/attach
$ mkfs.ext4 /dev/bcache0
$ mount /dev/bcache0 /mnt
修改硬盘写的方法，改成writeback(原来是writethrough)
1.临时生效的方法（重启失效）
$ echo writeback > /sys/block/bcache0/bcache/cache_mode
2.永久生效的方法
$ echo /dev/sda1 > /sys/fs/bcache/register
最后查看一下状态：
$ bcache-status -s
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