红帽全球峰会3.10. 在 LVM-VDO 卷中更改去重设置
默认启用了 VDO 池逻辑卷(LV)的去重。要保存内存，您可以禁用去重。使用 lvchange 命令启用或禁用去重。
注意
由于 VDO 处理正在进行的并行 I/O 操作的方式，VDO 卷将继续识别这些操作中的重复数据。例如，如果虚拟机克隆操作正在进行中，且 VDO 卷有很多紧密相邻的重复块，则卷仍可使用去重来节省一些空间。卷的索引状态不会影响进程。
先决条件
- 您的系统中有 LVM-VDO 卷。
流程
检查逻辑卷的去重状态：
lvs -o+vdo_deduplication,vdo_index_state
# lvs -o+vdo_deduplication,vdo_index_state LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert VDODeduplication VDOIndexState vdo_name vg_name vwi-a-v--- 1.00t vpool0 0.00 enabled online vpool0 vg_name dwi------- <15.00g 20.03 enabled onlineCopy to Clipboard Copied! Toggle word wrap Toggle overflow 禁用 VDOPoolLV 的去重：
lvchange --deduplication n vg-name/vdopoolname
# lvchange --deduplication n vg-name/vdopoolnameCopy to Clipboard Copied! Toggle word wrap Toggle overflow 如果要启用去重，请使用
y选项而不是n。
验证
查看当前的去重状态：
lvs -o+vdo_deduplication,vdo_index_state
# lvs -o+vdo_deduplication,vdo_index_state LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert VDODeduplication VDOIndexState vdo_name vg_name vwi-a-v--- 1.00t vpool0 0.00 closed vpool0 vg_name dwi------- <15.00g 20.03 closedCopy to Clipboard Copied! Toggle word wrap Toggle overflow
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