我为 home_1 LV 设置了 LVM 缓存，我想将其镜像到新的 PV。当我运行 lvconvert 时，出现错误“无法转换 LV myvg/home_1_corig。”
是否可以将缓存和镜像结合起来？如果可以，正确的程序是什么？
# lvs -a -o +devices
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices
[cache_1_cpool] myvg Cwi---C--- 882.81g 1.07 16.19 0.00 cache_1_cpool_cdata(0)
[cache_1_cpool_cdata] myvg Cwi-ao---- 882.81g /dev/nvme1n1p5(12277)
[cache_1_cpool_cmeta] myvg ewi-ao---- 44.00m /dev/nvme1n1p5(238277)
home_1 myvg Cwi-aoC--- <10.92t [cache_1_cpool] [home_1_corig] 1.07 16.19 0.00 home_1_corig(0)
[home_1_corig] myvg owi-aoC--- <10.92t /dev/sde1(0)
[home_1_corig] myvg owi-aoC--- <10.92t /dev/sdd(0)
...
# pvs
PV VG Fmt Attr PSize PFree
/dev/nvme1n1p5 myvg lvm2 a-- 931.02g 172.00m
/dev/sda myvg lvm2 a-- 10.91t 10.91t
/dev/sdc5 myvg lvm2 a-- <931.27g 0
/dev/sdd myvg lvm2 a-- <5.46t 0
/dev/sde1 myvg lvm2 a-- <5.46t 0
# lvconvert -m1 myvg/home_1 /dev/sda
Cannot convert LV myvg/home_1_corig.
更新
经过进一步检查，可以清楚地发现 sda 的大小略小于 sdd + sde1 的大小。减小 home_1 的大小解决了这个问题。
# lvconvert --uncache myvg/home_1
# umount /home
# lvreduce -r -L -8G myvg/home_1
# lvconvert -m1 myvg/home_1 /dev/sda
# lvcreate -n cache_1 -L 882.81g myvg /dev/nvme1n1p5
# lvconvert --type cache --cachemode writethrough --cachepool cache_1 myvg/home_1
# lvs -a -o +devices
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices
[cache_1_cpool] myvg Cwi---C--- 882.81g 0.01 16.19 0.00 cache_1_cpool_cdata(0)
[cache_1_cpool_cdata] myvg Cwi-ao---- 882.81g /dev/nvme1n1p5(12277)
[cache_1_cpool_cmeta] myvg ewi-ao---- 44.00m /dev/nvme1n1p5(238277)
home_1 myvg Cwi-a-C--- <10.91t [cache_1_cpool] [home_1_corig] 0.01 16.19 0.00 home_1_corig(0)
[home_1_corig] myvg rwi-aoC--- <10.91t 2.29 home_1_corig_rimage_0(0),home_1_corig_rimage_1(0)
[home_1_corig_rimage_0] myvg iwi-aor--- <10.91t /dev/sdd1(0)
[home_1_corig_rimage_0] myvg iwi-aor--- <10.91t /dev/sdc(0)
[home_1_corig_rimage_1] myvg Iwi-aor--- <10.91t /dev/sda(1)
[home_1_corig_rmeta_0] myvg ewi-aor--- 4.00m /dev/sdc(1428487)
[home_1_corig_rmeta_1] myvg ewi-aor--- 4.00m /dev/sda(0)