I just installed a LVM Cache to a RAID1 and it seems it works...
This is what i did:
lvcreate --name lv_cache kujira -L 20G
lvcreate --name lv_cache_meta kujira -L 1G
lvconvert --type cache-pool --poolmetadata kujira/lv_cache_meta kujira/lv_cache
lvconvert --type cache --cachepool kujira/lv_cache kujira/srv
So far so good. But here are a few traps for youngplayers:
1) The Mirrored Volume will not be shown as mirrored when using
lvs --all instead to see the mirror status as well.
2) Install the suggested Package
/usr/sbin/check_cache can not be found, and the LVM can not be put
into active state.
Speedwise I can not say that it much improoves, but I did not tried much things
beside a short