Ubuntu – Poor XFS performance — what’s going on

assuming zabbix and gnu tools... add to zabbix agent daemon config file the following :

UserParameter=zpool.status,zpool status | grep -q "No known data errors" && echo 1 || echo 0

now, in zabbix add an item with key "zpool.status", create a trigger against it (using a function like ".last(0)=0") and you're done - trigger will fire whenever that string is missing from the zpool status output.

this also assumes that 'zpool' will be in the path of the zabbix user, and that this user will be allowed to run zpool. if not, specify full path and use sudo. another catch might be a default shell that doesn't support used syntax, in which case you can either rewrite the userparameter, or force it to use bash.

I would probably use something like the shared folder feature rather than any type of virtual drive (RAW or normal). The reason being is that it has the potential to complicate the snapshot process if you have multiple [virtual] drives attached to the machine you are taking the snapshots of. I would suggest testing the performance to make sure it is adequate, though the hoops it goes through will all be on the same machine and shouldn't be that bad.

How are the four drives organized now? Do you have them in one big dm/hw raid volume or just mounted as separate points?