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Zfs

Get status

zfs list

Create mount point

zfs create ${POOL_NAME}/${MOUNT_POINT}

Pool

Get status

zpool status

List disks by id

ls -lsah /dev/disk/by-id/

Replace faulty drive

zpool replace ${POOL_NAME} ${OLD_DISK_ID} ${NEW_DISK_ID}

Add more drive to the pool

Existing single drive pool

zpool attach ${POOL_NAME} ${EXISTING_DISK_ID} ${NEW_DISK_ID}

Existing raid 1

zpool add ${POOL_NAME} [${NEW_DISK_ID}, ...]

Expand pool

First make sure autoexpand is set to on

zpool set autoexpand=on ${POOL_NAME}

Propagate changes to drives. Run the script for every drive of the pool

zpool online -e ${POOL_NAME} ${DRIVE_ID}

Add read cache to pool

zpool add ${POOL_NAME} cache ${DRIVE_ID}

Disable atime for pool (increase speed disabling access log)

zfs set atime=off ${POOL_NAME}

Create cloud init template images

Ubuntu

qm create 5000 --memory 4096 --core 2 --name ubuntu-cloud --net0 virtio,bridge=vmbr0
cd /var/lib/vz/template/iso/
qm importdisk 5000 ${UBUNTU_VERSION}-server-cloudimg-amd64-disk-kvm.img ${STORAGE:-local-zfs}
qm set 5000 --scsihw virtio-scsi-pci --scsi0 ${STORAGE:-local-zfs}:vm-5000-disk-0
qm set 5000 --ide2 ${STORAGE:-local-zfs}:cloudinit
qm set 5000 --boot c --bootdisk scsi0
qm set 5000 --serial0 socket --vga serial0

Then change cpu stuff, disable memory balooning, set cloud init credentials and finally create template