ZFS application

底下是ZFS系統使用硬體上面要注意的地方。吃記憶體，品質最好用ECC，KVM不要VirtIO，以及擴充卡不要有cache影響硬碟I/O。

Hardware
ZFS depends heavily on memory, so you need at least 4GB to start. In practice, use as much you can get for your hardware/budget. To prevent data corruption, the use of high quality ECC RAM is very recommended.
If you use a dedicated cache and/or log disk, you should use a enterprise class SSD (e.g. Intel SSD DC S3700 Series). This can increase the overall performance quite significantly.
If you are experimenting with an installation of Proxmox inside a VM (Nested_Virtualization), don't use Virtio for disks of that VM, since are not supported by ZFS, use IDE or SCSI (it's ok also with Virtio type contorller) instead.
IMPORTANT: Do not use zfs on top of hardware controller which has it's own cache management. Zfs needs to directly communicate with disks, an HBA adapter is the way to go (or something like LSI controller flashed in 'IT' mode).