Stupid question, but I admit, I was never been able to measure IOPS and read/write throuhgput. I have a Xen node with 8x SAS 15k disks in hardware RAID-6 (512MB write cache) that I would like to replace with a Proxmox server. My idea is: can I replace this server with a new one by using ZFS 3-way RAID-1 (SAS 7.2 disks) and an SSD as ZIL/L2ARC ? Performance would be much lower ? How many IOPS should I expect with a ZFS 3way mirror VS an HW RAID6 with 8 disks?