Mastering Proxmox - Third Edition

Issue – VM disk images stored on ZFS is extremely slow

If the VM disk images are stored on ZFS storage, which is configured as RAIDZ3, the VMs will suffer a big performance loss. Especially if the ZFS loses a drive and it goes into data rebalancing, the load on the storage will make the VM almost unusable. When using ZFS, the RAID10 will provide the best performance possible from ZFS storage. RAID10 will have paired vdevs where data will be mirrored and then will be stripped among multiple vdevs. One drawback of using RAID10 is it provides half of the disk capacity of the total number of drives. For example, if 20 2 TB drives are used in a RAID10 ZFS configuration, then the usable space will only be 20 TB. For a non-critical node such as ...