However, there are significant differences between RAIDZ and RAID5: block size can vary on the same pool from a sector to several kilobytes. RAIDZ1 pool - similar to a RAID5 where a parity function is calculated over the data blocks.Mirror pool - metadata and user data are stored in two copies.Metadata records are duplicated over the pool member disks. Stripe pool - similar to a regular RAID0 in which data blocks are distributed over the member disks.Single disk - no redundancy however, metadata records are still duplicated over different sectors of the disk.There are several types of ZFS pools which mostly differ in redundancy level: The pool is then used to create one or more filesystems (called datasets) or block devices. ZFS volume manager operates with storage devices which are combined in a ZFS pool. ZFS is a copy-on-write filesystem meaning that every metadata modification is done by creating a new copy of metadata records Unlike a typical filesystem, ZFS is a combination of filesystem and logical volume manager allowing to combine different storage devices,īe it a hard drive or a disk image file, into a single storage with various levels of redundancy.īy default, all metadata records are duplicated while user data is stored according to the set redundancy level. ReclaiMe Pro can recover data from QNAP devices TVS-x72XT, TVS-x72X, TVS-hx74, TS-x73A series, TVS-675, and some other working under QuTS hero operating system. While home users create ZFS based home NASes in the TrueNAS environment (formerly known as FreeNAS).Ī couple of years ago some NAS vendors started using ZFS filesystem in the NAS devices, for example QNAP Systems, Inc. Enterprises typically use ZFS on their big storage servers ZFS (Zettabyte File System) is a proprietary filesystem originally designed by SUN Microsystems and then moved

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