![]() The middle layer is the Data Management Unit, which uses the storage provided by the SPA by reading and writing to it transactionally in an atomic manner. The bottom layer is the Storage Pool Allocator, which handles organizing the physical disks into storage. ZFS itself is composed of three principle layers. At time of import or creation, the pool stores the system's unique hostid and for the purposes of supporting multipath, import into other systems will fail unless forced. At creation, a pool is imported into the system, such that an entry in the zpool.cache file is created. ![]() This is because a ZFS pool will always have a mountable filesystem called the root dataset, which is mounted at pool creation. The creation of a usable filesystem with redundancy from a set of disks can be accomplished with 1 command and this will be persistent upon reboots. This allows the same tasks to be accomplished with less code, greater reliability and simplified administration. The ZFS pool is a full storage stack capable of replacing RAID, partitioning, volume management, fstab/exports files and traditional file-systems that span only 1 disk, such as UFS and XFS. The basic unit of storage in ZFS is the pool and from it, we obtain datasets that can be either mountpoints (a mountable filesystem) or block devices. ZFS is a rethinking of the traditional storage stack. 5.3 Platform/Distribution documentation. ![]()
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