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Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. August Learn how and when to remove this template message ZFS compared to other file systems[ edit ] The management of stored data generally involves two aspects: The management of the individual devices and their presentation as a single device is distinct from the management of the files held on that apparent device.
ZFS is unusual, because unlike most other storage systems, it unifies both of these roles and acts as both the volume manager and the file system.
Therefore, it has complete knowledge of both the physical disks and volumes including their condition and status, their logical arrangement into volumes, and also of all the files stored on them.
ZFS is designed to ensure subject to suitable hardware that data stored on disks cannot be lost due to physical errors or misprocessing by the hardware or operating systemor bit rot events and data corruption which may happen over time, and its complete control of the storage system is used to ensure that every step, whether related to file management or disk management, is verified, confirmed, corrected if needed, and optimized, in a way that storage controller cards and separate volume and file managers cannot achieve.
ZFS also includes a mechanism for snapshots and replication write a business model, including snapshot cloning ; the former is described by the FreeBSD documentation as one of its "most powerful features", having features that "even other file systems with snapshot functionality lack". Snapshots can be rolled back "live" or previous file system states can be viewed, even on very large file systems, leading to savings in comparison to formal backup and restore processes.
Summary of key differentiating features[ edit ] Examples of features specific to ZFS include: Designed for long term storage of data, and indefinitely scaled datastore sizes with zero data loss, and high configurability. Hierarchical checksumming of all data and metadataensuring that the entire storage system can be verified on use, and confirmed to be correctly stored, or remedied if corrupt.
Checksums are stored with a block's parent blockrather than with the block itself. This contrasts with many file systems where checksums if held are stored with the data so that if the data is lost or corrupt, the checksum is also likely to be lost or incorrect.
Can store a user-specified number of copies of data or metadata, or selected types of data, to improve the ability to recover from data corruption of important files and structures. Automatic rollback of recent changes to the file system and data, in some circumstances, in the event of an error or inconsistency.
Automated and usually silent self-healing of data inconsistencies and write failure when detected, for all errors where the data is capable of reconstruction. Data can be reconstructed using all of the following: The RAIDZ levels stripe data across only the disks required, for efficiency many RAID systems stripe indiscriminately across all devicesand checksumming allows rebuilding of inconsistent or corrupted data to be minimised to those blocks with defects; Native handling of tiered storage and caching devices, which is usually a volume related task.
Relevant tools are provided at a low level and require external scripts and software for utilization. Native data compression and deduplicationalthough the latter is largely handled in RAM and is memory hungry. For example, synchronous writes which are capable of slowing down the storage system can be converted to asynchronous writes by being written to a fast separate caching device, known as the SLOG sometimes called the ZIL — ZFS Intent Log.
Highly tunable — many internal parameters can be configured for optimal functionality. Can be used for high availability clusters and computing, although not fully designed for this use. Inappropriately specified systems[ edit ] Unlike many file systems, ZFS is intended to work towards specific aims.
Its primary targets are enterprise data management and commercial environments. We have shown in the previous section you can get incredible speeds out of the file system if you understand the limitations of your hardware and how to properly setup your raid.
Inadequate RAM — ZFS may use a large amount of memory in many scenarios; Inadequate disk free space — ZFS uses copy on write for data storage; its performance may suffer if the disk pool gets too close to full. The SLOG device is only used for writing apart from when recovering from a system error.
It can often be small for example, in FreeNASthe SLOG device only needs to store the largest amount of data likely to be written in about 10 seconds or the size of two 'transaction groups'although it can be made larger to allow longer lifetime of the device.
SLOG is therefore unusual in that its main criteria are pure write functionality, low latency, and loss protection — usually little else matters. While routine for other filing systems, ZFS handles RAID natively, and is designed to work with a raw and unmodified low level view of storage devices, so it can fully use its functionality.
Separate cards can also mislead ZFS about the state of data, for example after a crashor by mis-signalling exactly when data has safely been written, and in some cases this can lead to issues and data loss.Hire a highly qualified essay writer to cater for all your content needs.
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