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title: About title: Welcome
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@ -21,13 +21,13 @@ To put it simply:
ZFS goes far beyond traditional file systems in terms of performance and features. ZFS goes far beyond traditional file systems in terms of performance and features.
Heres what were most interested in: Heres what were most interested in:
- Its __snapshot management__ features, allowing you to quickly roll back in case of issues. - Its __snapshot management__ features, allowing you to quickly roll back in case of issues.
- Its support for disk groupings and [__RAID-like structures__](/global/RAID) (Z-Mirror, RAIDZ1, RAIDZ2, RAIDZ3). - Its support for disk groupings and [__RAID-like structures__](/general/raid) (Z-Mirror, RAIDZ1, RAIDZ2, RAIDZ3).
- Its __automatic recovery of corrupted data__ (through scrubbing). - Its __automatic recovery of corrupted data__ (through scrubbing).
- Its performance, enhanced by RAM caching (ZFS ARC). - Its performance, enhanced by RAM caching (ZFS ARC).
- Its robust error notifications and monitoring. - Its robust error notifications and monitoring.
## Structure ## Structure
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![](/img/global/zfs.svg) ![](/img/global/zfs.svg)
ZFS has a unique structure: ZFS has a unique structure:
@ -42,14 +42,14 @@ There are several dataset types:
- **snapshot**: a frozen-in-time version of another dataset. Snapshots can be created manually or through backup tools. They can be mounted to browse data as it was at the snapshot time. - **snapshot**: a frozen-in-time version of another dataset. Snapshots can be created manually or through backup tools. They can be mounted to browse data as it was at the snapshot time.
## Why ZFS over others? ## Why ZFS over others?
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### Data Integrity ### Data Integrity
ZFS continuously checks that your stored data hasn't become corrupted. Every block of data is associated with a checksum, allowing ZFS to detect even the smallest alteration. If corruption is found and a healthy copy exists elsewhere, ZFS can repair the data automatically. ZFS continuously checks that your stored data hasn't become corrupted. Every block of data is associated with a checksum, allowing ZFS to detect even the smallest alteration. If corruption is found and a healthy copy exists elsewhere, ZFS can repair the data automatically.
### Built-in RAID ### Built-in RAID
ZFS includes its own volume management system (vdevs). You can build a zpool using multiple disks—similar to traditional [RAID](/global/RAID) setups—but with more flexibility. For example: ZFS includes its own volume management system (vdevs). You can build a zpool using multiple disks—similar to traditional [RAID](/general/raid) setups—but with more flexibility. For example:
- **Z-mirror** → equivalent to RAID 1 - **Z-mirror** → equivalent to RAID 1
- **RAIDZ1** → equivalent to RAID 5 (tolerates 1 disk failure) - **RAIDZ1** → equivalent to RAID 5 (tolerates 1 disk failure)
- **RAIDZ2** → equivalent to RAID 6 (tolerates 2 disk failures) - **RAIDZ2** → equivalent to RAID 6 (tolerates 2 disk failures)
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::alert{type="info"} ::alert{type="info"}
:::list{type="info"} :::list{type="info"}
- Check out the [article on RAID](/global/RAID) to find the right solution for your needs. - Check out the [article on RAID](/general/raid) to find the right solution for your needs.
::: :::
:: ::