Difference between revisions of "RAID-Z"
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RAID-Z integrates redundancy, performance, and data integrity within ZFS's architecture using copy-on-write and checksumming mechanisms. | RAID-Z integrates redundancy, performance, and data integrity within ZFS's architecture using copy-on-write and checksumming mechanisms. | ||
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=== RAID-Z Levels === | === RAID-Z Levels === | ||
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=== Limitations === | === Limitations === | ||
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=== See Also === | === See Also === | ||
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* [[RAID]] | * [[RAID]] | ||
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| − | + | [[Category:Information]] | |
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Latest revision as of 19:44, 12 June 2025
RAID-Z
RAID-Z is a data protection technology used by the ZFS file system. It is a variation of traditional RAID-5/RAID-6 but specifically designed to overcome the limitations and risks associated with conventional RAID, particularly the "write hole" problem.
RAID-Z integrates redundancy, performance, and data integrity within ZFS's architecture using copy-on-write and checksumming mechanisms.
RAID-Z Levels
ZFS supports three levels of RAID-Z:
| Level | Parity | Fault Tolerance | Minimum Disks | Description |
|---|---|---|---|---|
| RAID-Z1 | Single parity | 1 disk failure | 3 | Similar to RAID-5 |
| RAID-Z2 | Double parity | 2 disk failures | 4 | Similar to RAID-6 |
| RAID-Z3 | Triple parity | 3 disk failures | 5 | Unique to ZFS; ideal for large arrays |
Limitations
- No native support outside ZFS (tied to ZFS structure)
- More RAM usage (ZFS recommends at least 8 GB; more for deduplication)
- RAID-Z arrays cannot be shrunk or have disks removed (though vdevs can be added)
Use Cases
- Enterprise servers requiring high data integrity
- Backup and archival storage
- Virtualization hosts (e.g., Proxmox)
- NAS systems and home media servers using ZFS
