![]() ZIL/SLOG A “Separate intent log” (SLOG) is a high speed write cache device for storing the “ZFS intent log” (ZIL). Each snapshot can preserve archival data, be replicated to another system, or be used to rollback after a bad event such as malware or ransomware attack. Snapshot A point-in-time, read-only, copy of a file system or volume that does not get changed when new data is written. ZVOL ZVOLs are datasets that represent block devices Internet Small Computer Systems Interface (ISCSI) and Fibre Channel (FC). Each dataset can be snapshotted, cloned, and configured for any use case and have child datasets with their own distinct properties. Dataset A virtual filesystem without the restrictions of a fixed-size partition. ![]() It is continuously used for the detection and repair of data corruption via a “scrub” process. Checksum A Checksum is an additional integrity check on data that is written separately from the data. If a drive fails, the data can be rebuilt (“resilvered”) to a spare drive to prevent data loss. RAIDZ can use either single (Z1), dual (Z2), or triple (Z3) parity for data protection. RAIDz RAIDZ Combines disk drives and data storage devices into a single virtual storage device. A vdev has many configurations including: single disk, stripe, RAIDZ1, RAIDZ2, RAIDZ3, or mirror. ZFS vdev A vdev is a top-level RAID “virtual device” compromising one or more drives. ![]() ZFS is Enterprise-grade and highly scalable, requiring new concepts and terminology to differentiate its practices from standard filesystems: ![]()
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