ZFS Intent Log
E339022
The ZFS Intent Log (ZIL) is a write-ahead logging mechanism in the ZFS file system that safely records synchronous write operations to ensure data integrity and rapid recovery after crashes.
All labels observed (1)
| Label | Occurrences |
|---|---|
| ZFS Intent Log canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3244752 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: ZFS Intent Log Context triple: [ZFS, feature, ZFS Intent Log]
-
A.
ZFS file system
The ZFS file system is a combined file system and logical volume manager known for its advanced features like data integrity verification, snapshots, and efficient storage management, originally created for enterprise-grade reliability and scalability.
-
B.
Btrfs
Btrfs is a modern copy-on-write Linux file system designed for advanced features like snapshots, checksumming, and efficient storage management.
-
C.
ReiserFS
ReiserFS is a journaling file system for Linux known for its efficient handling of small files and advanced tree-based storage structures.
-
D.
F2FS
F2FS (Flash-Friendly File System) is a Linux file system optimized for NAND flash-based storage devices, designed to improve performance and lifespan on solid-state media.
-
E.
XFS
XFS is a high-performance 64-bit journaling file system originally developed by SGI, widely used on Linux for handling large files and parallel I/O workloads.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: ZFS Intent Log Target entity description: The ZFS Intent Log (ZIL) is a write-ahead logging mechanism in the ZFS file system that safely records synchronous write operations to ensure data integrity and rapid recovery after crashes.
-
A.
ZFS file system
The ZFS file system is a combined file system and logical volume manager known for its advanced features like data integrity verification, snapshots, and efficient storage management, originally created for enterprise-grade reliability and scalability.
-
B.
Btrfs
Btrfs is a modern copy-on-write Linux file system designed for advanced features like snapshots, checksumming, and efficient storage management.
-
C.
ReiserFS
ReiserFS is a journaling file system for Linux known for its efficient handling of small files and advanced tree-based storage structures.
-
D.
F2FS
F2FS (Flash-Friendly File System) is a Linux file system optimized for NAND flash-based storage devices, designed to improve performance and lifespan on solid-state media.
-
E.
XFS
XFS is a high-performance 64-bit journaling file system originally developed by SGI, widely used on Linux for handling large files and parallel I/O workloads.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
ZFS component
ⓘ
file system log ⓘ write-ahead logging mechanism ⓘ |
| alsoKnownAs |
ZIL
ⓘ
linked to:
ZIL automobile plant
|
| benefit |
reduces recovery time after system crashes
ⓘ
reduces risk of data loss for committed synchronous writes ⓘ |
| canBeStoredOn |
main pool devices
ⓘ
separate log devices ⓘ |
| category |
crash recovery mechanism
ⓘ
data integrity mechanism ⓘ file system technology ⓘ |
| contrastsWith | traditional journaling file system logs ⓘ |
| dataPath | write path only ⓘ |
| dependsOn |
ZFS copy-on-write design
ⓘ
ZFS transaction groups ⓘ |
| designedFor |
crash recovery
ⓘ
power failure scenarios ⓘ |
| effectOnPerformance |
adds overhead to synchronous writes
ⓘ
can improve latency when placed on fast devices ⓘ |
| ensures |
POSIX synchronous write semantics
ⓘ
ordering of synchronous writes ⓘ |
| failureHandling |
discards clean log when no pending synchronous writes exist
ⓘ
replays pending log records after crash ⓘ |
| hasProperty |
does not normally participate in read operations
ⓘ
log is logically ordered ⓘ log is replayed only when needed ⓘ |
| implementationDetail |
log records are discarded after being safely committed to main storage
ⓘ
log records are replayed after a crash if needed ⓘ stores log records describing future changes ⓘ |
| introducedBy | Sun Microsystems ⓘ |
| loggingMode | write-ahead logging ⓘ |
| loggingType | intent log ⓘ |
| notUsedDuring | purely asynchronous writes ⓘ |
| operatesAt |
ZFS dataset level
ⓘ
ZFS pool level ⓘ |
| partOf |
ZFS
ⓘ
linked to:
ZFS file system
|
| primaryPurpose |
enable rapid recovery after crashes
ⓘ
ensure data integrity for synchronous writes ⓘ |
| records |
synchronous write operations
ⓘ
transaction intents ⓘ |
| relatedConcept | separate intent log (SLOG) ⓘ |
| scope | only synchronous writes are forced to ZIL ⓘ |
| usedBy |
OpenZFS
ⓘ
linked to:
ZFS file system
Oracle ZFS ⓘ
linked to:
ZFS file system
|
| usedDuring | synchronous write operations ⓘ |
| usedIn | ZFS file system ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: ZFS Intent Log Description of subject: The ZFS Intent Log (ZIL) is a write-ahead logging mechanism in the ZFS file system that safely records synchronous write operations to ensure data integrity and rapid recovery after crashes.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
ZFS file system