Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

1222 terms · Page 40 of 41

A-Z

  1. Term

    Write-once memory code

    A write-once memory code represents successive logical values using physical states that change only in a permitted direction between resets.

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  2. Term

    Write-through cache

    Write-through caching propagates writes to the backing store as part of completing them at the cache layer.

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  3. Term

    Writeback error

    A writeback error is a failure encountered while transferring modified cached data to its backing storage.

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  4. Term

    Writes-follow-reads

    Writes-follow-reads requires every replica incorporating a session write to incorporate and order before it the updates relevant to that session's earlier reads.

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  5. Term

    writev

    writev is a vectored I/O operation that writes an ordered array of buffers to a file descriptor and reports the total number of bytes transferred.

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  6. Term

    WSClock

    WSClock is a virtual-memory policy combining a CLOCK-style frame scan with working-set age estimates and task load control.

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  7. Term

    XFS

    XFS is an extent-based journaling filesystem that divides its data section into allocation groups and uses B-trees for filesystem metadata.

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  8. Term

    XFS Active Item List

    The XFS Active Item List is the LSN-ordered list of metadata items already in the journal but not yet written in place, whose oldest entry holds the log tail.

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  9. Term

    XFS Committed Item List

    The XFS Committed Item List tracks in-memory logged changes awaiting a journal checkpoint.

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  10. Term

    XFS deferred operation

    An XFS deferred operation postpones metadata work to a later transaction to satisfy locking or reservation constraints.

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  11. Term

    XFS delayed logging

    XFS delayed logging tracks changed metadata in memory and writes only the latest aggregated copy of each item to the journal at checkpoints.

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  12. Term

    XFS intent log item

    An XFS intent log item describes deferred work that log recovery may need to complete.

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  13. Term

    XFS relogging

    XFS relogging writes the accumulated, still unwritten changes of an object again in a newer transaction so that the object moves forward in the log.

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  14. Term

    XFS rolling transaction

    An XFS rolling transaction commits one step of a transaction chain and continues with a fresh transaction using a permanent log reservation.

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  15. Term

    XOR filter

    An XOR filter is a static approximate-membership structure that answers a lookup by comparing a key fingerprint with the XOR of three array entries.

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  16. Term

    XTS-AES

    XTS-AES is a tweakable AES mode for fixed-length storage data units that provides confidentiality without data expansion and without authenticating the data.

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  17. Term

    ZAC

    ZAC (Zoned Device ATA Command Set) is the ATA command set with which a host finds and controls zones of host-aware or host-managed SMR disks over SATA, the counterpart of SCSI ZBC.

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  18. Term

    Zarr

    Zarr is a specification family for storing chunked multidimensional arrays as metadata and encoded objects in a key-value store.

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  19. Term

    Zarr consolidated metadata

    Zarr consolidated metadata collects metadata for a hierarchy into a consolidated representation to reduce separate metadata reads.

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  20. Term

    Zarr fill value

    A Zarr fill value is the array-metadata value used to represent uninitialized elements, including absent chunk data under the format's read semantics.

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  21. Term

    ZBC

    ZBC (Zoned Block Commands) is the T10 SCSI command set for zoned block devices, whose host-managed model requires writes in sequential zones to start at the zone's write pointer.

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  22. Term

    Zero-copy I/O

    Zero-copy I/O is a data-transfer technique that avoids one or more payload copies between buffers or address spaces.

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  23. Term

    ZFS

    ZFS is a copy-on-write filesystem and storage-management architecture that shares pooled space among datasets and integrates data-integrity checks.

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  24. Term

    ZFS bookmark

    A ZFS bookmark is a snapshot-history reference that can anchor an incremental send without exposing the snapshot's file contents.

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  25. Term

    ZFS clone promotion

    ZFS clone promotion reverses the dependency between a clone and its origin dataset and transfers ownership of the origin snapshot and earlier snapshots to the promoted dataset.

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  26. Term

    ZFS dataset clone

    A ZFS dataset clone is a writable filesystem or volume created from a snapshot and initially sharing its data.

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  27. Term

    ZFS deferred snapshot destruction

    ZFS deferred snapshot destruction marks an ineligible snapshot for automatic deletion once its holds and clone dependencies no longer prevent removal.

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  28. Term

    ZFS error scrub

    A ZFS error scrub is an integrity scan restricted to files already recorded with data errors.

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  29. Term

    ZFS Intent Log

    The ZFS Intent Log is a per-dataset recovery log that can persist filesystem operations before their transaction group reaches stable storage.

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  30. Term

    ZFS raw send

    ZFS raw send writes the blocks of an encrypted dataset into a send stream exactly as they are stored, so the stream can be moved and received without the keys.

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