Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 23 of 29

A-Z

  1. Term

    Sanitization verification

    Sanitization verification inspects the outcome of a sanitization operation to determine whether the selected technique completed successfully.

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  2. Term

    SAS expander

    A SAS expander is a device in a SAS domain that routes connections between its phys, so that one initiator port can reach many more drives than the initiator has phys; it works as a circuit switch rather than a packet router.

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  3. Term

    SAS PHY event counters

    SAS PHY event counters are per-physical-link-endpoint counts of specified link events, including invalid DWORDs, disparity errors, synchronization loss and PHY reset problems.

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  4. Term

    SAS physical PHY

    The SAS physical-layer endpoint containing the transceiver that connects to another physical PHY over a link.

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  5. Term

    SAS wide port

    A SAS port containing more than one PHY, allowing separate connections across the port's links.

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  6. Term

    SATA Express

    A connector standard that multiplexed SATA and PCIe lanes for faster client storage before M.2 NVMe.

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  7. Term

    SATA PHY event counters

    SATA PHY event counters record distinct interface events in General Purpose Log 0x11 rather than measuring a disk failure rate.

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  8. Term

    SCSI

    Small Computer System Interface (SCSI) is a family of standards for device commands, logical units, status reporting and the transports that carry them.

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  9. Term

    SCSI CHECK CONDITION

    CHECK CONDITION is a SCSI command status used to report a condition described by sense information.

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  10. Term

    SCSI initiator and target

    In SCSI, the initiator is the endpoint that sends commands and the target is the endpoint that waits for them and performs the requested data transfers; the roles apply across parallel SCSI, Fibre Channel, iSCSI and other storage protocols.

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  11. Term

    SCSI persistent reservations

    SCSI persistent reservations control initiator access to a logical unit using registered keys and a selected reservation type.

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  12. Term

    SCSI sense key

    A SCSI sense key is a four-bit field identifying the broad category of a condition reported in sense data.

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  13. Term

    SCSI UNMAP

    A SCSI command that requests deallocation of specified logical block ranges.

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  14. Term

    SCSI VERIFY

    SCSI VERIFY checks selected logical blocks using verification semantics that depend on command fields and device behavior.

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  15. Term

    SD Express

    Secure Digital cards with a second row of pins for PCIe/NVMe attachment alongside legacy SD modes.

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  16. Term

    Secure erase

    Secure erase is a context-dependent label for a storage erasure procedure whose command, scope and assurance must be specified.

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  17. Term

    Seek time

    Seek time is the time a hard disk's actuator needs to move the head stack to the target track, made up of acceleration, coasting, deceleration and a final settling phase; it excludes the rotational delay and transfer time that follow.

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  18. Term

    Self-encrypting drive (SED)

    A self-encrypting drive encrypts stored data internally using integrated cryptographic and key-management capabilities.

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  19. Term

    sendfile

    sendfile is a Linux system call that transfers bytes between file descriptors within the kernel.

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  20. Term

    Sequencing coverage (DNA storage)

    Sequencing coverage in DNA storage measures reads relative to intended sequence identities, with the read population and aggregation rule explicitly specified.

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  21. Term

    Serial ATA (SATA)

    Serial ATA (SATA) is a serial storage interface that carries ATA commands between a host controller and a device.

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  22. Term

    Serial ATA Tunneled Protocol

    The SAS protocol that carries SATA communication through a SAS domain to an attached SATA device.

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  23. Term

    Serial Attached SCSI (SAS)

    An enterprise storage interface that extends SCSI semantics over a serial point-to-point or expander topology.

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  24. Term

    Serial Management Protocol

    The SAS protocol for management exchanges such as discovering and configuring expander topology.

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  25. Term

    Serial SCSI Protocol

    The SAS protocol that carries SCSI commands, task management, data and responses between initiator and target ports.

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  26. Term

    Serializability

    Serializability is a transaction-isolation property under which the read results and writes of committed concurrent transactions are equivalent to some serial execution of those transactions.

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  27. Term

    Session guarantees

    Session guarantees are consistency contracts for a session's operations, including read-your-writes, monotonic reads, monotonic writes and writes-follow-reads.

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  28. Term

    Set reconciliation

    Set reconciliation is the task of identifying items present in one of two sets but not the other.

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  29. Term

    Shingled band

    A shingled band is a group of overlapping magnetic tracks separated from neighboring bands by guard regions that limit overwrite propagation.

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  30. Term

    Shingled magnetic recording (SMR)

    An HDD recording method that overlaps tracks like roof shingles to raise areal density at the cost of rewrite behavior.

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