Storage Knowledge Corpus: page 26

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Storage immutability

Storage immutability prevents specified data from being overwritten or deleted under an enforced retention rule or hold.

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Storage latency

Storage latency is the elapsed time between specified start and completion events for an I/O operation, including any delays inside those measurement boundaries.

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Storage snapshot

A storage snapshot is a point-in-time representation of a filesystem or volume, whose implementation may share blocks with its source.

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Storage throughput

Storage throughput is the amount of data transferred per unit time at a specified system boundary, usually expressed in bytes per second.

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Storage virtualization abstracts or hides the internal functions of storage devices or services from hosts and applications, for example by aggregating several physical disks or arrays into pooled logical volumes (block aggregation) that hosts see as one device, in the host, in the network or in the storage system.

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Storage-class memory (SCM)

Storage-class memory (SCM) is non-volatile solid-state memory that sits between DRAM and block storage in latency, is often byte-addressable, and is used as a persistence or capacity tier close to the CPU.

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Striping (storage)

Striping splits a logical block address range into fixed-size chunks and assigns consecutive chunks to different member devices in rotation, so that large or concurrent I/O can be served by several devices in parallel.

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Submission latency (fio)

Submission latency in fio is the elapsed time from initialization of an I/O unit to an engine-dependent submission boundary.

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Subpacketization

Subpacketization is the number of base-field symbols stored by each node for one codeword in a vector erasure code.

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Succinct range filter

An approximate point-and-range membership structure based on a truncated order-preserving Fast Succinct Trie.

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Superparamagnetic limit

The superparamagnetic limit is a thermal-stability constraint arising when magnetic reversal becomes too likely over the required storage time.

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Survival function

The survival function S(t) = P(T > t) is the probability that a time T to a defined event exceeds t, measured from a specified time origin.

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Symbol erasure

A symbol erasure is a codeword position whose value is unavailable or deliberately discarded and whose location is known to the decoder.

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sync_file_range

sync_file_range is a Linux-specific operation that initiates or waits for page-cache writeback over a file range without synchronizing file metadata or flushing volatile device write caches.

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syncfs

syncfs is a Linux system call that synchronizes pending file data and metadata for the filesystem selected by an open file descriptor.

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Synchronous replication

Synchronous replication makes successful completion depend on acknowledgement that a specified set of replicas has reached the processing stage required by the replication contract.

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Synthetic full backup

A synthetic full backup reconstructs a complete backup for a selected recovery point from retained full and incremental backup data without rereading the entire protected dataset from production.

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Systematic code

A systematic code includes the original data symbols unchanged among its encoded symbols.

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Tail latency

Tail latency describes the high-latency part of an operation response-time distribution, usually summarized using specified high percentiles.

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Tape buffer synchronization

Tape buffer synchronization is completion of a supported operation that confirms previously buffered tape data and marks have been written to the medium.

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Tape encryption

Tape encryption is the encryption of data blocks by the tape drive (or a host or appliance) before they are recorded on a cartridge, in LTO drives typically with 256-bit AES in Galois/Counter Mode, so that a cartridge read without the key is unreadable.

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Tape filemark

A tape filemark is a recorded logical delimiter separating files in a sequential tape stream.

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Tape library

A tape library is an automated system in which a robotic mechanism moves tape cartridges between storage slots and one or more tape drives, so that many cartridges can be mounted without an operator.

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TapeAlert

TapeAlert is a SCSI status-reporting mechanism for tape devices that exposes condition flags through LOG SENSE page 2Eh.

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TBW

TBW (terabytes written) is an SSD endurance rating expressed as cumulative host-write volume under a specified workload and qualification conditions.

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TCG Opal

TCG Opal is a Trusted Computing Group specification for managing hardware encryption on self-encrypting storage devices: it defines authorities and credentials, locking ranges that can be locked and erased independently, and a pre-boot shadow area, and is carried over ATA or NVMe security commands.

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tee (Linux system call)

The Linux tee system call duplicates pipe-buffer data into another pipe without consuming the original pipe's data.

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Temporal validation

Temporal validation evaluates a predictor on later observations using training information available before the evaluation boundary.

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Temporary read errors (NAND)

Temporary read errors are a reversible excess of raw bit errors observed in initial reads of some 3D NAND blocks after an idle interval.

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Thermal flying-height control (TFC)

Thermal flying-height control uses an embedded heater to adjust HDD head-disk clearance through local thermal protrusion.

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