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Block suballocation information


Block suballocation is a feature of some computer file systems which allows large blocks or allocation units to be used while making efficient use of empty space at the end of large files, space which would otherwise be lost for other use to internal fragmentation.[1]

In file systems that don't support fragments, this feature is also called tail merging or tail packing because it is commonly done by packing the "tail", or last partial block, of multiple files into a single block.

  1. ^ U.S. patent 6,041,407 (Fundamental patent.)

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Block suballocation

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Block suballocation is a feature of some computer file systems which allows large blocks or allocation units to be used while making efficient use of empty...

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Comparison of file systems

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a corresponding suballocation block chain in which all the tails of that size are stored. The overhead of managing suballocation block chains is usually...

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VMware VMFS

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for 8 MB block sizes. VMFS5 uses 1 MB blocks throughout (with block suballocation for small files), and has a file size limit of 62 TB, though the VMDK...

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NetWare File System

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journaling (Novell Transaction Tracking System a.k.a. TTS) Support for block suballocation, starting in NetWare 4.x For larger files, the file system utilized...

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Unix File System

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file must occupy at least one block. Because of this, BSD added block-level fragmentation, also called block suballocation, tail merging, or tail packing...

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Reiser4

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support of small files, in terms of disk space and speed through block suballocation Liquid items (or virtual keys) – a special format of records in the...

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Memory management

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how the system is generated, e.g., for PCP, MFT, MVT. In OS/360 MVT, suballocation within a job's region or the shared System Queue Area (SQA) is based...

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