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HAMMER
HAMMER is a high-availability 60-bit file system developed by Matthew Dillon for DragonFly BSD using B+trees. Its major features include infinite NFS-exportable snapshots, master-multislave operation, configurable history retention, fsckless-mount, and checksums to deal with data corruption.〔 HAMMER also supports data block deduplication, meaning that identical data blocks will be stored only once on a file system.〔
== Features ==
HAMMER file system provides configurable fine-grained and coarse-grained filesystem histories with online snapshots availability. Up to 65536 ''master'' (read-write) and ''slave'' (read-only) pseudo-filesystems (PFSs), with independent individual retention parameters and inode numbering, may be created for each file system; PFS may be mirrored to multiple slaves both locally or over network connection with near real-time performance. No file system checking is required on remount.〔〔〔〔
HAMMER supports volumes up to 1 EiB of storage capacity. File system supports CRC checksumming of data and metadata, online layout correction and data deduplication, and dynamic inodes allocation with effectively unlimited number of inodes.〔〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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