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ext4 uses a performance technique called allocate-on-flush, also known as delayed allocation. That is, ext4 delays block allocation until data is flushed to disk; in contrast, some file systems allocate blocks immediately, even when the data goes into a write cache. Delayed allocation improves performance and reduces fragmentation by ...
Allocate-on-flush (also called delayed allocation) is a file system feature implemented in HFS+, [1] XFS, Reiser4, ZFS, Btrfs, and ext4. [2] The feature also closely resembles an older technique that Berkeley's UFS called "block reallocation".
Also, extent allocation results in less file fragmentation. Extent-based file systems can also eliminate most of the metadata overhead of large files that would traditionally be taken up by the block-allocation tree. But because the savings are small compared to the amount of stored data (for all file sizes in general) but make up a large ...
3.4 Allocation and layout policies. 4 OS support. 5 Limits. ... ext4: various 2006 Linux: exFAT: Microsoft: ... Data checksum/ ECC Persistent Cache
ext4 – A follow-up for ext3 and also a journaled filesystem with support for extents. ext3cow – A versioning file system form of ext3. FAT – File Allocation Table, initially used on DOS and Microsoft Windows and now widely used for portable USB storage and some other devices; FAT12, FAT16 and FAT32 for 12-, 16-and 32-bit table depths.
Linux ext2, ext3, and ext4: Much like UFS, these filesystems employ allocation techniques designed to keep fragmentation under control at all times. [15] As a result, defragmentation is not needed in the vast majority of cases. [16] ext2 uses an offline defragmenter called e2defrag, which does not work with its successor ext3.
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The extended file system, or ext, was implemented in April 1992 as the first file system created specifically for the Linux kernel. Although ext is not a specific file system name, it has been succeeded by ext2, ext3, and ext4.