G-Technology G-RACK 12, User Manual

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F.A.Q.
p. 261
wrote around 24 million files of different size and layout. XFS takes 430 seconds to complete the
operations and it was performance bound by its log system; EXT4 took 200 seconds to complete
the test, and its limit comes from the fixed inode locations. Both limits are the results of their design,
and overcoming of those limits was one of the original goal of BTRfs. Did they succeed? The same
test took 62 seconds to be completed on BTRfs, and the limit was the CPU and Memory of the test
system, while both XFS and EXT4 were able to use only around 25% of the available CPU because
they were quickly IO bound.
The main BTRfs features available the G-RACK 12 include:
• Extent based file storage
• 2^64 byte == 16 EiB maximum file size (practical limit is 8 EiB due to Linux VFS)
• Space-efficient packing of small files
• Space-efficient indexed directories
• Dynamic inode allocation
• Writable snapshots, read-only snapshots
• Subvolumes (separate internal filesystem roots)
• Checksums on data and metadata (crc32c)
• Compression (zlib and LZO)
• Integrated multiple device support
• File Striping, File Mirroring, File SMirroring, Striping with Single and Dual Parity
implementations (RAID-5 and RAID-6)
• Background scrub process for finding and fixing errors on files with redundant copies
• Online filesystem defragmentation
• Offline filesystem check.
• Subvolume-aware quota support
• Online filesystem check
BTRfs Links and references
Informative Links about BTRfs:
• https://www.reddit.com/r/btrfs/
• https://btrfs.wiki.kernel.org/index.php/Main_Page
• https://en.wikipedia.org/wiki/Btrfs
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