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An unexpected perf feature
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A look at the PyPy 2.0 release
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The most important reason in my mind is connecting the transaction domains of the storage management with the rest of the filesystem. It makes it much more efficient to move storage around without having to wonder if the FS is currently using it.
Btrfs aims for the mainline
Posted Jan 9, 2009 0:29 UTC (Fri) by roblucid (subscriber, #48964)
Presumbably there's similar issues with the "array of blocks/bytes" idea, when it comes to disks themselves. It shows with Flash, where it'd be nice to let the device know blocks are unused. Perhaps with bad block reallocation to on disks, which might have unpleasant consequences for journal files (without barriers).
It used to be, that disks were always damn near full, so you didn't really gain anything by not doing a raw partition copy when transfering data from one disk to another.
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