btrfs?

btrfs?

Maybe so, but there's quite a lot of catch-up to do. Once you have COW, transactions, and checksums, then you want self-healing; then snapshots; pools; quotas; compression; and so on, until you eventually have something like ZFS. :)

Linus' grandstanding aside, it's possible there is quiet work going on to improve the situation, as David Magda commented on zfs-discuss:

Somewhat off topic, but it seems that someone released a COW file system for Linux (currently in 'alpha'):

	* Extent based file storage (2^64 max file size)
	* Space efficient packing of small files
	* Space efficient indexed directories
	* Dynamic inode allocation
	* Writable snapshots
	* Subvolumes (separate internal filesystem roots)
	- Object level mirroring and striping
	* Checksums on data and metadata (multiple algorithms available)
	- Strong integration with device mapper for multiple device support
	- Online filesystem check
	* Very fast offline filesystem check
	- Efficient incremental backup and FS mirroring

	http://lkml.org/lkml/2007/6/12/242
	http://oss.oracle.com/~mason/btrfs/

Via Storage Mojo

	

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