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Mon, 24 Mar 2008

BTRFS got subvolumes support.

Subvolumes are block devices on top of which btrfs can be created. This is first known filesystem in Linux which can be built on top of multiple block devices. Chris Mason renamed his unstable branch to really-really unstable because of that. It is possible to put devices into mirror or striping mode, although it is far from being clear from short mail description.

Although support for mirror and striping in filesystem is questionable feature, ability to create filesystem on top of multiple block devices with per-device allocation policies is a huge step in Linux filesystem development.

/devel/fs :: Link / Comments (2)

Jon wrote at 2008-03-25 13:25:

Why is it such a good thing? Isnt' having that stuff separated out into device mapper a good idea?

Zbr wrote at 2008-03-25 14:33:

Because of per-device allocation policy: for example some kind of files can be created solely on device A, metadata can be placed on device B and so on. At the lower layer each device can be a mirror or whatever. I briefly described my thoughts on it here: http://tservice.net.ru/~s0mbre/blog/devel/dst/2008_01_31.html

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