@martin @daftaupe
Tried btrfs à long time ago. Snapshots Can be great for OS Drive. But for data storage nothing Can Beat mdadm+lvm2. Big problem with btrfs : you can't know how much space is still available. (At the Time i checked it at least.)

@hoper @martin You can use btrfs filesystem df for example to know how much space is available (or used). or btrfs filesystem du to get details about a particular file.

@daftaupe @martin
Seems that things change, but according to the FAQ, there are still some issues with this matter (know how much Space left and use it)
btrfs.wiki.kernel.org/index.ph
Il still think that mixing réplication (raid) and file system is a very bad idea.

@hoper @daftaupe @martin why would you think mixing FS/RAID is a bad idea? I'd argue it is a very good idea :)

Suivre

@fink @daftaupe @martin
Last thing about the layer model. Sometimes you don't need all layers. For example you don't always need a file system. Think about swap, or about oracle or other database software that will work better if you just give them raw devices, because they have their own integrated "file system". Can you make a "raw volume" (without any fs or metadata or whatever on it) with btrfs ?

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