On Mon, Feb 16, 2015 at 10:48 AM, Eliezer Croitoru <eliezer@xxxxxxxxxxxx> wrote:
> Thanks Chris for the detailed response!
>
> I couldn't understand the complex sentence about XFS and was almost
> convinced that XFS might offer a new way to spread across multiple disks.
It's not new in XFS, it's behaved like this forever. But it's new in
that other filesystems don't allocate this way. I'm not aware of any
other filesystem that does.
Btrfs could possibly be revised to do this somewhat more easily than
other fs's since it also has a concept of allocation chunks. Right now
its single data profile allocates in 1GB chunks until full, and the
next 1GB chunk goes on the next device in a sequence mainly determined
by free space. This is how it's able to use different sized devices
(including raid0,1,5,6). So it can read files from multiple drives at
the same time, but it tends to only write to one drive at a time
(unless using one of the striping raid-like profiles).
--
Chris Murphy
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