On Sun, 21 Jun 2015 19:13:10 +0200 Swâmi Petaramesh <sw...@petaramesh.org> wrote:
> Hi, > > Running a 3.19 Ubuntu kernel, > > I'm currently budling a RAID-1 BTRFS set for which every underlying device is > a LUKS-encrypted device itself built out of a bcache device comprised of a > mechanical HD partition + an SSD cache partition. > > Looks like it's working. > > BUT I see that BTRFS decides by itself to mount with the "ssd" option as > bcache makes it think the device is not "rotational". > > However I feel that a mechanical HD plus SSD bcache should probably not be > "SSD-optimized" as the underlying storage is indeed mechanical and bcache > already manages the SSD part optimization by itself - and I'm afraid the "SSD > optimization" could actually cause the mechanical storage to end up being > much > more fragmented than it should... > > So the question is : Is there a mount option such as "nossd" that I could use > to inhibit the automatic SSD "choice" that BTRFS makes ? Yes the "nossd" option (written literally like that) does in fact exist. It would have taken you less time to try if it works, than to write this long-winded message. :) -- With respect, Roman
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