Re: Is there a "nossd" option ?

[Roman Mamedov <rm@romanrm.net>]

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On Sun, 21 Jun 2015 19:13:10 +0200
Swâmi Petaramesh <swami@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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