Am Fri, 25 Nov 2016 09:28:40 +0100
schrieb Ulli Horlacher [off-list ref]:

I have vmware and virtualbox VMs on btrfs SSD.

I read in
https://btrfs.wiki.kernel.org/index.php/SysadminGuide#When_To_Make_Subvolumes

     certain types of data (databases, VM images and similar
typically big files that are randomly written internally) may require
CoW to be disabled for them.  So for example such areas could be
placed in a subvolume, that is always mounted with the option
"nodatacow".

Does this apply to SSDs, too?

As a side note: I don't think you can use "nodatacow" just for one
subvolume while the other subvolumes of the same btrfs are mounted
different. The wiki is just wrong here.

The list of possible mount options in the wiki explicitly lists
"nodatacow" as not working per subvolume - just globally for the whole
fs.

-- 
Regards,
Kai

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