[PVE-User] Ceph Cache Tiering

[Lindsay Mathieson]

On 12/10/2016 9:55 PM, Adam Thompson wrote:
> Ultimately, "Always Use DirectIO" is a religious belief, not a technically sound belief.  There are situations where it makes sense, and other situations where it doesn't.  The same can be said of*every single*  setting - if there were only One True Correct Setting, it wouldn't be available as a user-settable option in the first place!
> -Adam

I wasn't meaning WriteBack or Direct-IO - there is also WriteThrough. I 
found with ZFS + SSD SLOG writethrough performance was the same as 
writeback.


But yah, there is no onesize fits all setting ;)

-- 
Lindsay Mathieson