[PVE-User] Ceph Cache Tiering

Lindsay Mathieson lindsay.mathieson at gmail.com
Wed Oct 12 14:14:53 CEST 2016

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 

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

Lindsay Mathieson

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