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Re: Exposing FUA as alternative to DIOCCACHESYNC for WAPBL

On Fri, Mar 31, 2017 at 11:26:34AM +0200, Edgar Fuß wrote:
> > If the answer is that you're running with WCE on in the mode pages, then
> > don't do that:
> I don't get that. If you turn off the write cache, you need neither cache 
> flushes nor ordering, no?

You still need ordering. With tagged queuing, you have multiple commands
running at the same time (up to 256, maybe more fore newer scsi) and the drive
is free to complete them in any order.  Unless one of them is an ORDERED
command, in which case comamnds queued before have to complete before.

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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