Re: [Nbd] request queue
- To: Nicolas Trangez <nicolas@...1262...>
- Cc: nbd-general@lists.sourceforge.net
- Subject: Re: [Nbd] request queue
- From: Wouter Verhelst <w@...112...>
- Date: Tue, 12 Mar 2013 11:13:40 +0100
- Message-id: <20130312101340.GD31419@...3...>
- In-reply-to: <1363082402.10231.0.camel@...1263...>
- References: <20130311200707.GJ1911@...855...> <20130312075918.GB29217@...3...> <20130312084700.GM1911@...855...> <20130312095611.GB19175@...1266...> <1363082402.10231.0.camel@...1263...>
On Tue, Mar 12, 2013 at 11:00:02AM +0100, Nicolas Trangez wrote:
> On Tue, 2013-03-12 at 10:56 +0100, Goswin von Brederlow wrote:
> > can complete in any order unless FUA/FLUSH is used
>
> Care to elaborate what the constraints are in these cases? I can't
> remember reading anything about this while working on my library.
FUA means "this request must have hit disk before the server
acknowledges the FUA".
FLUSH is a barrier, i.e., "all requests before this flush must have hit
disk before the FLUSH is acknowledged".
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