Re: [Qemu-devel] [PATCH RFC 0/5] disk deadlines

[Kevin Wolf]

Am 08.09.2015 um 11:20 hat Fam Zheng geschrieben:
> [Cc'ing address@hidden
> 
> On Tue, 09/08 11:00, Denis V. Lunev wrote:
> > To avoid such situation this patchset introduces patch per-drive option
> > "disk-deadlines=on|off" which is unset by default.
> 
> The general idea sounds very nice. Thanks!
> 
> Should we allow user configuration on the timeout?  If so, the option should 
> be
> something like "timeout-seconds=0,1,2...".  Also I think we could use werror
> and rerror to control the handling policy (whether to ignore/report/stop on
> timeout).

Yes, I think the timeout needs to be configurable. However, the only
action that makes sense is stop. Everything else would be unsafe because
the running request could still complete at a later point.

Another question I have related to safety is whether (and how) you can
migrate away from a host that has been stopped because of a timeout. I
guess migration needs to be blocked then?

Kevin