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


From: Denis V. Lunev
Subject: Re: [Qemu-devel] [PATCH RFC 0/5] disk deadlines
Date: Tue, 8 Sep 2015 13:13:26 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

On 09/08/2015 01:11 PM, Kevin Wolf wrote:
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
this sounds reasonable. Noted for the next iteration.



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