On Tue, Oct 22, 2013 at 11:23:43AM -0700, Richard Elling wrote: > On Oct 21, 2013, at 2:40 PM, Keith Wesolowski <[email protected]> > wrote: > > On Mon, Oct 14, 2013 at 01:22:45PM -0700, Matthew Ahrens wrote: > > commit 9dcb97198338ba2d8764dd5604b278118612f74d > Author: Brian Behlendorf <[email protected]> > Date: Thu Oct 25 13:02:31 2012 -0700 > > Log I/Os longer than zio_delay_max (30s default) > > seems reasonable; I'd want to get input from others who are > more familiar > with FMA. > > This doesn't seem relevant: we don't even have zio_delay_max, and in > illumos if an I/O never completes we hit the deadman and panic (which > seems right to me, since I don't see how you recover from this). I'd > also be curious to know what's being done with this telemetry other > than > exposure via 'zfs events'. > > I can see where people want to know when I/Os take a suspiciously long time. > I could also argue that 30 seconds is an arbitrary and probably not useful > guess > for the general case. Of course, the default in Solaris (sd) is 60 seconds, > which is > equally arbitrary and arguably useless. > > The question is: does this log I/Os that have not completed in 30 seconds, or > does > it log I/Os that have completed in more than 30 seconds? The difference is > subtle, > but important.
IIRC, it logs the error at IO completion time. -- Cheers, Prakash > -- richard > > -- > > [email protected] > +1-760-896-4422 > > > > > > > > > > illumos-zfs | Archives [http://postlink.www.listbox.com/1598485/ > > [http://postlink.www.listbox.com/1598486/3379085af0f1cf7fc3708f04b4471ae2/23963346/ > 833487e62783d55fe81f119fb93ef644/23963346/ > > 8cdfacfb.png?uri=aHR0cHM6Ly93d3cubGlzdGJveC5jb20vaW1hZ2VzL2xpc3Rib3gtbG9nby1zbWFsbC5wbmc] > 8cdfacfb.jpg?uri=aHR0cHM6Ly93d3cubGlzdGJveC5jb20vaW1hZ2VzL2ZlZWQtaWNvbi0xMHgxMC5qcGc] > | Modify Your Subscription _______________________________________________ developer mailing list [email protected] http://lists.open-zfs.org/mailman/listinfo/developer
