On Jun 12, 2011, at 4:18 PM, Jim Klimov wrote: > 2011-06-12 23:57, Richard Elling wrote: >> >> How long should it wait? Before you answer, read through the thread: >> http://lists.illumos.org/pipermail/developer/2011-April/001996.html >> Then add your comments :-) >> -- richard > > Interesting thread. I did not quite get the resentment against > a tunable value instead of a hard-coded #define, though.
Tunables are evil. They increase complexity and lead to local optimizations that interfere with systemic optimizations. > Especially if we might want to somehow tune it per-device, > i.e. CDROM, enterprise SAS and some commodity drive or a > USB stick (or a VMWare emulated HDD, as Ceri pointed out) > might all be plugged into the same box and require different > timeouts only the sysadmin might know about (the numeric > values per-device). So I'd rather go with some hardcoded > default and many tuned lines in sd.conf, probably. yuck. I'd rather have my eye poked out with a sharp stick. > But the point of my previous comment was that, according > to the original poster, after a while his disk did get > marked as "faulted" or "offlined". IF this happened > during the system's initial uptime, but it froze anyway, > it it a problem. > > What I do not know is if he rebooted the box within the > 5 minutes set aside for the timeout, or if some other > processes gave up during the 5 minutes of no IO and > effectively hung the system. Not likely. Much more likely that that which you were expecting was blocked. > If it is somehow the latter - that the inaccessible drive > did (lead to) hang(ing) the system past any set IO retry > timeouts - that is a bug, I think. > > But maybe I'm just too annoyed with my box hanging with > a more-or-less reproducible scenario, and now I'm barking > up any tree that looks like system freeze related to IO ;) Yep, a common reaction. I think we can be more creative... -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
