On Tue, Aug 09, 2011 at 10:51:37AM +1000, Daniel Carosone wrote: > On Mon, Aug 01, 2011 at 01:25:35PM +1000, Daniel Carosone wrote: > > To be clear, the system I was working on the other day is now running > > with a normal ashift=9 pool, on a mirror of WD 2TB EARX. Not quite > > what I was hoping for, but hopefully it will be OK; I won't have much > > chance to mess with it again for a little while. > > That turned out to be a false hope. The system is almost unusable. > > Soon after anything creates a lot of metadata updates, it grinds into > the ground doing ~350 write iops, 0 read, forever trying to write them > out. Processes start blocking on reads and/or txg closes and the > system never comes back. rsync and atimes were the first and worst > culprit, but atime=off wasn't enough to prevent it competely.
With a bit of tweaking of workload, I bought enough time to put this off. > It can't just be that these are slow to write out, because I would > expect it to eventually finish. I suspect something else is going on > here. That something, apparently, was thrashing on swap space. :-/ > I'll have to find time to convert this bac to ashift=12 and try your > boot blocks soon. I see via the issue tracker that there have been several updates since, and an integration back into the main Illumos tree. How do I go about getting hold of current boot blocks? -- Dan.
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