Hey guys, I've run into another ZFS performance disaster that I was hoping someone might be able to give me some pointers on resolving. Without any significant change in workload write performance has dropped off dramatically. Based on previous experience we tried deleting some files to free space, even though we're not near 60% full yet. Deleting files seemed to help for a little while, but now we're back in the weeds.
We already have our metaslab_min_alloc_size set to 0x500, so I'm reluctant to go lower than that. One thing we noticed, which is new to us, is that zio_state shows a large number of threads in CHECKSUM_VERIFY. I'm wondering if that's generally indicative of anything in particular. I've got no errors on any disks, either in zpool status or iostat -e. Any ideas as to where else I might want to dig in to figure out where my performance has gone? Thanks -Charles
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