> In Solaris 10u8: > root@nas-hz-01:~# uname -a > SunOS nas-hz-01 5.10 Generic_141445-09 i86pc i386 i86pc > root@nas-hz-01:~# echo "metaslab_min_alloc_size/K" | mdb -kw > mdb: failed to dereference symbol: unknown symbol name Fair enough. I don't have anything older than b147 at this point so I wasn't sure if that was in there or not.
If you delete a bunch of data (perhaps old files you have laying around) does your performance go back up- even if temporarily? The problem we had matches your description word for word. All of a sudden we had terrible write performance with a ton of time spent in the metaslab allocator. Then we'd delete a big chunk of data (100 gigs or so) and poof- performance would get better for a short while. Several people suggested changing the allocation free percent from 30 to 4 but that change was already incorporated into the b147 box we were testing. The only thing that made a difference (and I mean a night and day difference) was the change above. That said- I have no idea how that part of the code works in 10u8. -Don _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
