> As Dan said, it looks like ZFS is busy. That's very odd, as the system isn't doing anything I/O heavy. It has only a single zpool of five devices in a raidz serving a single filesystem, and that filesystem only writes logs at a rate of about 10MB/s. ZFS compression is turned off.
> How much RAM is on this system? > What release of Solaris? The system is a Sun Fire X4440 with 16 cores (4 x Quad-Core AMD Opteron(tm) Processor 8356s running at 2.3Ghz) with 64G of RAM. It is running sol10update5, kernel patch level 138889-06. > Do you have any ZFS tweaks in /etc/system? > (like clamping the ARC size...) > Is the system memory constrained? Nothing in /etc/system. System memory is not strained (swap is never touched). > The xcalls are due to the page unmaps out of > what I'm assuming is the ZFS ARC (although > I'm not 100% sure about that - I need to check > the source for segkmem_zio_free()) > > Can you gather some ZFS IO statistics, like > "fsstat zfs 1" for a minute or so. I'll have to wait until later in the day when this usually starts happening, and then I'll post back with results. Thanks to everyone for their help thus far. It will be very interesting to see what fsstat shows. -- This message posted from opensolaris.org _______________________________________________ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
