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this doesn't change the status of OpenSolaris.
OpenSolaris will is incompatible with Solaris in many notable ways. (e.g. uses GNU for libstdc++.)
Losing free Solaris x86 means I can no longer recommend it -- not when CentOS, a 100% ABI-compatible RHEL clone, exists.
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Zones too. I think they offer more then what the usual jail does. Never really used both of them, but.. yeah, zones sound nice, too :) Also, solaris is probably the most stable OS i've ever worked with.
Solaris zones are awful, and a good example of where Linux is far superior to Solaris. The creators of Zones seemed to have user-mode-Linux as their model, and it shares most of the annoyances of that too. It's not virtualization, and it's not a jail - it's a middle ground which is good for neither. Agree with you to some extent on stability - I've seen Solaris boxes with a load of 300+ still up and running although…
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SystemTap (the kernel probing tool build into Linux) is coming along pretty well - I needed to create something to alert me when arbitrary apps set TCP_NODELAY last week, spend a little while looking at SystemTap, made a simple script that probes at tcp.setsockopt(), got the info I needed, and printed it presentably. I added the script to http://sourceware.org/systemtap/wiki/WarStories . Check it out and others, it's…
SystemTap is great for general system issues, but isn't nearly as good when trying to look at issues that occur inside the JVM.
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I'd add SMF (unless you know about something similar that's built-in into Linux ?).
What does that get me over Upstart or the other event-driven init systems? (This is a question of genuine curiosity. SMF has led to many headaches when I've had to deal with it, simply because it didn't seem to comply with normal conventions like returning nonzero for failure or actually printing what goes wrong to the console .) EDIT: add trailing parenthesis.
Just kidding.