Solaris as a server OS - what are the disadvantages?

I am (was) a Solaris admin through to about nine years ago, from v2.5 through v8. I've had a little exposure to Solaris 9, and almost none to 10.

My reasons for avoiding Solaris:

Hardware support is not nearly as good as many Linux or Windows operating systems. It is improving.

You can run Solaris for free, but you can't get updates for free. Not even security updates. Not even 0-day exploits. You have to buy a support plan, per system, which can be expensive. This means that the way to get updates is to wait for the next "U" release, and upgrade at that point.

OpenSolaris is too bleeding edge for me. It changes too often, and the releases wander too close to unstable or unreliable for my needs.

Between Solaris and OpenSolaris, Sun has managed to totally miss the happy medium between "welcome to 2004" and "I'm so new and shiny I don't really work 100%!"

I used to be willing to use Solaris more before the Blastwave project imploded. Through there I could get newer tools that fit more with the Linux way of doing things (which is where I spend 95% of my professional time) with a relatively easy online way of managing the tools and updates. Once Blastwave and CSW settle down, I'll look at both remnants and decide if it is worth putting time and effort into either of them again. Really, the loss of Blastwave as a trustworthy source of tools was a huge blow to Solaris' viability in my circles.

But the number one reason for me is that right now I don't need to do anything that requires Solaris.

My biggest worry, as a large Oracle customer, is that they'll eventually do away with either Solaris or 'Oracle Enterprise Linux' (their rebadge of RHEL).

Obviously both have their benefits and their downsides but I do know that they're selling a lot more OEL support agreements than Sun were selling for Solaris and of course they own the development costs of Solaris, OEL dev costs then very little at all.

We all love Solaris but if it's not selling well enough and costing too much to develop then I'm sure Oracle will simply 'asset strip' it (keep ZFS etc.) and sell it on to someone else. That would be my main concern.

For 10-15 years, biggest worry has been about the future of Sun and the future of SPARC. I was about ready to give up when they came out with Solaris 10 which leaped ahead in terms of technology (although took ~1 year to be production worthy). The recent Oracle purchase adds a lot of short-term uncertainty but that could go away pretty quickly (regardless of the outcome). SPARC still seems a lost cause, even though there's been a lot of buzz around their "new" CoolThreads processors, but these are too specialized to gain wide acceptance.

It'll be interesting to watch industry trends... Years ago, I observed a lot of Wall Street firms flocking to Linux (from Solaris/sparc) not for Linux, but for x86. When Solaris 10 came out, there was definitely a partial reversal to Solaris, again on x86.

Package and patch management shouldn't be a worry, it's a matter of knowledge/skill. To offer you a different perspective, my new job is in a Linux environment and both package and patch management worry me. These are old generic concerns for which there are answers.

I will miss Solaris sorely, some things in it just can't be found elsewhere.