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I'd say "yes" as something has to be used to map and zone the disks. I did a course on an IBM DS8000 SHARK SAN a long time ago and it had a couple of RS6000 H70 nodes running AIX which handled the storage. This allowed for live maintenance, the SAN would run with one node while the other was repaired/patched/whatever.
The host systems just see the disks they're configured to see.
Nope! 'Fraid not as that's quite a tall order. I don't know all the OS's that exist out there just as I don't know all the SAN vendors. You might get some sort of answer by Googling something a lot more specific.
I believe most modern cars have about seven computers but again, I wouldn't know what operating system they would be using though I'd suspect some sort of embedded Linux. Does Ford use a different OS from GM or Toyota? No idea.
What's used in a Playstation? Is it different from a Nintendo Wii? Do Sony, Samsung, LG, etc, use the same OS in their televisions and set-top boxes? Probably an embedded Linux variation, again, no idea.
You're asking a VERY big general question, I've no idea where you'd find the answers all in one place.
On the lighter side... I also read that 95% of the ATMs in the US are still running Windows XP which is possibly a bit concerning with XP going EOL in a few days. (OK, OK, so they're on very secure private networks, It was just a nice piece of info.)
I really don't know but the larger SANs from EMC2, HP, Hitachi, IBM, Sun/Oracle, etc, will probably be some form of Unix/Linux running from a hard drive loaded OS (Linux, AIX, Solaris, etc,)I'd reckon using x86, Sparc, PowerPC processors, whatever. Smaller NAS devices and similar bits of kit I'd say run the firmware embedded Linux style OS, probably ARM or x86 processors?
You'll have gathered I'm guessing now. I had a quick look at the HP 3Par storage system which appears to have some sort of proprietary OS, For the .pdf concepts file see: