SunOS to Solaris versioning explained [updated]
What surprises me, even today is how many times I get asked the same question ...
What's the difference between SunOS and Solaris?
I quote the same answer everytime...
SunOS is the core operating system comprising the kernel, utilities and basic libraries. Whereas, Solaris is the broader environment comprising SunOS, a Graphical Desktop, Applications and Networking support. In a nutshell you could say that SunOS is a component of Solaris.
Matching Solaris to SunOS
SunOS and Solaris relate to each other as follows:
|SunOS 4.1.1B||Solaris 1.0|
|SunOS 5.0||Solaris 2.0|
|SunOS 5.4||Solaris 2.4|
|SunOS 5.5||Solaris 2.5|
|SunOS 5.5.1||Solaris 2.5.1|
|SunOS 5.6||Solaris 2.6|
|SunOS 5.7||Solaris 7|
|SunOS 5.8||Solaris 8|
|SunOS 5.9||Solaris 9|
|SunOS 5.10||Solaris 10|
|SunOS 5.11||Solaris 11|
If you want a brief history on Solaris 1.0 owards take a look at this wiki pages, but to summarise...
How can we tell if Solaris is running 32-bit or 64-bit OS?
isalist command to determine whether the machine is running the 32-bit or 64-bit operating system. If you are running the 64-bit operating system on an UltraSPARC machine, then
isalist will list sparcv9 first
The following is an example of the isainfo command executed on an UltraSPARC system running the 64-bit operating system:
% isainfo -v 64-bit sparcv9 applications 32-bit sparc applications
-b option prints the number of bits in the address space ( cpu’s bit size capabilities ) of the corresponding native applications environment:
% isainfo -b 64
How to boot in 64-bit or 32-bit mode?
To boot a 32-bit kernel, at the ok prompt type:
ok boot net kernel/unix
To boot a 64-bit kernel (default), at the ok prompt type:
ok boot disk kernel/sparcv9/unix
On Ultra SPARC systems with a CPU speed of 200 MHz or less, the file
/platform/sun4u/boot.conf must have the following line uncommented:
If this line was commented out when the system was booted,
isalist will NOT list
sparcv9 as an option, even if all packages for 64 bit support are installed.