Solaris

Hi, not really a Solaris user, so a little out of my depth, but we have a relatively old Ultra10 server running Solaris and it has been running well for years. However recently it seems to "lock up" on occasion, more so now than before, and needs a reboot to get it back to normal. This is only temporary however as it does not take long for it to freeze up again (sometimes even a couple of hours) so not sure what to do. It's not running anything heavy, just one application in fact, a management system for a telecoms system.
Any ideas on what I should check? Does the memory or something get full after a while or even perhaps the disk or what? Not sure what to look for.

But, since it has been running ok for a long time and now more prone to problems, I am going to first guess disk space issues. Especially if no one has been monitoring the system; temporary and permanent workspace could be full.
Can you do a

Code:

df

command?

You should also have a look for any error messages

Code:

dmesg

See what that shows. You can also look at /var/adm/messages
I'm guessing you are not familiar with vi so to check this file without using vi or even better view you can use tail and then specify how many lines you want to display.
To check the last 50 messages in that file you would type:

Code:

tail -50 /var/adm/messages

If you want to give vi / view a go try this:

Code:

view /var/adm/messages

Then in the screen that shows up, go to the end of the file by pressing G ie: <shift> g , to go up a page at a time press <Control> u to go down <Control> d
To exit view type:

Code:

:q!