There are a bunch of runlevel for UNIX or Linux which is also called init level or mode of operation. Usually there are seven init or runlevels (0 to 6). Only one runlevel can be running at a single time.

New task at hand fellow UNIX Administrators. Now we need to discover the new (EMC) LUNs presented by the Storage team and make it available into Veritas Volume Manager (VxVM) and extend one of the filesystem under Veritas Filesystem (VxFS).

If ever you encounter a console with output such as below, it can be easily be remedied by fixing the /etc/ttydefs file.

The last time we discussed on how to access the HP iLO. But we need CLI commands for us to be able to further troubleshoot our hardware. Just like we did for Sun / Oracle ALOM – here are the commands that one can use for HP iLO.

There are times that we need to do maintenance on a system and we need to connect to its hardware or system controller. With HP boxes they are called HP Integrated Lights-Out (iLO).

As UNIX Systems Administrators, we want our systems up and running – 24 hours a day, 7 days a week. Though this could be achievable with the UNIX Operating Systems, we cannot set aside the fact that our hardware equipments is prone to wear and tear. One notable point of failure if our root or boot disks. Once it dies out – our only way is thru our backup and restore it. But there is another way that we could prevent this – if we have a spare identical disk as our root disk. We can have a redundant machine by having our root disks mirrored and make our system much reliable and omit this point of failure. Here are the step-by-step how to guide in mirroring our root/boot disk using the Solaris Volume Manager (SVM).

If in case you are new to our site, Welcome to UNIX Note! The month of May has passed and lots of How-To guides and some UNIX, AIX, Solaris Tips have been shared. Here is a quick round up of the Tips and Tricks as well as How-To guides that you might have missed:

Our server had panic and don’t have any space left on you /var partition, worry no more, there is still a way to generate the core files with the help of savecore and make Sun Support don’t wait for another panic to happen before they get their core files.

We had a hardware failure and we cannot seem to boot to our system. Our only option is to restore from our backup. The good thing is that we have foreseen this incident and took the liberty to have a backup of our OS. We will now use ufsrestore to bring our server up and running.

As a good old saying says – An Apple a Day keeps the Doctor away – is also applicable on having good OS backup that will always keep headaches lesser when the hard times come. Now comes ufsdump, a usefull command to help us backup our Solaris Operating System.