Working with configuration files
Not many people knows about the HP-UX tool ch_rc. This is a command line tool for people who are not so familiar with sed (stream editor), awk and pattern matching. SYNOPSIS /usr/sbin/ch_rc -a|-r|-l...
View ArticleInterrupting the boot process
If you’ve suspected something in the boot process and don’t want to continue with it, or it just seems to hang, you can press CTRL + / and it just stops and will give you a login prompt. I already...
View ArticleHP-UX Tunable Maintenance Mode
Hopefully everybody knows about the low quorum boot option, by which one is able to boot the system with a defective boot mirror. Now I will show you another boot option. The tunable maintenance mode...
View ArticleHP-UX: VxFS data integrity concern with write (2) system call
This is from a recent HP-UX Customer Bulletin, Document ID: c02678348: The HP systems that use any version of VxFS file-system on HP-UX 11iv1, HP-UX 11iv2 and HP-UX 11iv3 operating systems and perform...
View ArticleCheatsheet: EMC Powerpath on HP-UX
The latest 11.31 HP-UX version uses native multipathing with the help of the new IO stack. However if you’re on an older version, it was common along many customers to get a Powerpath license from EMC....
View ArticleFind out the disk we were booted from – Itanium version
This is an advanced method to determine which disks we were booted from. I already posted a solution here, but it turned out to work only for PA-RISC systems. If you are on Itanium, it is more...
View ArticleCrash dump analysis with crashinfo
If the system becomes uncontrollable, the last resort is to push the TOC button or run the TC command from the GSP. This will cause the system to generate a crash dump under /var/adm/crash. By...
View ArticleAdd a custom screensaver to CDE
The Common Desktop Environment (CDE) has many screensavers for use, you can select which you like the most from the Style Manager Screen menu. There is the screen saver action definition, which...
View ArticlePhysical vs. Logical I/O
If you do performance tuning or troubleshooting with glance probably you have observed the terms logical I/O and physical I/O. This post is to clarify these shortly: Physical I/O: the traffic toward...
View ArticleChecking the status of multipathing in 11iv3
A common task in a sysadmin’s life is to assist to the changes which are affecting the SAN network. At smaller organizations it could be that besides the system administrator role you also need to...
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