Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base

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Solaris Troubleshooting : Interpreting SCSI Errors from /var/adm/messages

While handling storage related issues, it is important to Unix Admin to take the decision about disk drive replacement.  The interpretation and understanding of the cause of SCSI message blocks is one important part that influences the drive replacement decision.   This article will help you...

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VCS 6.1 : How to manage SCSI-3 disk registrations and reservations for I/O fencing using vxfenadm and vxfenclearpre?

  vxfenadm: The vxfenadm utility enables the vxfen driver to manage SCSI-3 registrations and reservations on disks for purposes of I/O fencing. In the event of a split-brain condition, I/O fencing allows only a system with a valid registration to write to a disk. Thus, I/O...

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Linux Admin Reference – Understand Device Mapper and DM-Multipath – Red Hat Enterprise Linux

Device-mapper is a very important component of Linux 2.6 kernel. It is used for many critical storage related applications, such as LVM2, Linux native multipath tool device-mapper-multipath, device-mapper software RAID, etc. A solid understanding of device-mapper helps system administrators to investigate various kinds of issues with...

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Linux regular expressions ( regex) to analyze text

Create a Sample file to Understand how RegEx commands works in Linux My original text Another line with the number 3 Search for the word “me” I contain 5and6 Skip me and me 0 + 1 = 1 Above this line is a math equation…duh! 1....

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DevOps Series – Automation with puppet – Part7

Puppet Hardware Requirements Puppet client is very lightweight and can be installed on most systems. Puppet server, on the other hand, is heavyweight and has restrictions on the hardware on which it can run effectively. The minimum requirement as of this writing is a dual-core processor...

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