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

7

Solaris Live Upgrade – Known Issues that frequently fails the Live Upgrade

      While troubleshooting some of the Live upgrade issues in my test environment, I have come across some important list of known issues which causes the Live Upgrade to fail. Even in the past, I have noticed that many Solaris folks complained about the...

6

Unable to get EMC storage Lun's visible under veritas control in Linux.

  I was performing Storage migrations for Linux RHEL 5.x and 6.x having VXVM. Storage have provided the Lun’s and confirmed all is okay from their end. But I was unable to get them visible on Veritas level though the same were visible at OS level....

8

Virtual Lab : Get Your hands dirty with grep & RegEx

Regular expressions are extremely useful in extracting information from text such as code, log files, spreadsheets, or even documents. As an unix administrator we do regularly use the regex to perform various problem diagnosis , automation or remediation tasks. And it is almost impossible to imagine...

8

RHEL 6 – ISCSI Administration Series – ISCSI Lun resize

This is second post from the ISCSI administration series ( you can refer the first post here RHEL 6 – ISCSI Administration Series – Configuring ISCSI Server and Client ) . In this post, I will be showing you an hands-on exercise to expand a ISCSI LUN which is already...

9

VxVM Troubleshooting – Increasing the Size of Veritas Disk Private Region

    We know that each disk under veritas volume manager  is having some  identification information in it’s private region, so that the disks are readily identifiable irrespective of the machine they are connected.  When we place these disks under Veritas Diskgroups, the VxVM will start writing...

21

VCS Learning – I/O Fencing In action [ Video ]

This post is all about the purpose of I/O fencing and how i/o fencing works to avoid the split brain condition?. Normally, I do spend  4 to 6 hours to post a technical article  with complete details, but for this one I have spent lot more...

17

VCS Learning : Learn about Cluster Hearbeats

Cluster heartbeat connections are important components of VCS cluster, to allow cluster to work as expected for fail over and failback operations. In this post i will be showing to some basic verification that helps unix admins to confirm the health status of the cluster heartbeats.   Once we have the...

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