One of the most common problem in Redhat Linux is “read only root filesystem” when there is issue with hardware or SAN sub-systems .To fix the “read only filesystem” issue ,you need to reboot the server.But while rebooting the server, you will definitely encounter many issues and that requires a manual intervention by logging in with the […]
Veritas Volume Manager/Cluster License Keys
I Just got a time to write about my all time favourite product “veritas”. This post is all about veritas volume manager and Veritas cluster licensing. These products will be mostly used on Enterprise computing environment and it provides great on-line functionality for managing volumes & filesystems. This product is worth for the money but as a system administrator, we […]
How to Break/Recover Solaris root Password ?
Every organization may have their own way to secure the root passwords for their servers. According to their security polices ,Unix administrators need to change the servers root’s password on routine basis.But sometimes due to human error, there may be chance to loose root password.Unless some of the normal user had sudo root access, you […]
Redhat Linux Certification Path for Linux Administrators
Redhat Linux is emerging in the mid-range server market day by day. So that Linux administrators demand also increased rapidly.There are lot training institutes are conducting Linux training and companies need to filter the quality administrators from the market. So certification is one of the key criteria to filter the right candidates. Redhat certifications are […]
Solaris – How to Scan FC LUNS and SCSI Disks ?
Application’s and Database’s storage requirement on the servers will be keep on increase day by day. According to that, Unix admin need to increase filesystem space on Unix servers periodically. Assigning big SAN space to filesystem also not possible since storage cost involved on that. So it’s a routine work for Unix admin and need […]
Linux – LVM Free Training / Tutorial
In UnixArena Tutorial series, Here we are going to see about Linux’s Logical volume manager which is default volume manage on all of the Linux flavors which are available now a days in market.In this tutorial, you will learn how to integrate, operate, LVM on Redhat Linux. This training provides instruction on operational management procedures […]
Redhat Linux – LVM Volume Attributes
Redhat Linux’s Logical volume Manager has many attributes which are available for controlling the behavior LVM objects or to changing the default values of LVM. We may not use those attributes very often in typical production environment but knowing is not a bad thing. As a Unix/Linux admin,we should have capability to explain each and every field of […]
Linux LVM – How to take volume snapshot
In this LVM tutorial series, LVM snapshot topic is an important one and it’s one of the must know feature of Redhat Linux’s LVM. Volume snapshot is very useful to take database backup in consistent state without shutting down the database.If you take database backup without halting it,then that will be leading to an inconsistent DB […]
Redhat Linux – LVM Volumes Re-layout
In Linux, Logical volume’s layouts need to be changed according to the importance of data and performance of the volume. For example,If the current volume layout is mirrored and that volume’s data doesn’t update very frequently then daily backup may enough for the applications in case of disk failure.In these cases, you may get a […]
Latest OS Patch Bundles for Solaris
I am not happy to post Non-Technical posts on UnixArena. But I felt this post will be helpful for Solaris administrators to find the latest OS patch bundles from Oracle. Customers would like to install latest OS patch bundles to keep their systems update to date.As Unix Admin, we have to provide those patch bundles information to […]