EMail Posts / Linux Admin / Redhat Enterprise Linux 6 / Redhat Linux Kernel
by Ramdev · Published July 23, 2021
What is the meaning of a Linux System Crash? Â Crash is a generic term used usually to say that the system has come to halt and no progress is observed. The system seems unresponsive or has already rebooted. Kernel Panic – A voluntary halt to...
As part of regular System Admin task we were asked to configure new storage to an existing sybase server without disturbing the existing storage and expecting no downtime for the existing production server. All necessary storage LUNS were already allocated by the Storage team as mentioned...
Solaris Admin / Solaris11 Admin / solaris11-Howto / Unix Intermediate
by Ramdev · Published July 21, 2021
How to Display Information About Files and Disk Space Display information about how disk space is used by using the df command. $ df [directory] [-h] [-t] df     With no options, lists all mounted file systems and their device names, the number of 512-byte...
Below procedure can be used to identify the hard disk errors in linux operating system. Execute the following command to identify the available disk configuration  # /bin/more /proc/scsi/scsi Output will include all the currently available disks to the linux, and the output vary depending on...
Blog for Unix Admin / Solaris Admin / Storage Configs for Unixadmin
by Ramdev · Published July 19, 2021
If Fibre Channel devices are not present or turned off, boot errors will occur. Without corrective action, these errors will persist for every re-boot. The boot errors which are linked to this problem, can be found in the /var/adm/messages file, and are formatted as follows:
1. Grub Configurations GRUB is configured using ‘grub.cfg’, usually located under ‘/boot/grub’. This file is quite flexible, but most users will not need to write the whole thing by hand. 1.1Â Simple configuration handling The program ‘grub2-mkconfig’ generates ‘grub.cfg’ upgrading a distribution, and will discover available...
The sshd daemon that comes with the Solaris 9 & 10 Operating System uses TCP (Transmission Control Protocol) Wrappers (also called “libwrap”) to control access to hosts. (Unlike other systems, Solaris 9 & 10 does not use the OpenSSH keywords “AllowHosts” and “DenyHosts” to permit or...
VCS requires you to set up a private network between the systems that form a cluster. You can use either NICs or aggregated interfaces to set up private network. You can use network switches instead of hubs. However, Sun systems assign the same MAC address to...
Blog for Unix Admin / Network Design / Solaris Networking / Solaris Performance Monitoring
by Ramdev · Published July 15, 2021
Our Unixadmin, John from xyz company,  recently upgraded one of his server’s network interface card from the old one with 100MB speed to a new one with 10Gig speed , and the reason is to improve the speed for the backup of the server. After the NIC Upgrade john found that the server network...
Udev is the mechanism used to create and name the /dev device nodes corresponding to the devices that are added to the system  during the booting. When a device is added or removed from the system, the kernel creates a device name in the /sys psuedo...
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