CentOS/RHEL 6

When to use rescan-scsi-bus.sh -i (LIP flag) in CentOS/RHEL
The “rescan-scsi-bus.sh” can be used to scan new LUNs in a CentOS/RHEL machine. When 'rescan-scsi-bus.sh -i' is run, script execute as well a LIP_RESE...
CentOS/RHEL Unmounting a Windows Share Fails - “device is busy”
The Problem Unable to unmount a Windows share mount point using umount command. This Windows share is not being used by any processes recently. When e...
How to activate a “SUSPENDED” LVM physical volume
When suspending a device using the command dmsetup suspend, any I/O that has already been mapped by the device but has not yet completed will be flush...
Downgrading an rpm package to a lower version (using “rpm” command)
Question: How to downgrade an rpm package in CentOS/RHEL 6 system to a lower version using the “rpm” command? Its not really recommended to use rpm co...
CentOS/RHEL - How to Remove stale ISCSI Target Node Information from ISCSI Initiator Server
The Problem Stale ISCSI target connections which are still present on Initiator node can lead to various issues like: 1. hung iscsid service which can...
CentOS/RHEL 6 Kernel Panic - “Out of memory” kernel parameter panic_on_oom is enabled
The Problem CentOS/RHEL 6 system reboot due too out of memory error: DUMPFILE: vmcore [PARTIAL DUMP] CPUS: 2 DATE: Mon Feb 29 05:28:02 2016 UPTIME: 3...
How to enable core dump for Applications on CentOS/RHEL
1. In CentOS/RHEL core file creation is disabled by default. To enable it, executing the below command: # ulimit -S -c unlimited > /dev/null 2>&1 th...
How to add additional language support in CentOS/RHEL
Question: How to add additional language support in CentOS/RHEL? To add specific language support in CentOS/RHEL, you need firstly confirm the correct...
lvremove failing to remove volume after using 'shred' command
The Problem When trying to delete volume group by using lvremove, vgremove, pvremove command after executing shred command for physical volume as show...