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Archives for October 2014

The Ultimate LDOMs troubleshooting guide

by admin

Most of the LDOM issues can be easily resolved by looking at the error message. Below are some of the most commonly faced LDOM issues and basic troubleshooting tips to resolve them. 1. Unable to create LDom 2. Unable to install LDom 3. Unable to configure LDom 4. Unable to bind LDom 5. Unable to […]

Filed Under: LDOMs Tagged With: ldom, ldom troubleshooting

Beginner’s Guide to LVM (Logical Volume Management)

by admin

What is LVM Logical volume manager (LVM) introduces an extra layer between the physical disks and the file system allowing file systems to be : – resized and moved easily and online without requiring a system-wide outage. – Using discontinuous space on disk – meaningful names to volumes, rather than the usual cryptic device names. […]

Filed Under: CentOS/RHEL 6, CentOS/RHEL 7, Linux Tagged With: beginners guides, centos, lvm, rhel

How to change the ASM rebalance power of an ongoing operation

by admin

ASM rebalance Power Whenever there is a disk added/removed/resized, ASM starts to rebalance the data on the disks in the disk group. The power with which it does the rebalancing is the rebalancing power. The rebalance power defaults to the value of the ASM_POWER_LIMIT initialization parameter (default value = 1). The higher the limit, the […]

Filed Under: ASM, oracle Tagged With: asm, oracle, rebalance power

SVM : How to un-encapsulate root disk (SPARC)

by admin

There may be times when you want to boot from the unencapsulated SVM root disk by detaching one submirror. The term unencapsulation refers to a method of taking disk out of SVM control while retaining its content. The reason to do this can be many – For patching or when the system is not bootable […]

Filed Under: SVM Tagged With: encapsulate root disk, SVM

Beginners guide to Device Mapper (DM) multipathing

by admin

Multipathing Overview A path is a connection between a server and the underlying storage. The path can be severed due to many reasons like faulty HBA, faulty cable etc. To avoid such single point of failures, multipathing exists. Multipathing ensures that the system uses multiple physical paths to provide redundancy and increased throughput. There are […]

Filed Under: CentOS/RHEL 6, CentOS/RHEL 7, Linux Tagged With: device mapper multipathing, linux

CentOS / RedHat : Beginners guide to log file administration

by admin

The system log daemon is responsible for logging the system messages generated by applications or kernel. The system log daemon also supports the remote logging. The messages are differentiated by facility and priority. In principle, the logs handled by syslog are available in the /var/log/ directory on Linux system : # ls /var/log acpid cron.1 […]

Filed Under: Linux Tagged With: linux, log file administration, log rotate

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