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 connect to LDom How to verify if LDom services are started Below are two basic services needs to be running on the Primary domain (aka Control domain) for the ldom to start/work properly. 1. … [Read more...] about The Ultimate LDOMs troubleshooting guide
Archives for October 2014
Beginner’s Guide to LVM (Logical Volume Management)
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. - span multiple physical disks Linux LVM is very similar to HP-UX LVM and provides many other advanced features like snapshots, cluster support (GFS2, OCFS and … [Read more...] about Beginner’s Guide to LVM (Logical Volume Management)
How to change the ASM rebalance power of an ongoing operation
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 faster a rebalance operation may complete. Lower values cause rebalancing to take longer but consume fewer processing and I/O resources. This leaves these … [Read more...] about How to change the ASM rebalance power of an ongoing operation
SVM : How to un-encapsulate root disk (SPARC)
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 when under SVM (this offcourse can not be done in multi-user environment and requires you to boot the system in single user-mode. The procedure remains the same in that case too) The setup where we … [Read more...] about SVM : How to un-encapsulate root disk (SPARC)
Beginners guide to Device Mapper (DM) multipathing
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 many vendor specific multipathing implementations like EMC's powerpath and Symantecs VxDMP. What is Device Mapper multipath Device Mapper … [Read more...] about Beginners guide to Device Mapper (DM) multipathing
CentOS / RedHat : Beginners guide to log file administration
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 maillog.3 rpmpkgs.3 spooler.3 anaconda.log cron.2 maillog.4 rpmpkgs.4 … [Read more...] about CentOS / RedHat : Beginners guide to log file administration