Solaris Volume Manager (SVM) : Growing mirrored metadevices online Solaris Volume Manager (SVM) : Growing concat metadevice In the example below, we have a 3 column RAID5 metadevice d10 [ size - 1GB ] with 3 disks - c5t23d0s1, c5t24d0s1, c5t25d0s1. The high level steps to grow the RAID 5 metadevice d10 are : 1. Attaching a new disk to the RAID 5 metadevice as a concatenated device. 2. Growing the file system online. Once we have done growing the RAID 5 metadevice, we would still have a … [Read more...] about Solaris Volume Manager (SVM) : Growing RAID 5 metadevices online
Archives for March 2014
Solaris Volume Manager (SVM) : Growing mirrored metadevices online
Solaris Volume Manager (SVM) : Growing RAID 5 metadevices online Solaris Volume Manager (SVM) : Growing concat metadevice The example shown below uses metadevice d3, which is a 33Gb mirror with a mounted file system. The high level steps to grow the mirrored metadevice d3 includes : 1. Attaching 2 more sub-mirrors (bigger ones - d32 and d33) to the parent metadevice d3. 2. Detaching the older sub-mirrors d30 and d31 after sync. 3. Growing the parent metadevice d3 to reflect new size. 4. … [Read more...] about Solaris Volume Manager (SVM) : Growing mirrored metadevices online
Troubleshooting Oracle Solaris Zones (containers) installation issues
Below are some troubleshooting tips when the command # zoneadm -z install fails to install the non-global zone. Verify the configuration before install Make sure the configuration of the zone is correct using the verify sub-command. global # zonecfg -z zone01 zonecfg:zone01> verify zonecfg:zone01> ---- No error should be reported here. Verify proper privileges Check the user is superuser or has "Zone Management" profile. global # id … [Read more...] about Troubleshooting Oracle Solaris Zones (containers) installation issues
The ultimate Solaris zones (containers) interview questions
Basics Whats the difference between a whole root zone and a sparse root zone ? Whole root zone - Gets its own writable copy of all file systems. Thus installation takes longer time than the sparse root zone. - Also called as big zone. - Bigger disk footprint, thus consumes more disk space - To create a Whole root zone we use the option -b with create sub-command : # zonecfg -z zone01 zonecfg:zone01> create -b Sparse root zone - critical file systems like /usr, /lib, /etc, … [Read more...] about The ultimate Solaris zones (containers) interview questions
The ultimate Solaris networking interview questions
Basics What are the files required for a persistent IP address configuration ? To be able to have a persistent IP address configuration across reboots, make sure you edited the mentioned file below : /etc/hostname.[interface] -- Add IP address/hostname for interface /etc/netmasks -- add netmasks for the networks being used to configure IP address /etc/hosts -- Add IP address and hostname How to check the routing table ? To list all the routing table entries : # … [Read more...] about The ultimate Solaris networking interview questions
The ultimate Veritas Cluster Server (VCS) interview questions
Basics What are the different service group types ? Service groups can be one of the 3 type : 1. Failover - Service group runs on one system at a time. 2. Parallel - Service group runs on multiple systems simultaneously. 3. Hybrid - Used in replicated data clusters (disaster recovery setups). SG behaves as Failover within the local cluster and Parallel for the remote cluster. Where is the VCS main configuration file located ? The main.cf file contains the configuration of the entire … [Read more...] about The ultimate Veritas Cluster Server (VCS) interview questions
How to find Number of Physical/Logical CPUs, cores and memory in Solaris
Sometimes it becomes a bit tricky to gather CPU and memory information, especially with t-series hardware with LDOMs installed on it. The article takes an example of T5240 server to gather hardware information like physical/logical CPUs and memory. T5240 that I use, have the following specs : CPU typePhysical CPUsVirtual/logical CPUs (threads)Memory UltraSPARC T2 Plus212864 GB Gathering CPU related information Finding physical/logical CPUs To find the number of physical CPUs on any … [Read more...] about How to find Number of Physical/Logical CPUs, cores and memory in Solaris
How to dynamically replace CPU/memory board (dynamic reconfiguration) on SunFire s6800/e12K/e15K/e25K
Whats a dynamic reconfiguration? On s6800/e12K/e15K/e25K systems we may dynamically reconfigure CPU/memory boards, I/O boards and PCI on I/O boards with dynamic reconfiguration. The process is on-line and there is no interruption in the OS during this reconfiguration. This is useful when you want to replace a faulty system board on the system or configuring a system board from one domain to another domain. Prerequisites Before starting to remove the system board we have to make sure that … [Read more...] about How to dynamically replace CPU/memory board (dynamic reconfiguration) on SunFire s6800/e12K/e15K/e25K
How to enable/disable SELinux Modes in RHEL/CentOS
SELinux modes SELinux gives that extra layer of security to the resources in the system. It provides the MAC (mandatory access control) as contrary to the DAC (Discretionary access control). Before we dive into setting the SELinux modes, let us see what are the different SELinux modes of operation and how do they work. SELinux can operate in any of the 3 modes : 1. Enforced : Actions contrary to the policy are blocked and a corresponding event is logged in the audit log. 2. Permissive : … [Read more...] about How to enable/disable SELinux Modes in RHEL/CentOS
How to identify the HBA cards/ports and WWN in Solaris
A system administrator must know some of the basic concepts of storage systems. In this post I will try to explain some of the concepts and useful commands related to identifying HBA cards, WWN numbers and fiber channel paths. Before we start with the commands let us get acquainted with some of the storage related terms. Initiator : Initiator is typically a server with HBA card installed. The initiator initiates the connection over the fiber channel to the storage system. Target : … [Read more...] about How to identify the HBA cards/ports and WWN in Solaris