Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base


Oracle Enterprise Linux – Configure Raid

RAID (Redundant Array of Inexpensive Disks) defines the use of multiple hard disks by systems to provide increased diskspace, performance and availability. This article solely focuses on implementing RAID1, commonly referred to as mirror disk, whereby two (or more) disks contain identical content. System availability and...


Solaris Solstice DiskSuite: recover a metadevice that is in an unstable state OR how to recreate metadevice without losing data

When  a metadevice goes into an undefined state,  recovery of metadevice with meta commands is problematic.   The workaround is to re-create the metadevice after carefully recording the current configuration from metastat -p.   The procedure is a bit risky if not followed carefully, so keep the backup handy....


Solaris Volume Manager (SVM) – Adding Mirror to a metadevice housing soft partitions.

To add a mirror to a metadevice with one or more soft partitions can be done with a short amount of downtime, but it’s a bit tricky. The best way to illustrate this procedure is with an example. In the example below, we’ll use the following...


Solaris Troubleshooting NFS : NFS mounts hang, with error ” SERVER NOT RESPONDING “

Hosts remotely mount other hosts, often times via routers, bridges with  straight NFS mounts or with automount.  Sometimes, the  process accessing those remote hosts just hangs forever or gets the message: NFS SERVER <servername> NOT RESPONDING ..sometimes followed by NFS SERVER  <servername> OK


Solaris Troubleshooting : Find Network Interface names that are available but not plumbed

The command ‘ifconfig -a‘ will find system network interfaces that have been configured on boot, but it is difficult to find the interfaces that may be ‘sleeping’ . We normally  trace the name by searching thru dmesg, prtconf, or /etc/path_to_inst


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