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

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RHEL : Examining Red Hat Linux kernel state using Sysrq key combinations

The internal state of a kernel based on Unix can provide valuable information on current system state. If a user process, or the kernel, is hanging, then the more information that can be gathered at that point, the greater the chance of a good diagnosis. Under...

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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...

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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....

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