Category: Blog for Unix Admin

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VXVM : Resolving duplicate disk/device entries in "vxdisk list" or vxdisksetup

Sometimes, when failed fibre channel disks are replaced in arrays or servers under Veritas Volume Manager control, duplicate entries appear in the vxdisk list output. While Veritas indicates in TechNote 236062 that the ultimate solution is a reconfiguration reboot (or two), recycling the host is often...

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Solaris 10 : Service Milestones

They provide a way to group services together. Solaris defines 3 of them (there are others) which roughly relate to the traditional Solaris  runlevels: svc:/milestone/single-user >>> init S svc:/milestone/multi-user >>> init 2 svc:/milestone/multi-user-server >>> init 3 In addition, SMF has two pseudo milestones: none >>> Do...

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Solaris 10 : Configuring Interprocess communication Parameters

Many system administrators, particularly those managing large database servers, have had difficulty tuning shared memory and semaphore parameters in /etc/system. Often, these difficulties are experienced before starting an application instance. The Solaris 10 Operating System addresses this issue by integrating the System V IPC tunables into...

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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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