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Category: LVM

Physical Volume In AIX – A Primer

Posted on March 27, 2009 by Ganesh Sharma

Physical Volume in AIX is a hard drive with special characteristics which are useful for LVM(Logical Volume Control). So, if any hard drive is to be used for LVM purpose, it needs to be made as Physical Volume. Physical Volume has several properties which differentiate it from normal hard drive. These are listed as below…

Non Concurrent, Concurrent and Enhanced Concurrent Volume Groups

Posted on January 2, 2009 by Ganesh Sharma

Often the confusion arises among these types. I am trying to clarify the differences.The terms often apply in clustering scenario.

Non Concurrent VG
In Non Concurrent VG, application runs typically on a single node only and data of VG is accessible to that node only. If however present…

Quorum-What it is and Why is it Needed

Posted on January 1, 2009 by Ganesh Sharma

The importance of Quorum concept lies in fact that if quorum is enabled and VGDAs fall below 51% then the data on VG may be corrupted if VG remains varied on. Thats why quorum enabled VG is varied off if quorum falls below 51%. This way data is safe on VG because disk

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