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2010년 10월 22일 금요일

Morning Question_4

What is Distributed locking ?

  • Shared Storage에 접속된 여러 vm들을 관리하기 위한 방법으로 Master 만이 쓰고 읽을 수 있고 나머지 slaves는 읽기만 가능한 방법

Which member of the pool handles the distrubted locking ?

  • Master vm

How many master servers can we have in a pool ?

  • Only 1.

How many secondary servers ?

  • 15

WHen will a secondary automaticially become a master ?

  • when master server cannot be recovered.

What does Intel Felxmigration or AMD Extended Mirgation allow us to do in a hetrogenus pool ?

  • Intel과 AMD 사의 다른 CPU를 가지고도 Zen Motion을 할 수 있음. (live migration)

Why is NTP time syncronisation important to all the members of a pool ?

  • cus they use XML-RPC protocol to communicate with?

What happens to a VM if it has a local (internal only network) and you try to migrate it ?

  • Doesn't it depend on physical server's network? 

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