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16 Cards in this Set
- Front
- Back
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What does HA stand for?
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High availability
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What does XenServer do when HA is enabled on the pool?
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Monitors the health of the servers. Uses heartbeats on the network and storage to determine the state of the servers. If a server in the pool failed, VM fails it's automatically restarted on antoher server. If the master fails, a new server takes over as the master
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What are the 4 key requirements for high availability?
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Shared Storage, XenSerer pool, Enough Licensing, Agile VMs
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What makes a VM agile?
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Has it's virtual disks on shared storage. Does not have a connection to a local DVD drive. Has its virtual network interfaces on pool wide networks
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What is the shraed storage requirement for the heartbeat of the HA pool?
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iSCSI or FIbre Channel
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What volumes are created on the heartbeat storage repository?
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4meg heartbeat and a 256meg for meta data
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Why would you have to disable high availability?
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When you are doing anything that would compromise the plan for restarting VMs
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What is a fenced server?
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A server that is immediately resarts, causing VMs to stop. VMs are restarted per settings other server. THis reboot prevents the pool from having the same VM running more than once
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What defines a failure with host fencing?
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Loss of network or a problem with the control stack
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How is metadata backup/restore done?
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Via CLI or textconsole
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What happens on the first meta data backup?
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Special backup of the VDI on a storage repository
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T/F Meta data is used for disaster recovery is sahred between the storage repositories for multiple sites?
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True
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What script backsup meta data?
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xe-backup-metadata
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What script restores meta data?
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xe-restore meta
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What are the two snapshot types?
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Regular snapshots
Queiecsed snapshopts (VSS) |
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Snap shots of storage for VM meta data are done when using what technologies?
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NetApp Filer. Dell EqualLogic storage
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