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Cold standby,Warm standby & Hot standby solutions Expand / Collapse
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ravisamigo
Posted Thursday, February 17, 2011 4:45 AM
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Dear All,

Can someone clear out my doubts here?please

What is the meaning of Cold standby,Warm standby & Hot standby solutions ?

NOTE:Please provide me the examples for each of one.


Thanks in advance.

Regards,
Ravi.
Post #1065553
Oliiii
Posted Thursday, February 17, 2011 6:36 AM


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Hot standby is a server that will automaticaly failover if the primary server fails. You can get this using synchronous mirroring + witness (not sure if a cluster can be called a hot standby).
Warm standby is a server that will not automaticaly failover and that may not have all the latest transactions. You can get it by using log shipping or asynch mirroring.
Cold standby is just a spare machine that needs to be turned on, backup restored (or even full staging of the machine).
Post #1065614
ravisamigo
Posted Thursday, February 17, 2011 11:29 PM
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Thanks for you reply !!


Regards,
Ravichandra.
Post #1066155
MysteryJimbo
Posted Friday, February 18, 2011 2:51 AM
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Oliiii (2/17/2011)
Hot standby is a server that will automaticaly failover if the primary server fails. You can get this using synchronous mirroring + witness (not sure if a cluster can be called a hot standby).
Warm standby is a server that will not automaticaly failover and that may not have all the latest transactions. You can get it by using log shipping or asynch mirroring.
Cold standby is just a spare machine that needs to be turned on, backup restored (or even full staging of the machine).


I would call a cluster a "hot standby". Anything high availability model which "should" require no intervention in the event of failure would a hot standby.

Mirroring with a witness is a hot standyby. Mirroring without a witness is a warm standby.
Post #1066223
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