Posted on 2011-04-28
Last Modified: 2012-06-21
Hello Experts,

I have DL360 G4 and G3 machines. I usualy do backup by rebooting and switching one of the drives and then press F2. Is it allowed to just take out DISK when server is runnign and insert another one so I have real time backup [hot backup] ?

Question by:fpoyavo
    LVL 11

    Expert Comment

    Why plug-out drives for backup??
    LVL 55

    Accepted Solution

    They're using the manual method described in

    It's not recommended to use the split mirror method for normal backups, there should be a proper backup procedure in place. Breaking the mirror this way relies on the data on both drives being good, should there be a bad block on one disk that background parity hasn't repaired you're left with a dead system; it's more of an emergency process that you do when there isn't time for regular backup.

    Even the ACU based method is done offline, the manual method must be performed offline because data in cache is not written to the drive immediately so the copy on the disk that is pulled out would be in a state that's even worse than the state of the data when you yank the power plug on a running server. The OS buffers have to be flushed to disk as does the controller's cache, yanking a disk out does not achieve either.

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