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How does the instant backup work if the data needs to be sent to the vSnap server?

  • 1.  How does the instant backup work if the data needs to be sent to the vSnap server?

    Posted Thu September 13, 2018 05:30 PM
    How does the instant backup work if the data needs to be sent to the vSnap server? I mean, for example, SVC snapshot is really instant.

    Thanks,

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    milan hrivnak
    IBM
    Brno
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  • 2.  RE: How does the instant backup work if the data needs to be sent to the vSnap server?

    Posted Fri September 14, 2018 04:44 AM
    The process is something along the lines of:

    • SPP server instructs the Hypervisor to quiesce the VM to be backed up
    • The hypervisor takes a snapshot of the VM (disk writes are re-directed to a temporary virtual disk file by the hypervisor)
    • The Snapshot is transferred to the vSNAP
    • Any changes during the backup operation are merged back into the virtual disk files (this is handled by the hypervisor)
    Essentially as soon as the quiesce/snapshot has happened, the backup has taken place, normal VM operations resume. This should take in the region of a couple of seconds, depending on the environment and exactly what's going on with the VM at the time.

    In the case of instant restore:
    • SPP restores the VM definition
    • vSNAP hosted virtual disks are mounted on the hypervisor
    • VM is started
    • Virtaul disks are VMotioned / Storage Migrated over to the hypervisor while the VM is running
    • vSNAP is unmounted
    • Recovery is complete

    I hope this helps.

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    Fraser MacIntosh
    Spectrum Software Competitive Analyst
    IBM
    Hursley
    07747633322
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    Original Message