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тАО07-12-2010 03:59 AM
тАО07-12-2010 03:59 AM
Snapshot & Cloning
I am new to HP-EVA and would like to understand the Snapshot mechanism in EVA.
Also does EVA have support for cloning? Any pointers on the above 2 topics wld be great...
Regards
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тАО07-12-2010 05:52 AM
тАО07-12-2010 05:52 AM
Re: Snapshot & Cloning
There is an option called CA (continuous access) that replicates data between two EVAs that may be what you're after.
How to assign points on this new forum? Click the Kudos Star!
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тАО07-12-2010 07:15 AM
тАО07-12-2010 07:15 AM
Re: Snapshot & Cloning
A snapclone starts as a fully-allocated snapshot, but the EVA automatically copies all data from the source volume, even if some blocks have not modified by the host. If the copy is done, the snapclone is converted into a new 'original' virtual disk and all links to the former source virtual disk are cut.
There is also a 'mirror-clone'. Think of it as two virtual disks that are kept identical during normal operation. It is possible to suspend mirroring. The host keeps writing on one of them and the other can be presented to a different host.
They are still linked through a bitmap that tracks which blocks have been modified on either side.
Later, it is possible to 'synchronize' them back. The bitmap helps to optimize this and only resolve the differences.
Finally, you can remove the link and end up with two independent virtual disks.
All these features are covered by a Business Copy (BC) license.
The data replication feature (CA) works a bit like a mirror-clone, except that the second virtual disk is on a different EVA. There is no bitmap, but a full journal if the replication is suspended and some other features from a mirror-clone (e.g. rollbacks) are nor available.
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тАО07-13-2010 05:40 AM
тАО07-13-2010 05:40 AM
Re: Snapshot & Cloning
Is there any limitation on number of snapshots per volume.....if yes is there a way to come around it??
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тАО07-13-2010 10:03 AM
тАО07-13-2010 10:03 AM