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 AIX v5.3 Difference b/w Flash Copy and Volume Copy? | |
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#1
July 10th, 2008
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Hello Friends I recently configured IBM disk system DS4700 with P570 machine. DS4700 has following features: 1. flash copy 2. volume copy 3. enhanced remote mirroring I am little confused about first two. Can any one please explain in details what is difference b/w two and when we should prefer flash copy over volume copy and vice versa. Thanks for your time and help.          |
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#2
July 11th, 2008
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Flash copy makes a copy of a volume in use at a point in time. On A DS4000 series the Flash copy is maintained as a delta from the original volume, and as such cannot be used independently of the origibal copy. A Volume copy makes a bit wise copy of an existing volume and should be done as an offline action. This is a complete copy of teh volume and can then be used independently. In general you would make a flash copy to get a point in time image of an existing volume and then use Volume Copy to get a complete copy with all data. See http://www-03.ibm.com/systems/storag...hite-paper.pdf for more details.
__________________ Ross Mather, IBM AIX IT Specialist. That said anything I say here is my own opinion and not anything that you can ever hold against IBM. Ohhh and don't forget that I make mistakes too.... |
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