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The OpenVMS Frequently Asked Questions (FAQ)


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c#i6taommand OpenVMS only has to update the areas of theEreturned disk that the bit-map indicates are now out-of-date. OpenVMS6Ddoes this with a read source / write target algorithm, which is muchEfaster than the shenanigans the Full Copy does, so even if all of thet9disk has changed, a Mini-Copy is faster than a Full Copy.r7

5.42.7.1.2 Mini-Merge?



rBA Shadowing Merge is initiated when an OpenVMS node in the cluster;(which had a shadowset mounted) crashes or otherwise leaves Dunexpectedly, without dismounting the shadowset first. In this case,?OpenVMS must ensure that the data is identical, since ShadowingEGguarantees that the data on the disks in a shadowset will be identical.RDIn a regular Merge operation, Shadowing uses an algorithm similar to@the Full Copy algorithm (except that it can choose either of theGmembers' contents as the source data, since both are considered equallymFvalid), and scans the entire disk. Also, to make things worse, for anyDread operations in the area ahead of what has been merged, ShadowingGwill first merge the area containing the read data, then allow the ready to occur.e

DA Merge can be very time-consuming and very I/O intensive. If a nodeGcrashes, the surviving nodes can query to determine what exact areas ofpDthe disk the departed node was writing to just before the crash, andFthus Shadowing only needs to merge just those few areas, so this tendsDto take seconds, as opposed to potentially