MaxDB 7.x and its reorganization + SAN cloning/snapshotting

We are currently in the process of evaluating a new storage solution for all our SAP (= MaxDB) systems.
Given the case we'd produce a snapshot from our production system (3,1 TB) and present the results of that to another server to create a test system. Observations turned out that we move between 300 - 600 GB of data daily on the production - not only but also due to the internal MaxDB page reorganization. This would eventually result in a test system that will be as big as the source system in a few days.
We are currently discussing whether and if yes how it can be possible to reduce the amount of daily block changes, I'm of the opinion that this is not really possible.
Am I right?
Markus

> Copy-on-Write in turn is a feature of the physical page management (happening in the converter).
> This does happen with every change of the page - even if it's an in-place operation seen from the logical-page-angle.
Ok - got it.
> > > EnableDataVolumeBalancing YES
> > > Another feature that might lead to a higher amount of 'moved' pages is maybe the table clustering. (I haven't checked this, but I assume this!).
> >
> > Those two come together, no rebalancing on Volumes --> no more free clusters - fragementation - slower system. There are other parameters influencing the "search for free clusters", yes, but eventually this will lead to a slower system.
>
> Nope again.
> Rebalancing surely helps to free up space for clusters, but you can use the clustering without it.
Sure - I did not exclude them
> For the clustered pages a certain area of each data volume is kind of reserved and not considered for non-clustered pages.
I thought this "static" mode is no more supported but now it's "mixed up" (with 7.7.x) with other non-clustered pages.
> > Another discussion was/is the deduplication of backups, we tested this earlier and there is only one solution supporting the MaxDB backup deduplication (Exagrid), others storage vendors are not really aware of MaxDB backups being a "problem" as per todays knowledge. They all think in "Oracle files".
>
> I wouldn't call this 'thinking' really.
> In fact this feature is not that clever and as you see it's also not very flexible.
Well, reducing a daily "full backup" of 3,1 TB to a daily backup of a few hundred GB is clever enough to save time and backup space, no matter how intelligent it is in fact. We are doing this with other (non-SAP) databases (SQL Server) and it works pretty well saving LOTS of storage and tapes.
> As soon as the data 'moves' around it does not work properly anymore.
That's again the reorganization thing, interestingly enough is Exagrid clever enough to detect the changes and stores only one block and not the two (as in COW) - which is a significant reduction.
Backing up a 3 TB database is a challenge if you have no real SAN features to assist you.
Markus

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MaxDB 7.x and its reorganization + SAN cloning/snapshotting

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