ASM Volumes ISCSI thin-set in service in volumes of dirty

Hi, we have some EBS test case is going and that you are testing auto-prolonger (into reasonable pieces) on an ISCSI volume thin-set in service to the layer of database 11g. Something does not seem right however: in general I see about 55 GB used by data files, but about 95 percent of the thin-set volume in service is marked modified.

Obviously, this sort of deny the utility of thin provisioning at all, but I can't help thinking that there is something else at work here. Does anyone have any experience with this situation and if so what settings can be defined to do what we try to do a work really right?

ASM is designed to put a wrapper around raw devices leaving (Oracle DBWR, process server) software to read/write directly from a crude into pieces drive "to THE" (AUs being 1 MB by default), rather than "block pieces. For me, the best way to understand it is: the process that wants to work with the disk request ASM where au.

To do this, ASM itself will have to 'index', the location of each AU and blocking is involved. Which, in turn, would require ASM analyze the whole score to determine locations, which might as well mark the blocks as 'reserved '.

If my conjecture is true (and seems to be based on "Oracle automatic storage management: under the hood & practice Deployment Guide" (http://www.amazon.ca/Oracle-Automatic-Storage-Management-Under/dp/0071496076) as well as another reading and supported by your conclusion), then it is not a surprise that the entire volume is assigned and be considered dirty.

Tags: Database

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