RE: Some ASM questions
- From: "Christian Antognini" <Christian.Antognini@xxxxxxxxxxxx>
- To: <zimsbait@xxxxxxxxx>
- Date: Thu, 21 Oct 2004 20:43:03 +0200
Hi=20
>- How is extent management handled in ASM databases? I believe the ASM
>instance maps the physical drive and extents, but does this take
>extent management sizing away from the dba? All the ASM online and
>book examples I am finding are pretty generic with regards to the meat
>of creating tablespaces/objects inside the ASM diskgroups. I assume it
>is all local segment and space managed.
>- How would extent/object sizing conversions to ASM (adding ASM to an
>existing instance or export/import to a new ASM) be handled?
From a database point of view there's no difference with the storage =
options.
Only the file names are different. Of course you would probably use =
OMF...=20
>- How does ASM handle blocksizes? I haven't seen an example where
>someone tries to use different blocksizes inside an ASM diskgroup. I
>suppose it becomes irrelevant when using raw devices.
Yes, no problem at all.=20
>- Are there any quirks using the external redundancy clause? I
>wouldn't think so, but I wonder how Oracle would "rebalance" inside
>the diskgroup with external redundancy.. or is rebalancing "off" when
>external redundancy is specified, since some volume managers give
>sysadmins the ability to find/move hot disks?
Rebalancing always work. This is independent from the redundancy.=20
Chris
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