Some ASM questions
- From: z b <zimsbait@xxxxxxxxx>
- To: Oracle List <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 21 Oct 2004 12:53:37 -0400
Hello Listers,
I am doing a bit of research on ASM and its benfits and drawbacks and was
wondering if anyone else has been playing around with ASM. I'd love to have
a sandbox to play around and test all these things, but I don't have
one available.
I'm curious to know:
- 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?
- 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.
- 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?
If anyone can lend some insight, I would appreciate it.
//
JK
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