Re: ASM on Linux with SAN : yes or no ?

Hi Mathias,

We have been running ASM for six months for a 2TB data warehouse on AS
4.0 (Eight CPU) on an EMC DMx without an issue. The rebalancing when
you add disk scan be a pain (it took six hours to rebalance when we
added a 100GB LUN, allowing it to be useable space), but other than
that, it works like a charm.

Regards,

Steve

Matthias Hoys wrote:
Hello,

I'm currently preparing the migration of 2 Oracle 8i and 9i databases
currently running on LPAR's with AIX 5.2 (IBM PowerPC) to Oracle 10g R2 on
RHEL AS/ES 4.0 with Intel or AMD hardware. We are moving away from AIX and
towards Linux and cheaper hardware to reduce hardware and maintenance costs
and because one of our software vendors doesn't support AIX anymore.
Now my question is, since the new server(s) will be connected to a SAN
(probably IBM or EMC), is it still useful to use ASM as storage for the
database files ? The sysadmin guys are against using a Linux LVM, since they
think it is not mature enough. So the only other option would be to use
"standard" Linux ext3 filesystems for the database files.
Is anyone using ASM on Linux production systems ? Any pro/contras ? What
about the combination ASM/SAN (double striping) ? ASM overhead versus
filesystem buffer cache overhead ? What would be the recommended database
block size when using ASM on Linux ?

Thanks,
Matthias

.

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