Re: ASM on top of SLVM - HPUX - DW
- From: "Frits Hoogland" <frits.hoogland@xxxxxxxxx>
- To: John.Hallas@xxxxxxxxxxxxxxxxxx
- Date: Wed, 5 Nov 2008 14:57:16 +0100
ASM is oracle's implementation of both a (database only) filesystem and a
volume manager.
Adding another volume manager results in another layer which would be added.
On itself that isn't all bad (using a LVM has become facto standard in some
cases, for example AIX), and it can be used to work around some ASM features
(like breaking given SAN slices into pieces the same size as the current
pieces so IO doesn't get unbalanced). But the reason for the LVM you've
given does not sound like a good idea. Indeed learning them to use asmcmd
seems like a good idea then.
frits
On Wed, Nov 5, 2008 at 1:35 PM, <John.Hallas@xxxxxxxxxxxxxxxxxx> wrote:
>
>
>
> Environment HPUX 11:31 Oracle 11.1.0.6 ASM HP Superdome XP Array Storage
> Application - Data warehouse ~15TB
>
> We are being advised by 3rd party consultants to install HP SLVM (shared
> volume manager) to present the disks to ASM and use ASM for disk
> management.
>
> The advantages are supposed to be
>
> 1) If we ever go to a clustered system/database then having SLVM will be an
> essential building block in building Service Guard
>
> 2) It allows the Unix team to 'see' disk usage without using asmcmd
>
>
> I see 1) as an irrelevancy as if we do go to SG (highly unlikely as there
> is no business requirement) then we would use RAC as well and therefore
> that would be time to re-design the application and disk layout anyway.
>
> 2) has some merit but I am worried about supportability from Oracle if we
> have any disk issues.
>
> Does anybody know of a similar setup or have any thoughts on the matter
>
> Thanks
>
> John
>
>
>
>
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