Re: ASM and VMWARE

Hi

I am not sure if there are performance gain have 1 large LUN o smaller 4 LUN in modern SAN where a LUN expands in many physical disks but I have customers who asks the same question in non-vmware infrastructure and my argument is if you use a large LUN you need to expand the space using that LUN size so you are gonna waste space but if you use smaller LUN the expand with smaller LUN Size which probably is more suitable for the database growth and the discussion ends there.

Thank you

On Fri, Jun 14, 2024 at 8:58 PM Ed Lewis <eglewis71_at_gmail.com> wrote:

> Hi,
>
> I recently took on a project with a new client.
>
> I’m tasked with building several databases in a RAC environment (19.23)
>
>
>
> ASM is being used with VMWARE on a EMC Unity Array. I recommended
>
> creating a few disk groups with a minimum of 4 LUNS (same size) for each
> group.
>
>
>
> The unix admin is against doing that saying that just use 1 large
> disk for each group.
>
> He says it’s a disadvantage when using a virtual disk infrastructure
> like we have with our EMC Unity disk farm.
>
> He states it is actually a disadvantage to carve up such small
> physical disks at the SAN Storage Array processor
>
> level and is not actually even possible as only whole disks can be
> assigned to a particular use at that level.
>
>
>
> Although, I have not worked much with VMWARE, I’ve never heard of
> these restrictions
>
> when using ASM, so I have my doubts.
>
> Any thoughts or experiences on this would be greatly appreciated
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>
>
>

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