Re: ASM and VMWARE

Yes, I'm familiar with that.
I'm looking for some real life experiences.

Thanks again

On Fri, Jun 14, 2024 at 3:16 PM dougk5 <dougk5_at_cox.net> wrote:
>
> VMWare has a best practices guide for Oracle that you can find with a web search.
>
> Doug
>
>
> On Fri, Jun 14, 2024 at 12:10 PM, Ed Lewis
> <eglewis71_at_gmail.com> wrote:
> Thanks Osman.
> I'm familiar with the information you provided, but I would like to know if
> these same guidelines apply to VMWARE, and EMC.
>
> Thanks again.
>
> ed
>
> On Fri, Jun 14, 2024 at 3:02 PM Osman DINC <dinch.osman_at_gmail.com> wrote:
> >
> > Hi Lewis,
> >
> > Oracle recommends using four (4) or more disks in each disk group. Having multiple disks in each disk group
> > spreads kernel contention accessing and queuing for the same disk.
> >
> > https://docs.oracle.com/cd/E11882_01/server.112/e10803/config_storage.htm#HABPT4790
> >
> > The number of LUNs (Oracle ASM disks) for each disk group should be at least equal to four times the number
> > of active I/O paths. For example, if a disk group has two active I/O paths, then minimum of eight LUNs
> > should be used. The LUNs should be of equal size and performance for each disk group.
> > An I/O path is a distinct channel or connection between storage presenting LUNs and the server. An active
> > I/O path is an I/O path in which the I/O load on a LUN is multiplexed through multipathing software.
> > Ensure that all Oracle ASM disks in a disk group have similar storage performance and availability
> > characteristics. In storage configurations with mixed speed drives, such as flash memory and hard disk drives
> > (HDD), I/O performance is constrained by the slowest speed drive.
> >
> > https://docs.oracle.com/en/database/oracle/oracle-database/19/ostmg/considerations-asm-storage.html#GUID-18D7AFB2-F417-4E1F-B3B0-02585E385818
> >
> > Multiple ASM disks allow for multiple I/O queues in the OS, and so can assist with performance. However
> > too many disks may prove cumbersome to manage.
> >
> > Regards,
> > Osman DİNÇ
> > https://dincosman.com
> >
> >
> > Ed Lewis <eglewis71_at_gmail.com>, 14 Haz 2024 Cum, 21:57 tarihinde şunu yazdı:
> >>
> >> 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
> >> --
> >> http://www.freelists.org/webpage/oracle-l
> >>
> >>
> --
> http://www.freelists.org/webpage/oracle-l
>
>

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