Re: 10g RAC using SAN for storage

macdba321 wrote:

> On Sep 15, 4:52 pm, DA Morgan <damor..._at_psoug.org> wrote:
>> macdba321 wrote:
>>> On Sep 12, 9:29 pm, DA Morgan <damor..._at_psoug.org> wrote:
>>>> macdba321 wrote:
>>>>> On Sep 12, 9:35 am, DA Morgan <damor..._at_psoug.org> wrote:

>>>>>>> I am testing a 2 node RAC setup and want to try using a SAN for the
>>>>>>> dedicated storage (instead of a dedicated local storage disk array
>>>>>>> located within the same frame).
>>>>>>> Are there any "gotchas" that I should be aware of when using the SAN
>>>>>>> for storage as opposed to a typical storage array?
>>>>>>> Thanks!

>>>>> Thanks for the reply.
>>>>> I plan to use ASM over raw devices. (Again, this is purely for test/
>>>>> learning, not a production application.)
>>>>> Please correct me if I'm wrong, but I'm assuming that I'll need HBAs
>>>>> for both nodes to connect to the same LUNs on the SAN? (There's no way
>>>>> to do it without the HBA is there?)
>>>>> Thanks.
>>>> Not with a SAN unless you have an antique with fibre protocol over
>>>> copper and can find drivers for it. Another possibility is to use
>>>> iSCSI drivers.
>>>> --
>>>> Daniel A. Morgan
>>>> Oracle Ace Director & Instructor
>>>> University of Washington
>>>> damor..._at_x.washington.edu (replace x with u to respond)
>>>> Puget Sound Oracle Users Groupwww.psoug.org
>>> Thanks again for the reply. I will proceed with acquiring HBAs for
>>> each node.
>>> A related question if I may: Why would one require a single-channel
>>> Vs. dual-channel HBA in each node?
>>> Thanks again!
>> Dual channel cards are good for bonding to obtain higher bandwidth.
>> I like to have two cards, bonded, so that if one card fails it does
>> not become a single point of failure.
>> --
>> Daniel A. Morgan
>> Oracle Ace Director & Instructor
>> University of Washington
>> damor..._at_x.washington.edu (replace x with u to respond)
>> Puget Sound Oracle Users Groupwww.psoug.org
> 
> Thanks again.
> For a prototype effort though, I could proceed with single channel
> HBAs on each node, correct?
> One additional question, if the nodes have multiple NIC cards, would
> they serve as the "dedicated high-speed interconnect" that rac
> requires?
> 
> Thanks!

You should have a minimum of four interfaces. Two double port NIC cards and two dual channel HBAs. Again, bond so that you have two paths to public, two paths for cache fusion and two paths for storage (HBA).

-- 
Daniel A. Morgan
Oracle Ace Director & Instructor
University of Washington
damorgan_at_x.washington.edu (replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org