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#1 (**permalink**) 01-04-2008, 06:58 PM

"quaixy" <mcquej@blueyonder.co.uk> wrote in message
news:3F26299E.1090706@blueyonder.co.uk...
> Hope I'm not asking for something that's been covered before.
>
> I’m working on a project, which will involve backing up an Oracle DB on
> an HACMP cluster across pseries LPARs, using SAN attached ESS storage &
> LTO tape library (SAN Gateway).
>
> I’d like to explore possible options. Here’s what seems to be on offer.
>
> Option 1. – Oracle DB server is SAN zoned such that it can access both
> the ESS disks & LTO tape library using the same fibre channel cards. TSM
> server pretty much just controls & monitors the process, doesn’t cache
> the data in storage pools or anything.
>
> My understanding is that having disk & tape on the same fibre channels
> isn’t a good idea but as I’m a SAN novice I’ll take any advice gratefully.

It is recomended to have disks and tapes on separate FC adapter.

>
> Option 2. – The TSM server is SAN zoned to the LTO tape library and to
> the ESS but using separate sets of fibre channel adapters. The TSM
> server mounts a snapshot of the database created using either ESS’s
> Flashcopy or a Split Mirror technique. Obviously the Flashcopy solution
> is better in that the mirror sync happens in the ESS rather than being
> driven by the DB server.
>
> Alternatively, are there any other techniques exploiting ESS or SAN
> features that should be considered, remembering that we don’t want to
> send any large volumes of data over the LAN.
>
> TIA
> Quaixy
>

#2 (**permalink**) 01-04-2008, 06:59 PM

Nenad wrote:

>>
>> Option 1. – Oracle DB server is SAN zoned such that it can access both
>> the ESS disks & LTO tape library using the same fibre channel cards. TSM
>> server pretty much just controls & monitors the process, doesn’t cache
>> the data in storage pools or anything.
>>
>> My understanding is that having disk & tape on the same fibre channels
>> isn’t a good idea but as I’m a SAN novice I’ll take any advice
>> gratefully.
>
> It is recomended to have disks and tapes on separate FC adapter.
It is recommended but I have never seen more than anecdotal evidense to
support that claim. This is a similar setup to what we use. Not everything
we have on our SAN is current using LAN-free backup, but some systems are
and others are moving towards it. All of our RISC systems (and all of the
Intel) on the SAN have dual HBAs (using SDD for the disk) with access to
disk and tape, and we do not experience any problems. Incidentally, the
wording I have read on the disclaimer about disk and tape sharing an HBA
seems to indicate only that it may be a problem in a single HBA
environment, not when multiple HBAs are being used and there is
load-balancing, etc. HTH.

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