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13050 - ASP + Shark
Vendor Master (General Section) BAL Application Log DocumentationThis documentation is copyright by SAP AG.
ASP + Shark
For direct attach disk, RAID-5 on iSeries with the new PCI-X ultra
RAID disk controllers now allows a minumum of 3 drives (previously 4)
in a RAID set.
This is useful for partitioned machines where you want a thin Primary
LPAR.
The maximum drives in a RAID set with the #2757 and #2782 controllers
has increased to 18 and 12 (from 10 previously), and you get to
choose from 3 options when setting up RAID from V5R2: Capacity,
Balance or Performance. With Peformance you will get more RAID
arrays, with Capacity you get the least, and Balance is the in-
between choice.
There is more about the controllers in the Performance capabilities
reference at
http://www-1.ibm.com/servers/eserver/iseries/perfmgmt/resource.htm
regards,
Michael
Michael Power
Data#3 Limited
Level 2, 107 Mount Street
North Sydney NSW 2060
Ph: 61-2 9081 9500
Mobile: 0413 153 187
EMail: michael_powerZd...
--- In DoNotReply@consolut.eu, "Volker Gueldenpfennig"
<volker.gueldenpfennigZs...> wrote:
> Hi Vincenzo,
>
> what shall I say ?
>
> The recommendation from SAP GoinLive to use Mirroring is definetely
> still there. This is because of the safety.
> In the meantime IBM changed the controllers and with newest
hardware
> it is faster to use RAID-5 for the ASP2 than mirroring - please
don't
> ask me why but that is the case.
> As RAID-5 needs at least 4 drives, you either put really one
complete
> raid-set of 4 drives into asp2 which is mostly too costly at the
> customer. Or you use mirroring. But, please do NOT use raid-5 with
a
> mixture of ASPs in the raid-set! If you should do this, you have in
> reality only 1 ASP, but you won't see this!!! So, if you prefer the
> last approach, please do it right and use only 1 ASP. Then
everybody
> sees what's the reality and RAID-5 protection is not too bad as
well,
> is it?
>
> So, it is your and the customers decision what to do:
> - Use the SAP recommendation and be 200% safe
> - use 1 ASP and be only 100% safe and faster with mass updates
>
> Or create a really large (many disk arms) ASP2 and have both ...
>
> Sorry,
>
> Volker
>
> --- In DoNotReply@consolut.eu, "Vincenzo Boesch"
<vboeschZb...>
> wrote:
> > What about the recommendation from SAP using 2 ASP's and use
> mirroring
> > protection for the 2nd ASP? Is it the same with the performance?
> >
> > I have seen this recommendation in many GoingLive Checks in the
> past. I have
> > set-up all the AS/400 with 2 ASP's during my last 7 years - some
of
> them
> > with mirroring and some with RAID-5 - but many times I was
thinking
> to
> > create only one ASP...
> >
> >
> > -----Ursprüngliche Nachricht-----
> > Von: Volker Gueldenpfennig [mailto:volker.gueldenpfennigZs...]
> > Gesendet: Donnerstag, 26. Februar 2004 15:20
> > An: DoNotReply@consolut.eu
> > Betreff: Re: ASP + Shark
> >
> > Hi Jürgen,
> >
> > the official recommendation is still to use 2 ASPs. But, I would
> use
> > only 1 ASP any more. The Shark uses at least RAID-5 protection.
So,
> a
> > disk-data loss is pretty unlikely.
> > As a small ASP2 with only 1-2 disks is known to be VERY slow in
all
> > circumstances where mass updates are running (e.g. client-copy,
> > client-delete, etc.) I would go for 1 ASP only.
> >
> > But the decision needs to be done on your site.
> >
> > Regards
> >
> > Volker
> >
> > --- In DoNotReply@consolut.eu, juergen.daunerZm... wrote:
> > > Hello,
> > >
> > > we have a IBM Shark and only one ASP configuered. Is it
> recomended
> > to
> > > configuere 2 ASP´s although we have a Shark ?
> > >
> > >
> > > Jürgen
> > >
> > >
> > >
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