Compaq Proliant Storage System U2 and Kouwell adapters

[Michael Ault]

If it had four connectors I would have done this
already. Unfortunately it only has two. I have looked
at the backplane and there are no shorting pins, no
connectors to enable the sharing. The disks will be
used through Oracle cluster services and ASM which
allows sharing because Oracle manages the locking
latching and IO using CRS and ASM services.

Looks like I may need a 2X4 scsi switch to allow
sharing 2 scsi arrays (one on each channel) with 4
systems. 

Believe me, I have investigated the obvious and the
not so obvious before I posted...

Mike
--- Kenneth Goodwin <kgoodwin at datamarktech.com> wrote:
> from the sound of it,I believe he just needs to
> short cable
> between the two halves.
> It depends on how things are labeled.
> I believe the box may have just two separate
> backplanes.
> If it has Four Scsi connectors on the back, then
> connector
> one is primary IN
> connector Two functions as either TERMINATOR One or
> Daisy
> Chain OUT
> Connector three is either Secondary in or Daisy
> Chain IN and
> connector Four is either Terminator Two or daisy
> chain to
> next cabinet.  For sharing under this arrangement,
> there
> would have to be a second set of connectors
> Or you could do the following (modify scsi id's
> accordingly):
> 
> 	Server1 Controller scsi id set to 0
> 	cable controller to Primary IN port connector one
> 
> 	Daisy chain using short scsi cable from Daisy chain
> out to
> daisy chain In (connector two to connector three)
> 		(This couples the two backplanes together giving
> you
> access to all drives in the array)
> 	Drives are scsci 1 through scsi 13
> 
> 	Server2 controller scsi id set to 15
> 	cable controller to connector four
> 
> 	Now both controllers will see all drives and each
> other.
> 
> 	however - BOTH SERVERS CAN NOT Generally read/write
> to the
> same slices/filesystems on the disks.
> 	Otherwise you will get corrupt filesystems. Even in
> a
> READ/write server 1, read only server 2
> 	config there are issues becuase of the server based
> caching.
> 
> >  -----Original Message-----
> >  From: redhat-install-list-bounces at redhat.com
> >  [mailto:redhat-install-list-bounces at redhat.com]On
> Behalf
> Of
> >  Rick Stevens
> >  Sent: Monday, March 22, 2004 1:49 PM
> >  To: Getting started with Red Hat Linux
> >  Subject: Re: Compaq Proliant Storage System U2
> and
> Kouwell adapters
> >
> >
> >  Michael Ault wrote:
> >  > I am trying to configure a shared storage
> system using
> >  > the Compaq Proliant Storage System U2 with
> Kouwell
> >  > Scsi cards to two RedHat 3.0 AS systems. This
> uses the
> >  > initio drivers. I have got the systems to "see"
> the
> >  > array but the one plugged into channel 1 sees
> only the
> >  > first 6 drives and the one plugged into channel
> 2 sees
> >  > only the last 6 drives. I need both systems to
> see all
> >  > the drives. I get devices 1-15 when looking at
> the
> >  > configuration tool at boot time, but with Linux
> system
> >  > 1 the first six drives show up with 1-6 as the
> first
> >  > drives listed and nothing for the second set,
> and with
> >  > linux system 2 I get drives 7-13 showing up as
> 1-6 and
> >  > nothing showing up as 7-13.
> >  >
> >  > Any one seen this type of behavior? Do I have
> to use a
> >  > SCSI switch? (I hope not, those darn things are
> >  > expensive).
> >
> >  I've done similar stuff but not with the Compaq
> device.
> It
> >  sounds more
> >  like a LUNning issue with the Compaq than an
> issue with
> >  Linux.  It was
> >  with the thing I used.  The storage controller,
> by
> default, presented
> >  the drives as LUNs under a single SCSI ID and
> split them
> up
> >  between the
> >  external SCSI ports.  When I reconfigured it to
> treat the
> drives as
> >  individual SCSI IDs rather than LUNs and told it
> to make
> all drives
> >  available to all SCSI ports, it worked peachy.  I
> can't
> >  recall who the
> >  maker of the device was.  If it's important, I
> can dig it
> up
> >  (the unit
> >  is in storage right now as the client that used
> it went
> belly-up).
> >
> >  If the Compaq devices is configured to present
> all drives
> to all SCSI
> >  ports, it should work.  As it stands, it looks
> like
> you've got it set
> >  to split the drives beween the two SCSI ports. 
> Since I'm
> >  not familiar
> >  with the specifics of the Compaq, I can't help
> beyond
> that other than
> >  what I said above.
> > 
>
---------------------------------------------------------
> ----
> >  ---------
> >  - Rick Stevens, Senior Systems Engineer
> >  rstevens at vitalstream.com -
> >  - VitalStream, Inc.
> http://www.vitalstream.com -
> -                                                   
>        
>          -
> -     Is that a buffer overflow or are you just
> happy to see
> me?     -
>
------------------------------------------------------------
> ----------
> 
> 
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=====
Michael R. Ault
Senior Technical Management Consultant
TUSC -- The Oracle Experts WWW.TUSC.COM

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