>Hello All
>
>Apologies for sounding like a stuck record - I have submitted this query but
>never saw it posted, so I don't know if it actually went out! Here goes:
>
>
> We currently have two RS6000 J30's in an HACMP cluster  with shared SSA
> disks.
>
> Our ADSM backups are done onto two 3570 B12's, both of which are connected
> to the one RS6000 (Which is also the ADSM server).
>
> We are planning an upgrade to a 3575 L06 / L12 for increased capacity. It
> has been suggested that we connect the tape drive to the SSA loop via a
> 2108 SSA/SCSI adapter so that we are no longer dependant on one of the
> RS6000 to support the tape drive.
>
> Has anyone used / investigated the use of a SSA / SCSI adapter for such a
> tape-drive connection ?
>
> Any performance problems / improvements or other suggestions would be very
> much appreciated.
>
> We run AIX 4.1.5.  ADSM Server 3.1.2.20
>
>
> Many thanks
>
> Grant Cohn
> Shell & BP Petroleum Refineries
> Prospecton
> DURBAN
> South Africa.

Why don't you connect the 3575 to both RS/6000 ?? The 3575 is differential 
SCSI, so you add the ADSM
Server to the HACMP cluster and twintail the 3575.

We have a HACMP ADSM Server implementation on two SP2's with a 3494 and 8x3590 
Tape drives witch
are twintailed to a node in each SP2. This should work without big problems.


Stefan Gocke
GE CompuNet Frankfurt
Volta Str.1
60486 Frankfurt
Stefan.Gocke AT gecits-eu DOT com (or: gocke AT ibm DOT net)
Mobil: +49-172-6841213 / Tel: +49-69-97779-130 / Fax: +49-69-97779-286
Certified IBM Specialist ADSM / SP / AIX / CommServer