RE: No performance increase from 3590 B11 to 3590 E11

[Glenn Ericson <Glenn-Ericson@xxxxxxx>]

Charly,  You are  right. As I recall 
the  sequence of the controllers on the  bus is important as is
the number of tape drives .   We were real careful in 
how  the busses were build. Our clients  730  is an LPARed
system and  we  had  at least 6  3590/B11 which we
upgraded to E11s.   They fly  at   extremely near
rated  speeds. Usually there is one/ bus  but we might 
run 2 at times. All  have dual SCSI cables etc, attached to PCI
buses with the best IBM technology card for PCI & the 730.



Glenn 
__________________________________ 
Glenn
Ericson,                     
IBM Certified Specialist  
Phoenix Consulting LLC  ,  East Elmhurst, NY USA  
Phone 718 898
9805           
Fax 718 446 1150 
mailto:Glenn-Ericson@att.net
___________________________________

At 02:37 PM 02/02/2001 -0500, Charly Jones wrote:
> Charly, thanks for responding. Just saw your note, but the 3590 is the only
> drive on that bus. It's not sharing any disk drives. Thanks. 
>
>
> Paul Talbert
> Integrated Solutions & Services, Inc.
> (908)534-7831 ext 25
> email: ptalbert@iss2000.com
>
>
> -----Original Message-----
> From: Charly Jones [mailto:charly301@hotmail.com]
> Sent: Thursday, February 01, 2001 12:23 PM
> To: MIDRANGE-L@midrange.com
> Subject: Re: No performance increase from 3590 B11 to 3590 E11
>
>
> Paul,
>
> The system bus that your 6534 SCSI card is attached to can be a
> performance bottleneck.  What else is attached on that bus?
> If some of the disk drives that are being backed up
> are using up the bus bandwidth you won't get full rated speed
> on the SCSI card.
>
> I know a shop that has four 3590 drives that they like to keep
> busy during their nightly backup.  Each SCSI card that drives
> a 3590 is in a separate tower, on a separate bus.  No disk drives
> or anything else in four towers.  Their backup performance
> numbers would take
> your breath away, but they spent some money to maximize their
> throughput.
>
> Charly
> Geezer in Gig Harbor
>
>
> >From: "Talbert, Jr., Paul" <PTalbert@iss2000.com>
> >Reply-To: MIDRANGE-L@midrange.com
> >To: "'MIDRANGE-L@midrange.com'" <MIDRANGE-L@midrange.com>
> >CC: "Avedissian, Edward" <EAvedissian@iss2000.com>
> >Subject: No performance increase from 3590 B11 to 3590 E11
> >Date: Thu, 1 Feb 2001 10:07:57 -0500
> >
> >I currently have a model 730 running V4R4 and have currently upgraded from 
> >a
> >3590 B11 to a 3590 E11. The drive is attached to a 6534 SCSI SPD card.  I'm
> >not seeing the promised 50% increase on my full system backups. The backups
> >have run for 10 hours on both the B11 and E11.  IBM states that the E11 has
> >a faster data transfer rate of 14mbs vs 9mbs for the B11.  Has anyone
> >experienced this problem? Any suggestions?  Thanks
> >
> >Paul Talbert
> >Integrated Solutions & Services, Inc.
> >(908)534-7831 ext 25
> >email: ptalbert@iss2000.com
> >
> >+---