Re: No performance increase from 3590 B11 to 3590 E11

["Alexei Pytel" <pytel@xxxxxxxxxx>]

How fast the system can save the data is not determined entirely by a rated
speed of a tape drive.
It is a complex function, depending on:
- tape drive rated speed
- IOP capabilities
- speed of CPU
- number of disk units
- data characteristics (eg how well it can be compressed and how it is
spread over disk units)
- workload type - eg few large files or many small ones
- main storage size

More details in Chapter 15. Save/Restore Performance, in AS/400 Performance
Capabilities Reference
Version 4, Release 5,
http://publib.boulder.ibm.com/pubs/pdfs/as400/V4R5PDF/AS4PPCP3.PDF

    Alexei Pytel



"Talbert, Jr., Paul" <PTalbert@iss2000.com>@midrange.com on 02/01/2001
09:07:57 AM

Please respond to MIDRANGE-L@midrange.com

Sent by:  owner-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



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

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