John,
We are using SAP Backup Utility to run offline on the weekend and online
daily. SAP Backup Utility works great with IBM's Backint and ADSM. These are
good tools and very simple to use. We see the same rate (7GB/hr for a single
stream) for both offline and online backup during the off hours.
It is a miracle when SAP responses to anything.
I have raised the issue of interleaving backup sessions to a single tape
with IBM. They gave me the same answer. Our SAP System will be 24 by 7 next
year. The 3590 tape drive is just too expensive. I am viewing alternative
solutions.
At 12:11 PM 8/8/96 -0400, you wrote:
>Michael,
> Is your rate 7GB/hr for a single stream realized during an off-line
>backup (Oracle is down), or while Oracle is up and in use in backup mode?
> Tuning backup performance in an on-line mode complicates quite a bit.
>Our system is 24 by 7, is made up of multiple SP2 towers and RS6000 R30
>systems, and we're expecting to exceed a terrabyte per database in a few
months.
> The issue of interleaving or multiplexing backup sessions to a single
>tape is an issue I've also raised with IBM. The usual response is to suggest
>buying more tape drives, one per backup session. But, as you said, the 3590
>tape drive is NOT cheap . Given the the 3590 is rated to accept data at a rate
>of over 10MB/second, and the disk drives and systems can only sustain a single
>backup session rate of 3MB/second (absolute peak), we either need to make
>better use of the 3590's or use a more economical, lower speed tape drive with
>ADSM. Other vendor's backup products support interleaving/multiplexing, why
>not ADSM? IBM recently announced selling another product that DOES profess to
>support interleaving, but it doesn't seem to be integrated with ADSM or SAP.
> One help for this problem of performance may be use of Oracle's obackup
>utilities with ADSM, when it becomes available (I believe it's expected by
>September sometime). Oracle itself can interleave backup sessions of its
>database components BEFORE feeding it to ADSM for transfer to tape. My
>current problem is getting SAP to respond to my questions about if/when using
>these features of obackup with ADSM will be supported by their SAPDBA tool
set.
> John Howard
>
>
>-----------Previous Note -----------------------------------
>To: ADSM-L @ VM.MARIST.EDU (Multiple recipients of list ADSM-L) @ internet
>cc: (bcc: John Howard/RICHMOND/PMU/PHILIP MORRIS/US)
>From: michael.louie @ CORP.VARIAN.COM (Michael Louie) @ Internet @ WORLDCOM
>Date: 08/06/96 11:53:41 AM CDT
>Subject: Re: 3590 High Performance Tape Subsystem with the Magstar
>
>John,
>
>Varian is also running SAP/R3 environment with Oracle. The backup rate will
>depend on your hardware configuration and the SAP Filesystems disk layout.
>Our backup rate is about 7GB/hr for a single stream. 13.365GByte/hour is the
>best time for two streams after making a number of changes to the SAP
>Filesystems disk layout. We have compress mode off.
>
>The ADSM architecture does not permit us to "interleave" or "multiplex"
>multiple backup streams or sessions onto a single tape drive to take
>advantage of the 3590's speed. This is an issue for us. I have complaint
>this to IBM. The 3590 tape drive is NOT cheap.
>
>
>----------------------Reply Separator---------------------------------
>
>From: John Howard <John_Howard%PMUSA AT NOTES.WORLDCOM DOT COM>
>Subject: Re: 3590 High Performance Tape Subsystem with the Magstar
>Comments: To: Stacy Lacy <Stacy_Lacy AT CARGILL DOT COM>
>To: Multiple recipients of list ADSM-L <ADSM-L AT VM.MARIST DOT EDU>
>
>Stacy,
> What kind of backup rate are you experiencing (megabytes per minute)?
>We've had our 3494 up for a few months. We backup AIX file system and Oracle
>databases in an SAP/R3 environment, and cannot fully utilize the rated speed of
>the 3590 drives, no matter what disk drives are used. The ADSM architecture
>does not permit us to "interleave" or "multiplex" multiple backup streams or
>sessions onto a single tape drive to take advantage of the 3590's speed. Is
>this an issue for you?
> John Howard
>Michael Louie
>Varian Associates
>415-424-5055
>
>
Michael Louie
Varian Associates
415-424-5055
|
