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Sizing, Considerations, and Recommendations 69
• Sizings are done at a target server CPU utilization of 40% to 60%.
• Main memory is sized at 8 MB per active user and never to be less than 512
MB.
• Disk space is sized at 250 MB per user and either 23 GB (Oracle) or 45 GB
(SQL Server) for OneWorld objects, plus an additional 30% for free space and
then multiplied by 2 for RAID 1.
• For SQL Server a factor of 1.4 is applied to a given database size. Our
experience has shown that SQL Server needs that much more space to hold
the same database as in an Oracle or DB2/400 environment.
• We recommend a RAID 1 implementation in a Netfinity environment to ensure
adequate disk performance.
Comments regarding network performance impact and multiple database servers
also apply to the Netfinity server. With Netfinity we do not have available any
standard interactive performance tests (like CPW for AS/400 or OLTP for
RS/6000) so we cannot effectively scale our measured performance results into
the other members of the Netfinity product line. Therefore we can only size for
each individual member of the Netfinity line after we have been able to
performance test it.
To date we have completed testing for a Netfinity 7000-M10 server (4-way mode)
running the Oracle database. These tests were done with the 400 MHz processor
cards with 1 MB level 2 cache. We then use a rule of thumb to project the
performance of the 512 KB level 2 cache CPU cards.
We have also tested the Netfinity 5500-M10 server with both 350 MHz and 400
MHz processors with the Oracle database. Testing with the Netfinity server was
performed using the ServeRAID II adapter and 4.51 GB 10,000 rpm disk drives.
This high performance disk configuration proved to be critical to achieving good
OneWorld response times.
Recently announced IBM Netfinity servers will provide even greater performance.
We are presently engaged in providing new performance test information using
these new systems. To view the Netfinity systems, see Chapter 4, “IBM Netfinity
Family of Servers” on page 19 of visit the IBM Netfinity Web site at:
http://www.pc.ibm.com/us/netfinity/index.html.
All Netfinity servers for use with OneWorld should be configured for RAID 1 using
the latest ServeRAID-3HB and 3L Ultra2 SCSI adapters.
The ServeRAID-3HB and 3L Ultra2 SCSI adapters. The ServeRAID-3HB Ultra2
has three SCSI channels whereas all can be externally accessible from a single
PCI slot and 32MB of mirrored write cache included as standard for high
availability and true enterprise storage. Using an advanced RISC I/O processor
on the ServeRAID-3L Ultra2, the Ultra2 SCSI technology with twice the date rate
of Wide Ultra SCSI, and an advanced 64-bit, high performance (up to 264Mbps)
PCI interface, you can support data-intensive applications. The ServeRAID-3L
provides one SCSI channel and 4MB cache. The Ultra2 SCSI channels are
capable of supporting up to 15 devices each at up to 80 MBps data throughput.
Select Netfinity models support up to eight adapters for up to 8.7 TB of external
storage using the Netfinity EXP15.