~4Dgifts/toolbox/perfTuning/ChallengeIO README
These slides were prepared by engineers within Silicon Graphics primarily
as a presentation for internal SGI employees. Its purpose is to help
people find out how to make the best use of our systems and show what can
be done.
In this presentation, references are made to firmware upgrades that allow
full video i/o from/to disk. At the time of writing, that firmware was
not released. It has now been released and been cut into manufacturing.
Disks in the field prior to this release will not have this new firmware
and there are currently no plans to retrofit this firmware.
CHALLENGE I/O Performance
Disk.perf.p1.sc: 43 pages
SCSI IO BASICS-A Tutorial
Benchmark Methodology
5.1 Benchmarks
RAID Performance
Topics Discussed in PART 2:
Various Performance Topics
5.2 Raw, Direct I/O and EFS Results for 1 & 4 segments - striping
5.2 Raw/Direct/EFS for Write Through/Buffered Disk Cache - striping
5.2 Step Size Variation - striping
Disk.perf.p2a.sc: 41 pages
I/O Capability of Challenge/Onyx
What is a Megabyte?
IOPS versus Megabytes/sec
Striping Benchmark Results
Disk.perf.p2b.sc: 35 pages
Write Buffering (also known as write caching)
Disk.perf.p2c.sc: 20 pages
How to configure for optimal striping
Real time (guaranteed data rate)
Our SCSI implementation
Seagate 7200 RPM 2.1 GByte disk drive -- Faster?
Documentation
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