Intel AS/400 RISC Server, 170 Servers, 7xx Servers manual Intensive Workload

14.1.2.2

I/O Intensive Workload

2778 IOA vs 2757 IOA 15 RAID DASD

	50				2778/6718 10K RPM
					2778/6719 10K RPM
(MS)	40				2757/6718 10K RPM
					2757/6719 10K RPM
					2757/4326 15K RPM
Time
	30				2757/4327 15K RPM
					2757/4328 15K RPM
DASD Response
	20
	10
	0
	0	500	1000	1500	2000
			Ops/Sec

IOA and operation		Number of 35 GB DASD units (Measurement numbers in GB/HR)
2778 IOA		15 Units	30 Units	45 Units
*SAVF	Save	41	83	122
	Restore	41	83	122
2757 IOA
*SAVF	Save	82	165	250
	Restore	82	165	250

This restrictive test is intended to show the effect of the 2757 IOAs in a backup and recovery environment. The save and restore operations to *SAVF (save files) were done on the same set of DASD, meaning we were reading from and writing to the same 15, 30, and 45 DASD units at the same time. So the number of I/O DASD operations are double when saving to *SAVF. This was not meant to show what can be expected from a backup environment, see chapter 15 for save and restore device information.

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 14 DASD Performance	193