strange result and sequential with # of Outstanding I/Os

[Michael Gu]

Hello,

I am a new subscriber in this list, now I perform Samba performance test by Iometer (version 2006.07.27), but I got strange results.
When the Of Outstanding I/Os is 1, Transfer Request Size is 8 K and 32 K, the results can not be accepted, why the results are these?
When Of Outstanding I/Os is 4, the results are better, But I noted a Hint on page 52 of Iometer Users’ Guide:  To access a disk drive sequentially, select it with a single worker using a “# of Outstanding I/Os” value of 1.
I could not understand them, could someone help me? Thanks.

Of Outstanding I/Os is 1:
Transfer Request Size         Write MBs          
1 K                                    1.7
2 K                                    3.2
4 K                                    7.6
8 K                                    0.3 
16 K                                  14.5
32 K                                  8.2
64 K                                  31.1
128 K                                38.4
256 K                                40.7
512 K                                42.7
1 M                                   45.1

Of Outstanding I/Os is 4:
Transfer Request Size          Write MBs          
1 K                                    4.2
2 K                                    5.0
4 K                                    20.4
8 K                                    32.2
16 K                                  42.4
32 K                                  43.5
64 K                                  45.5
128 K                                47.3
256 K                                49.3
512 K                                50.2
1 M                                   50.0

Below all are the same configurations in Iometer:
iobw.tst size is about 5G,
Run Time all is 3 minutes,
Ramp Up Time is 30 seconds,
100% Access
100% Write
100% Sequential
Burst Length 1
Sector Boundaries
No Rely



The Server is installed Linux 2.6.21.1 and contain Samba 3.2, Ram is 1 G, I created a Share(50G) in Raid 5 volume what by 5 disk(500G, 2 Seagate ,2 Hitachi and 1 Hitachi Spare), Marvell SATA Controller,

The Computer is installed Windows XP SP3, P4 3.06GHz, 1G Ram,

1000M Ethernet, connect the Server and Computer by a 1000M Switch.

Map the Share(50G) in Windows, the Driver character is w, and all test only in this Share.


Thanks
Michael

[Campos_Luis]

 
Hello,

I am trying to run Iometer in windows 2003 R2 Service pack 2. The drives
are formatted at 520 Does Iometer support this format type? Windows see
the drives but they are not initialized and Iometer does not see them...

Any help would be greatly appreciated

Luis

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