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FIle system Benchmark doesn't work for Mapper Application

Posted: 02/20/2010 11:07:24
by Abhay Gumaste (Basic support level)
Joined: 01/27/2010
Posts: 14


I was doing some file system benchmarking for file system, so I found very good tool "IOZONE" for doing this. You can check this on http:\\iozone.org

I installed IOZONE on C drive and execute Mapper application and run below command to check Z: file system benchmarking.

iozone -f Z:\temp.txt

Here -f is used to test file system benchmarking of Z:\ drive and temp.txt is temperory file which will gets deleted after calculating the benchmarkings.

It gives me an error "Permission denied".

So for again testing purpose I stopped Mapper application and execute VMounter application.
Here I used above listed command, so it gives me the result not any error.

Same case with VDisk application.

Can you please give some suggestions/ideas why it's not working in case of "Mapper" application?
Posted: 02/20/2010 11:15:08
by Eugene Mayevski (Team)

Mapper reads and writes the data from the actual disk, and it's possible that the folder that you have mapped is not fully accessible (eg. some operation, that the benchmark tool is trying to perform, is not allowed).

Sincerely yours
Eugene Mayevski
Posted: 10/18/2012 12:04:28
by Kenny Kim (Standard support level)
Joined: 08/19/2009
Posts: 38


I also tried to use benchmarking tool Iozone to benchmark our file system (server is a Linux-based machine, connection between server and client is made via TCP/IP).
I have installed Iozone directly to the virtual drive, and run it from there:

Z:\>IOZONE\iozone.exe -a

And I am receiving this result:
Run began: Fri Oct 19 01:22:42 2012

Auto Mode
Command line used: iozone -a
Output is in Kbytes/sec
Time Resolution = -0.000000 seconds.
Processor cache size set to 1024 Kbytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
random random bkwd record stride
KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
64 4 2845 9686
Error reading block 1 7de00000
read: Permission denied

Then,I installed Iozone to E:\Test, and mounted a drive using Mapper sample, specifying base folder as E:\Test. After performing Z:\>iozone.exe -a I am getting the following result:
0 [main] iozone 15272 Z:\iozone.exe: *** fatal error - add_item ("у╜Ь?", "/", ...) failed, errno 22
Stack trace:
Frame Function Args
00288998 6102796B (00288998, 00000000, 00000000, 00000000)
00288C88 6102796B (6117EC60, 00008000, 00000000, 61180977)
00289CB8 61004F1B (611B862C, 0028BCDC, 00000016, 0003000A)
0028CCE8 61080AFA (60FC000C, 61209E10, 0028CD68, 61073F40)
60FC0000 610C151D (00000000, 00000000, 00000000, 00000000)
End of stack trace

I have traced file system activity with Process Monitor, and I noticed that in both cases iozone is failing after QueryNameInformationFile operation.

CBFS ver.:
Win 7 x64

I would appreciate any ideas about why it is happening like this.

I have uploaded log files to http://depositfiles.com/files/w1ylszkjy

Thank you
Posted: 10/22/2012 04:25:19
by Kenny Kim (Standard support level)
Joined: 08/19/2009
Posts: 38

Good evening.

I was wondering about the status of the problem I have described in my previous message.

Thank you.
Posted: 10/22/2012 05:27:08
by  Eugene Kozarovitsky

The message "fatal error - add_item ..." was generated by cyqwin. It cannot run Iozone from the root folder.
Please, use VDisk sample, create folder (eg. Z:\Test) and then run Iozone from this folder.

Eugene Kozarovitsky



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