Hi Pavol

No answer for your specific question (why fsysinfo reports writes on a R/O fs) but you should have a look at the QNX 
system profiler and check what processes are talking to the file-system driver.  This would answer at least your real 
question (who is writing or trying to write to the filesystem).

You can start from these pages if you have never used the system profiler before:
http://www.qnx.com/developers/docs/6.5.0/index.jsp?topic=/com.qnx.doc.ide.userguide/topic/sysprof_INTRO_.html
http://community.qnx.com/sf/wiki/do/viewPage/projects.ide/wiki/SystemProfiler

Happy hunting,

--
Mate

From: Pavol Kycina <community-noreply@qnx.com<mailto:community-noreply@qnx.com>>;
Reply-To: <post90945@community.qnx.com<mailto:post90945@community.qnx.com>>;
Date: Mon, 16 Jan 2012 08:28:23 -0500
To: general-filesystems <post90945@community.qnx.com<mailto:post90945@community.qnx.com>>;
Subject: fsysinfo reports DISK I/O writes on read only filesystem

Hello,

I am trying to make small embedded system as power resilient as possible. That includes minimizing writes to storage 
medium.

I have come across puzzling situation.

I am trying to find the process which generates writes to one of the filesystems. These writes are reported by fsysinfo 
utility under DISK I/O write section. I have no clue which process it could be, so I mounted given filesystem as read-
only in a hope, that offending process would report some kind of error. To my dismay fsysinfo continues to report disk i
/o writes on this read-only filesystem. I have checked the read-only feature by trying to "touch file.txt", which failed
.

The filesystem in question is QNX6 one, OS version is x86 6.4.1.

Any idea what's wrong?

Thanks, PKY






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