Read-only disk problem
Engineering
ee at athyriogames.com
Tue Aug 30 14:50:30 UTC 2011
Hi, I've attached some more info. Doing a fsdump shows the following changes
over reboot
magic 19540119 (UFS2) time Tue Aug 30 03:08:04 2011
...
cg 1:
magic 90255 tell 4b1c000 time Tue Aug 30 03:08:04 2011
Changes to
magic 19540119 (UFS2) time Tue Aug 30 03:13:14 2011
...
cg 1:
magic 90255 tell 4b1c000 time Tue Aug 30 03:13:14 2011
Sam
-----Original Message-----
From: owner-freebsd-fs at freebsd.org [mailto:owner-freebsd-fs at freebsd.org] On
Behalf Of Engineering
Sent: Monday, August 29, 2011 2:15 PM
To: freebsd-fs at freebsd.org
Subject: Read-only disk problem
Please let me know if this is the wrong place to ask. I am working on an
embedded system using FreeBSD 7.2, bootinf and running off of flash memory.
In order to not burn out the flash, I use the 'diskless' scripts and mount
the flash read-only. I have used this configuration successfully in the
past.
I've recently added a utility to check for disk corruption, basically
checksumming the / and /usr partitions. Since they are both read-only, I
thought this would work. What I have discovered is that something in the
partition is changing between boots.
I dd'd the flash over a couple of boots, and compared the binaries to see
what was changing. It is a small amount of data, spread across the disk, in
an interval that looks very similar to the interval of the 'superblocks'
Is there any data that is written to the disk at boot or mount time, and if
so, is there a way to prevent it?
Thanks
Sam
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