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EXT3 Corruption Question



Greetings Everyone,

	A group in my office is designing/integrating what I would loosly label as an "embedded system".  In that, it performs a dedicated task and is not a general purpose workstation or server.   It operates in a harsh environment, particularly a questionable power environment and they are extremely concerned about inadvertent shutdown and recovery.  They were totally unaware of journalling filesystems in general so I filled them in on ext3.  I am quite an ext3 novice myself ( boy do I LOVE it on my laptop! ) so when they come to me with questions, I hedge my answers, and I don't like to do that.

	Here is their inquery in a nutshell.  1)  The filesystem is on a battery backed up solid state device.  2)  they do not care about the time necessary for recovery and avoiding corruption is paramount.   3)  OS is a non-RTOS  4)  The power just went out, you have 20 milliseconds.....    How can corruption be avoided in this case?  CAN it be avoided?   If not, under what type of circumstances would the filesystem become corrupt (so we can mitigate these circumstances)?

Thanks very much.

	

Regards,

Gary Huntress
Code 4113
Naval Undersea Warfare Center
Newport, RI  02841
1-800-669-6892 x28990





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