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file system with no gratuitous writes?
I'm building a compact flash-based system for a Soekris box. I'd like to set
it up so that there are no write operations that are not specifically initiated
by the administrator. That is, if I modify a configuration file, of course
that should be flushed to disk; however, I don't want writes at any other time,
such as rewriting the superblock every 30 seconds. Is there some way I can do
In an older instance of this system, the disk was mounted read-only; I'd mount
it read-write to updated it, flush the buffer cache, then remount it read-only.
On 5.0 and later, however (and as has been discussed ad nauseum), that is no
longer supported. The next possibility is to have some way to mount the file
system so there are no such writes. Specifying noatime will certainly help --
but is that enough? (Log files and such use tmpfs, so they're not a problem.)
I've also thought about mounting /var/db as a FAT file system -- would that do
the trick? Any other suggestions?
--Steve Bellovin, http://www.cs.columbia.edu/~smb
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