COMPACT FLASH LINUX STRATEGY

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OVERVIEW
    /varcp is a normal directory that just holds a normal backup of /var.
    This is what is loaded into the production RAM /var at boot time.

    At bootup, we mount RAM partition /tmpfsvar, load it with a copy
    of the /varcp branch, then overmount /var with /tmpfsvar.

    The normal /var branch on the root disk will contain updates only
    from bootups before the overmounts.
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No swap space.  (Will Suse install permit?)

Just / and /boot partitions on both primary and backup flash disks.

Make 2 RAM partitions (from fstab:)
    none  /tmpfsvar  tmpfs    noauto,size=20M  0  0
    none  /tmp       tmpfs    size=5M          0  0
The latter is handled 100% automatically.  The former requires care.

For RH, edit /etc/rc.d/rc.sysinit right after "mount -f /proc" to add:
    action $"Loading /tmpfsvar:" mount /tmpfsvar &&
    cd /varcp && find . -depth -print | cpio -pdVm /tmpfsvar &&
    action $"Overmounting /var:" mount --bind /tmpfsvar /var
(Looks like for Suse, I would edit /etc/rc.d/boot.localfs right after
"mount... /dev/shm":
    echo 'Loading /tmpfsvar:'
    mount /tmpfsvar &&
    cd /varcp && find . -depth -print | cpio -pdVm /tmpfsvar &&
    echo 'Overmounting /var:' && mount --bind /tmpfsvar /var


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TODO:  Make sure that perf initialization occurs AFTER the remount.
TODO:  Immediately before /tmpfsvar load, rsync /var/log/ to /earlylog.

Add to /etc/init.d/halt:
    runcmd $"Saving contents of /var to NV memory" rsync -avH /var/ /varcp
SUSE:  Put it in halt.local.

CRONJOBS
    Sync RAM to production flash disk like every 5 minutes
        rsync -avH /var/ /varcp > /dev/null
    Sync to backup flash disk daily
        /usr/local/bin/syncflash -l

CF<-->IDE converters
    Drive is only recognized about 50% of bootups when 2 drivers are done this 
     way.  I am testing now whether it is more reliable with just 1 CF drive.
    Legacy 40-conductor cables seem to work better than Ultra cables.
    SATA (mb/adapt) -> SATA<-->IDE-convert -> IDE<-->CF-converter does not work.
     (Linux can't see the driver).