ccd recipe for extending a filesystem

[David Muir Sharnoff]

Hi.  I've come up with a recipe to grow a filesystem.  I would
like to do several things here:

	1.  Share the recipe so others can use it
	2.  Have someone verify my recipe -- I think it works, but
	    another set of eyes would help
	3.  Ask if anyone knows a reason this won't work.

Anyway... 

This is not for those who want clean systems or make mistakes when
typing...  To make a filesystem bigger (I'm assuming a normal
filesystem here) like /foobar mounted on /dev/sd3d....
       
    1. make two new partitions. The first should be 32 blocks long (call
       it /dev/sd4e). The second should be the new space you want for
       your filesystem (16 blocks will be overhead) (call it /dev/sd4f)
       # disklabel -e sd4
    2. zero the new small partion
       # dd if=/dev/zero of=/dev/sd4e
    3. unmount the filesystem
    4. capture the first 16 blocks of the filesystem:
       # dd if=/dev/sd3d of=/root/x count=16
    5. make a ccd partition that spans the three partitions:
       # ccdconfg -c ccd2 0 none /dev/sd4e /dev/sd3d /dev/sd4f
       # disklabel -r -w ccd2c auto
       # disklabel ccd2c
    6. back up the new disklabel
       # disklabel ccd2c > /root/y
    7. restore the captured 16 blocks:
       # dd if=/root/x of=/dev/ccd2c
    8. unfortunantly the last command clobbered the disk label. restore
       it:
       # disklabel -R -r ccd2c /root/y
       # disklabel ccd2c
    9. fsck & mount the partition to make sure it's okay
   10. # ccdconfig -g > /etc/ccd.conf
   11. change /etc/fstab: /dev/sd3d becomes /dev/ccd2c
   12. unmount the partition
   13. use growfs to expandit
   14. fsck & mount the partition to make sure it's okay

   I think making a backup first might be a good idea :-)

   If you are trying to grow a ccd partion that is set up like what you
   get after following the above instructions, it's eaiser but not as
   much easier as you might expect.

    1. make the new partion for the addtional space (remember 16 blocks
       will be overhead). call it /dev/sd5h.
       # disklabel -e sd5
    2. unmount the filesystem
    3. capture the first 16 blocks of the filesystem:
       # dd if=/dev/ccd2c of=/root/x count=16
    4. zero the original small partion
       # dd if=/dev/zero of=/dev/sd4e
    5. make a ccd partition that spans all the partitions:
       # ccdconfg -c ccd2 0 none /dev/sd4e /dev/sd3d /dev/sd4f /dev/sd5h
       # disklabel -r -w ccd2c auto
       # disklabel ccd2c
    6. back up the new disklabel
       # disklabel ccd2c > /root/y
    7. restore the captured 16 blocks:
       # dd if=/root/x of=/dev/ccd2c
    8. unfortunantly the last command clobbered the disk label. restore
       it:  
       # disklabel -R -r ccd2c /root/y
       # disklabel ccd2c
    9. fsck & mount the partition to make sure it's okay
   10. ccdconfig -g > /etc/ccd.conf
   11. unmount the partition
   12. use growfs to expandit
   13. fsck & mount the partition to make sure it's okay

-Dave