Add partition to existing disk

[Jerry McAllister]

Hi,

> I have an existing system which I cannot reinstall and sysinstall seems like
> too much of a wizard to use on a well running existing system.  When I built
> the system 2 years ago I decided to leave about 25GB of unpartitioned space
> for future unknown projects, I now have a use for the space but I can't for
> the life of me figure out exactly what steps are needed to use the space.
> 
> The system is configured as follows:
> Dell PE 2650 with 3x36GB drives in a Hardware RAID 5 on a PERC controller
> 4.11-STABLE
> 
> And the currect disklabel is:
> #disklabel aacd0s1
> # /dev/aacd0s1c:
> type: ESDI
> disk: aacd0s1
> label:
> flags:
> bytes/sector: 512
> sectors/track: 63
> tracks/cylinder: 255
> sectors/cylinder: 16065
> cylinders: 8849
> sectors/unit: 142175187
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0           # milliseconds
> track-to-track seek: 0  # milliseconds
> drivedata: 0
> 
> 8 partitions:
> #        size   offset    fstype   [fsize bsize bps/cpg]
>   a:  4096000        0    4.2BSD     2048 16384    90   # (Cyl.    0 - 254*)
>   b:  3072000  4096000      swap                        # (Cyl.  254*- 446*)
>   c: 142175187        0    unused        0     0        # (Cyl.    0 -
> 8849*)
>   e: 12288000  7168000    4.2BSD     2048 16384    89   # (Cyl.  446*-
> 1211*)
>   f:  4096000 19456000    4.2BSD     2048 16384    90   # (Cyl. 1211*-
> 1466*)
>   g: 61440000 23552000    4.2BSD     2048 16384    89   # (Cyl. 1466*-
> 5290*)
> 
> As you can see I have space available from 84992000 through 142175187.  I
> have done similar things in Solaris and other OS's but I'm just not sure
> exactly what the FreeBSD steps are to utilize this space.
> 
> Any pointers are appreciated.

Go to single user mode.
do:
    fsck -p            (shouldn't be needed, but just in case)
    mount -u /
    mount -a
    swapon -a

run disklabel -e on the drive
    disklabel -e [-r] aacd0s1

Add the following line in the edit file it gives you.


  h: *   *   4.2BSD   2048   16384   89

(I am not sure about that 89 for bps/cpg.  Just use what it wants to)

Write and quit the edit session.

Then to an newfs on the /dev/aacds1h partition

   newfs -b 16384 -f 2048 -i 2048 /dev/raacd0s1h

  (You could just take the defaults for the newfs, but I like to specify
  block and frag the same as in the disklabel and the -i causes it to
  make more inodes which I seem to need on larger file systems)

Add a mount point for it however you want, for example
    mkdir /work

add a line to your /etc/fstab

/dev/ad0s3h      /work     ufs     rw      2       2

Substitute your own mount point if you created one with a different name.

Type mount -a    and voila, you have it.

You might have to run an fsck on it.
> 
> 
> Thanks,
> Scott
> 
> 
> 
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