hard drive size on a RAID1 array

Hi all,

I have two 500 GB hard drives that are configured in a raid 1 array.
They are partitioned into two: a 20gb partition and a 480gb partition
(with 2gb of swap).

My problem is as follows:

When I do df -h I get the following:
Filesystem Size Used Avail Use% Mounted on
/dev/md0 19G 9.8G 7.8G 56% /
varrun 1013M 128K 1013M 1% /var/run
varlock 1013M 0 1013M 0% /var/lock
udev 1013M 80K 1013M 1% /dev
devshm 1013M 0 1013M 0% /dev/shm
lrm 1013M 34M 979M 4% /lib/modules/2.6.22-14-
generic/volatile

Where is my other partition??

I tried using fdisk (but I don't really know how to use it that well)
And I print the following:

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 60557 486424071 fd Linux raid
autodetect
/dev/sdb2 60558 60801 1959930 fd Linux raid
autodetect

Device Boot Start End Blocks Id System
/dev/sda1 * 1 60557 486424071 fd Linux raid
autodetect
/dev/sda2 60558 60801 1959930 fd Linux raid
autodetect



Further information:

$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/md0
UUID=3130e988-88a8-4e87-8b85-7a267904a370 / ext3
defaults,errors=remount-ro 0 1
# /dev/md1
UUID=8e35bf5c-6501-49fa-960e-ac3f589ffa1b none swap
sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec 0 0

$ swapon -s
Filename Type Size
Used Priority
/dev/md1 partition 1959800
34756 -1

$ free
total used free shared buffers
cached
Mem: 2074372 1124088 950284 0 80548
909980
-/+ buffers/cache: 133560 1940812
Swap: 1959800 34756 1925044

$ lsmod
Module Size Used by
af_packet 24840 2
vmnet 39092 13
vmmon 1825708 8
rfcomm 42136 2
l2cap 26240 11 rfcomm
bluetooth 57060 4 rfcomm,l2cap
ppdev 10244 0
ipv6 273892 14
acpi_cpufreq 10568 1
cpufreq_stats 7232 0
cpufreq_ondemand 9612 1
cpufreq_conservative 8072 0
freq_table 5792 3
acpi_cpufreq,cpufreq_stats,cpufreq_ondemand
cpufreq_userspace 5280 0
cpufreq_powersave 2688 0
sbs 19592 0
video 18060 0
ac 6148 0
button 8976 0
container 5504 0
dock 10656 0
battery 11012 0
lp 12580 0
loop 19076 0
psmouse 39952 0
parport_pc 37412 1
parport 37448 3 ppdev,lp,parport_pc
pcspkr 4224 0
shpchp 34580 0
pci_hotplug 32704 1 shpchp
evdev 11136 2
ext3 133896 1
jbd 60456 1 ext3
mbcache 9732 1 ext3
sg 36764 0
sr_mod 17828 1
cdrom 37536 1 sr_mod
sd_mod 30336 6
usbhid 29536 0
hid 28928 1 usbhid
ata_generic 8452 0
floppy 60004 0
ahci 23300 4
pata_it8213 9348 1
e1000 126272 0
libata 125168 3 ata_generic,ahci,pata_it8213
scsi_mod 147084 4 sg,sr_mod,sd_mod,libata
ehci_hcd 36492 0
uhci_hcd 26640 0
usbcore 138632 4 usbhid,ehci_hcd,uhci_hcd
raid10 26496 0
raid456 128016 0
xor 16904 1 raid456
raid1 25984 2
raid0 9728 0
multipath 9984 0
linear 7552 0
md_mod 82324 9
raid10,raid456,raid1,raid0,multipath,linear
thermal 14344 0
processor 32072 2 acpi_cpufreq,thermal
fan 5764 0
fuse 47124 1
apparmor 40728 0
commoncap 8320 1 apparmor

$ du -h --max-depth=1 /
156M /lib
4.0K /srv
4.0K /opt
236K /dev
4.7M /bin
12K /media
0 /sys
40K /root
4.0K /initrd
0 /proc
7.9M /home
9.5M /etc
322M /var
2.1G /usr
18M /boot
16K /lost+found
6.4M /sbin
20K /tmp
4.0K /mnt
2.6G /

$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid1 sda2[0] sdb2[1]
1959808 blocks [2/2] [UU]

md0 : active raid1 sda1[0] sdb1[1]
486424000 blocks [2/2] [UU]

unused devices: <none>

Very strange is the following:

# mount /dev/md0
mount: /dev/md0 already mounted or / busy
mount: according to mtab, /dev/md0 is already mounted on /

# mount /dev/md1
mount: mount point none does not exist
(must be swap?)

# fdisk /dev/md1
p

Warning: invalid flag 0x0000 of partition table 4 will be corrected by
w(rite)

Command (m for help): p

Disk /dev/md1: 2006 MB, 2006843392 bytes
2 heads, 4 sectors/track, 489952 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0xd436a49e

Device Boot Start End Blocks Id System

# fdisk /dev/md0
p
Warning: invalid flag 0x0000 of partition table 4 will be corrected by
w(rite)

Command (m for help): p

Disk /dev/md0: 498.0 GB, 498098176000 bytes
2 heads, 4 sectors/track, 121606000 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0xfe9d38d6

Device Boot Start End Blocks Id System

So, according to this, / should be 498 GB..
But it's only 20..

Any ideas?
.