Mounting extra disks on ec2 instances

First, compare available partitions with

 ~>  cat /proc/partitions
major minor  #blocks  name
   8    16  440366080 sdb
   8    32  440366080 sdc
   8    48  440366080 sdd
   8    64  440366080 sde
   8     1   10485760 sda1
~>  df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             9.9G  1.6G  7.9G  17% /
/dev/sdb              414G  199M  393G   1% /mnt
none                  3.6G     0  3.6G   0% /dev/shm

Here we note that /dev/sda1 and /dev/sdb are in use, while /dev/sdc /dev/sdd and /dev/sde are not yet in use

We want to check the fstab to see what the disktypes are. Also edit this file if you want your mounted disk to come back up on a reboot! (In Ec2-land all of these filesystems are non-persistent, so if your machine more than reboots, you'll lose the data entirely.

 ~>  more /etc/fstab
/dev/sda1               /                       ext3    defaults 1 1
/dev/sdb               /mnt                     ext3    defaults 0 0
none                    /dev/pts                devpts  gid=5,mode=620 0 0
none                    /dev/shm                tmpfs   defaults 0 0
none                    /proc                   proc    defaults 0 0
none                    /sys                    sysfs   defaults 0 0

Create your mount point:

 ~>  mkdir /mnt2

Mount the disk:

 ~>  mount -t ext3 /dev/sdc /mnt2

And check its availability:

 ~>  df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             9.9G  1.6G  7.9G  17% /
/dev/sdb              414G  199M  393G   1% /mnt
none                  3.6G     0  3.6G   0% /dev/shm
/dev/sdc              414G  199M  393G   1% /mnt2