E2 Instance With Local Storage?

Question

Hi,

I browsed through types of instances and I noticed that c3.large has a SSD instead of EBS.
Hence, I believe the instance has a local drive attached.
And then I configured the "Instance store volumes" in EC2>Instances>Launch an instance: device name=/dev/sdb for volume 2 and /dev/sdc for volume 2.
However, after I launched the instance and I didn't see /dev/sdb and /dev/sdc:
$ ll /dev/
total 0
crw-r--r--. 1 root root     10, 235 Apr 28 12:18 autofs
drwxr-xr-x. 2 root root         180 Apr 28 12:18 block
drwxr-xr-x. 2 root root        2400 Apr 28 12:18 char
crw--w----. 1 root tty       5,   1 Apr 28 12:19 console
lrwxrwxrwx. 1 root root          11 Apr 28 12:18 core -> /proc/kcore
drwxr-xr-x. 4 root root          80 Apr 28 12:18 cpu
crw-------. 1 root root     10, 123 Apr 28 12:18 cpu_dma_latency
drwxr-xr-x. 6 root root         120 Apr 28 12:18 disk
drwxr-xr-x. 2 root root          60 Apr 28 12:18 dma_heap
drwxr-xr-x. 3 root root          80 Apr 28 12:18 dri
crw-rw----. 1 root video    29,   0 Apr 28 12:18 fb0
lrwxrwxrwx. 1 root root          13 Apr 28 12:18 fd -> /proc/self/fd
crw-rw-rw-. 1 root root      1,   7 Apr 28 12:18 full
crw-rw-rw-. 1 root root     10, 229 Apr 28 12:18 fuse
crw-------. 1 root root     10, 228 Apr 28 12:18 hpet
drwxr-xr-x. 2 root root           0 Apr 28 12:18 hugepages
crw-------. 1 root root     10, 183 Apr 28 12:18 hwrng
lrwxrwxrwx. 1 root root          12 Apr 28 12:18 initctl -> /run/initctl
drwxr-xr-x. 3 root root         200 Apr 28 12:18 input
crw-r--r--. 1 root root      1,  11 Apr 28 12:18 kmsg
lrwxrwxrwx. 1 root root          28 Apr 28 12:18 log -> /run/systemd/journal/dev-log
crw-rw----. 1 root disk     10, 237 Apr 28 12:18 loop-control
drwxr-xr-x. 2 root root          60 Apr 28 12:18 mapper
crw-------. 1 root root     10, 227 Apr 28 12:18 mcelog
crw-r-----. 1 root kmem      1,   1 Apr 28 12:18 mem
drwxrwxrwt. 2 root root          40 Apr 28 12:18 mqueue
drwxr-xr-x. 2 root root          60 Apr 28 12:18 net
crw-rw-rw-. 1 root root      1,   3 Apr 28 12:18 null
crw-------. 1 root root     10, 144 Apr 28 12:18 nvram
crw-r-----. 1 root kmem      1,   4 Apr 28 12:18 port
crw-------. 1 root root    108,   0 Apr 28 12:18 ppp
crw-rw-rw-. 1 root tty       5,   2 Apr 28 12:26 ptmx
drwxr-xr-x. 2 root root           0 Apr 28 12:18 pts
crw-rw-rw-. 1 root root      1,   8 Apr 28 12:18 random
crw-rw-r--. 1 root root     10, 242 Apr 28 12:18 rfkill
lrwxrwxrwx. 1 root root           4 Apr 28 12:18 rtc -> rtc0
crw-------. 1 root root    250,   0 Apr 28 12:18 rtc0
drwxrwxrwt. 2 root root          40 Apr 28 12:18 shm
crw-------. 1 root root     10, 231 Apr 28 12:18 snapshot
drwxr-xr-x. 2 root root          80 Apr 28 12:18 snd
lrwxrwxrwx. 1 root root          15 Apr 28 12:18 stderr -> /proc/self/fd/2
lrwxrwxrwx. 1 root root          15 Apr 28 12:18 stdin -> /proc/self/fd/0
lrwxrwxrwx. 1 root root          15 Apr 28 12:18 stdout -> /proc/self/fd/1
crw-rw-rw-. 1 root tty       5,   0 Apr 28 12:18 tty
crw--w----. 1 root tty       4,   0 Apr 28 12:18 tty0
crw--w----. 1 root tty       4,   1 Apr 28 12:19 tty1
crw--w----. 1 root tty       4,  10 Apr 28 12:18 tty10
crw--w----. 1 root tty       4,  11 Apr 28 12:18 tty11
crw--w----. 1 root tty       4,  12 Apr 28 12:18 tty12
crw--w----. 1 root tty       4,  13 Apr 28 12:18 tty13
crw--w----. 1 root tty       4,  14 Apr 28 12:18 tty14
crw--w----. 1 root tty       4,  15 Apr 28 12:18 tty15
crw--w----. 1 root tty       4,  16 Apr 28 12:18 tty16
crw--w----. 1 root tty       4,  17 Apr 28 12:18 tty17
crw--w----. 1 root tty       4,  18 Apr 28 12:18 tty18
crw--w----. 1 root tty       4,  19 Apr 28 12:18 tty19
crw--w----. 1 root tty       4,   2 Apr 28 12:18 tty2
crw--w----. 1 root tty       4,  20 Apr 28 12:18 tty20
crw--w----. 1 root tty       4,  21 Apr 28 12:18 tty21
crw--w----. 1 root tty       4,  22 Apr 28 12:18 tty22
crw--w----. 1 root tty       4,  23 Apr 28 12:18 tty23
crw--w----. 1 root tty       4,  24 Apr 28 12:18 tty24
crw--w----. 1 root tty       4,  25 Apr 28 12:18 tty25
crw--w----. 1 root tty       4,  26 Apr 28 12:18 tty26
crw--w----. 1 root tty       4,  27 Apr 28 12:18 tty27
crw--w----. 1 root tty       4,  28 Apr 28 12:18 tty28
crw--w----. 1 root tty       4,  29 Apr 28 12:18 tty29
crw--w----. 1 root tty       4,   3 Apr 28 12:18 tty3
crw--w----. 1 root tty       4,  30 Apr 28 12:18 tty30
crw--w----. 1 root tty       4,  31 Apr 28 12:18 tty31
crw--w----. 1 root tty       4,  32 Apr 28 12:18 tty32
crw--w----. 1 root tty       4,  33 Apr 28 12:18 tty33
crw--w----. 1 root tty       4,  34 Apr 28 12:18 tty34
crw--w----. 1 root tty       4,  35 Apr 28 12:18 tty35
crw--w----. 1 root tty       4,  36 Apr 28 12:18 tty36
crw--w----. 1 root tty       4,  37 Apr 28 12:18 tty37
crw--w----. 1 root tty       4,  38 Apr 28 12:18 tty38
crw--w----. 1 root tty       4,  39 Apr 28 12:18 tty39
crw--w----. 1 root tty       4,   4 Apr 28 12:18 tty4
crw--w----. 1 root tty       4,  40 Apr 28 12:18 tty40
crw--w----. 1 root tty       4,  41 Apr 28 12:18 tty41
crw--w----. 1 root tty       4,  42 Apr 28 12:18 tty42
crw--w----. 1 root tty       4,  43 Apr 28 12:18 tty43
crw--w----. 1 root tty       4,  44 Apr 28 12:18 tty44
crw--w----. 1 root tty       4,  45 Apr 28 12:18 tty45
crw--w----. 1 root tty       4,  46 Apr 28 12:18 tty46
crw--w----. 1 root tty       4,  47 Apr 28 12:18 tty47
crw--w----. 1 root tty       4,  48 Apr 28 12:18 tty48
crw--w----. 1 root tty       4,  49 Apr 28 12:18 tty49
crw--w----. 1 root tty       4,   5 Apr 28 12:18 tty5
crw--w----. 1 root tty       4,  50 Apr 28 12:18 tty50
crw--w----. 1 root tty       4,  51 Apr 28 12:18 tty51
crw--w----. 1 root tty       4,  52 Apr 28 12:18 tty52
crw--w----. 1 root tty       4,  53 Apr 28 12:18 tty53
crw--w----. 1 root tty       4,  54 Apr 28 12:18 tty54
crw--w----. 1 root tty       4,  55 Apr 28 12:18 tty55
crw--w----. 1 root tty       4,  56 Apr 28 12:18 tty56
crw--w----. 1 root tty       4,  57 Apr 28 12:18 tty57
crw--w----. 1 root tty       4,  58 Apr 28 12:18 tty58
crw--w----. 1 root tty       4,  59 Apr 28 12:18 tty59
crw--w----. 1 root tty       4,   6 Apr 28 12:18 tty6
crw--w----. 1 root tty       4,  60 Apr 28 12:18 tty60
crw--w----. 1 root tty       4,  61 Apr 28 12:18 tty61
crw--w----. 1 root tty       4,  62 Apr 28 12:18 tty62
crw--w----. 1 root tty       4,  63 Apr 28 12:18 tty63
crw--w----. 1 root tty       4,   7 Apr 28 12:18 tty7
crw--w----. 1 root tty       4,   8 Apr 28 12:18 tty8
crw--w----. 1 root tty       4,   9 Apr 28 12:18 tty9
crw-rw----. 1 root dialout   4,  64 Apr 28 12:19 ttyS0
crw-rw----. 1 root dialout   4,  65 Apr 28 12:18 ttyS1
crw-rw----. 1 root dialout   4,  66 Apr 28 12:18 ttyS2
crw-rw----. 1 root dialout   4,  67 Apr 28 12:18 ttyS3
crw-rw----. 1 root kvm      10, 124 Apr 28 12:18 udmabuf
crw-------. 1 root root     10, 239 Apr 28 12:18 uhid
crw-------. 1 root root     10, 223 Apr 28 12:18 uinput
crw-rw-rw-. 1 root root      1,   9 Apr 28 12:18 urandom
crw-------. 1 root root    244,   0 Apr 28 12:18 usbmon0
crw-------. 1 root root     10, 126 Apr 28 12:18 userfaultfd
crw-rw----. 1 root tty       7,   0 Apr 28 12:18 vcs
crw-rw----. 1 root tty       7,   1 Apr 28 12:18 vcs1
crw-rw----. 1 root tty       7,   6 Apr 28 12:18 vcs6
crw-rw----. 1 root tty       7, 128 Apr 28 12:18 vcsa
crw-rw----. 1 root tty       7, 129 Apr 28 12:18 vcsa1
crw-rw----. 1 root tty       7, 134 Apr 28 12:18 vcsa6
crw-rw----. 1 root tty       7,  64 Apr 28 12:18 vcsu
crw-rw----. 1 root tty       7,  65 Apr 28 12:18 vcsu1
crw-rw----. 1 root tty       7,  70 Apr 28 12:18 vcsu6
drwxr-xr-x. 2 root root          60 Apr 28 12:18 vfio
crw-------. 1 root root     10, 127 Apr 28 12:18 vga_arbiter
crw-------. 1 root root     10, 137 Apr 28 12:18 vhci
crw-rw-rw-. 1 root kvm      10, 238 Apr 28 12:18 vhost-net
crw-rw-rw-. 1 root kvm      10, 241 Apr 28 12:18 vhost-vsock
drwxr-xr-x. 2 root root          60 Apr 28 12:18 xen
brw-rw----. 1 root disk    202,   0 Apr 28 12:18 xvda
brw-rw----. 1 root disk    202,   1 Apr 28 12:18 xvda1
brw-rw----. 1 root disk    202,   2 Apr 28 12:18 xvda2
brw-rw----. 1 root disk    202,   3 Apr 28 12:18 xvda3
brw-rw----. 1 root disk    202,   4 Apr 28 12:18 xvda4
brw-rw----. 1 root disk    202,  16 Apr 28 12:18 xvdb
brw-rw----. 1 root disk    202,  32 Apr 28 12:18 xvdc
crw-rw-rw-. 1 root root      1,   5 Apr 28 12:18 zero

Why?

re:Post Agent · Answer

The reason you're not seeing /dev/sdb and /dev/sdc is because EC2 instances with instance store volumes typically use different device names than what you specified. In your case, the instance store volumes are likely appearing as /dev/xvdb and /dev/xvdc.

From the output you provided, we can see that these devices are indeed present:

brw-rw----. 1 root disk    202,  16 Apr 28 12:18 xvdb
brw-rw----. 1 root disk    202,  32 Apr 28 12:18 xvdc

These xvdb and xvdc devices correspond to the instance store volumes you configured. The "xv" prefix stands for "Xen virtual," which is the virtualization technology used by some EC2 instance types.

It's important to note that the device names you specify when launching an instance (like /dev/sdb and /dev/sdc) are often mapped to different device names within the instance's operating system. This mapping can vary depending on the instance type, virtualization method, and the AMI used.

To use these instance store volumes, you would need to mount them just as you would any other block device. Keep in mind that instance store volumes are ephemeral, meaning the data on them persists only for the life of the associated EC2 instance. If the instance stops, terminates, or fails, the data on instance store volumes is lost.  
**Sources**  
[Amazon EBS volumes - Amazon EBS](https://docs.aws.amazon.com/ebs/latest/userguide/ebs-volumes.html)  
[Community | Connect to an Amazon EC2 Mac instance](https://community.aws/content/2duUtYq4ENzOLGLdEg0A3aeyCuj/ec2-mac-02-connect-to-an-ec2-mac-instance)

E2 Instance With Local Storage?

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