EC2 disks all identified as SSD.

[smoser]

On an EC2 instance, disko identifies both SSD and HDD as SSD.

Here is an example, from a c1.medium:

• xvda is an 8GiB volume type gp2
• xvdc is a swap volume
• xvdd is a instance store (ephemeral0)
• xvdf is a 1GiB volume type standard

Block device mappings are:

$ u=http://169.254.169.254/latest/meta-data/block-device-mapping/; 
$ for x in $(curl --silent $u); do echo $x=$(curl --silent $u/$x); done
ami=/dev/sda1
ephemeral0=sdd
root=/dev/sda1
swap=sdc


$ ./demo/demo disk scan
{
 "xvda": {
 "name": "xvda",
 "path": "/dev/xvda",
 "size": 8589934592,
 "sectorSize": 512,
 "type": "SSD",
 "attachment": "UNKNOWN",
 "partitions": {
 "1": {
 "start": 1048576,
 "last": 8589917695,
 "id": "00000000-0000-0000-0000-000000000000",
 "type": "00000000-0000-0000-0000-000000000083",
 "name": "",
 "number": 1
 }
 },
 "table": "MBR",
 "udevInfo": {
 "name": "xvda",
 "sysPath": "/devices/vbd-768/block/xvda",
 "symLinks": null,
 "properties": {
 "DEVNAME": "/dev/xvda",
 "DEVPATH": "/devices/vbd-768/block/xvda",
 "DEVTYPE": "disk",
 "ID_PART_TABLE_TYPE": "dos",
 "ID_PART_TABLE_UUID": "fe3a9f65",
 "MAJOR": "202",
 "MINOR": "0",
 "SUBSYSTEM": "block",
 "TAGS": ":systemd:",
 "USEC_INITIALIZED": "2944484"
 }
 }
 },
 "xvdc": {
 "name": "xvdc",
 "path": "/dev/xvdc",
 "size": 939524096,
 "sectorSize": 512,
 "type": "SSD",
 "attachment": "UNKNOWN",
 "partitions": {},
 "table": "NONE",
 "udevInfo": {
 "name": "xvdc",
 "sysPath": "/devices/vbd-51744/block/xvdc",
 "symLinks": [
 "disk/by-uuid/3875a330-8e81-4db6-9319-7c1dbe5deff0"
 ],
 "properties": {
 "DEVLINKS": "/dev/disk/by-uuid/3875a330-8e81-4db6-9319-7c1dbe5deff0",
 "DEVNAME": "/dev/xvdc",
 "DEVPATH": "/devices/vbd-51744/block/xvdc",
 "DEVTYPE": "disk",
 "ID_FS_TYPE": "swap",
 "ID_FS_USAGE": "other",
 "ID_FS_UUID": "3875a330-8e81-4db6-9319-7c1dbe5deff0",
 "ID_FS_UUID_ENC": "3875a330-8e81-4db6-9319-7c1dbe5deff0",
 "ID_FS_VERSION": "1",
 "MAJOR": "202",
 "MINOR": "32",
 "SUBSYSTEM": "block",
 "TAGS": ":systemd:",
 "USEC_INITIALIZED": "3153128"
 }
 }
 },
 "xvdd": {
 "name": "xvdd",
 "path": "/dev/xvdd",
 "size": 365041287168,
 "sectorSize": 512,
 "type": "SSD",
 "attachment": "UNKNOWN",
 "partitions": {},
 "table": "NONE",
 "udevInfo": {
 "name": "xvdd",
 "sysPath": "/devices/vbd-51760/block/xvdd",
 "symLinks": [
 "disk/by-uuid/8875aa95-01ad-4133-a2ae-237f49b13a8c"
 ],
 "properties": {
 "DEVLINKS": "/dev/disk/by-uuid/8875aa95-01ad-4133-a2ae-237f49b13a8c",
 "DEVNAME": "/dev/xvdd",
 "DEVPATH": "/devices/vbd-51760/block/xvdd",
 "DEVTYPE": "disk",
 "ID_FS_TYPE": "ext3",
 "ID_FS_USAGE": "filesystem",
 "ID_FS_UUID": "8875aa95-01ad-4133-a2ae-237f49b13a8c",
 "ID_FS_UUID_ENC": "8875aa95-01ad-4133-a2ae-237f49b13a8c",
 "ID_FS_VERSION": "1.0",
 "MAJOR": "202",
 "MINOR": "48",
 "SUBSYSTEM": "block",
 "TAGS": ":systemd:",
 "USEC_INITIALIZED": "2941507"
 }
 }
 },
 "xvdf": {
 "name": "xvdf",
 "path": "/dev/xvdf",
 "size": 1073741824,
 "sectorSize": 512,
 "type": "SSD",
 "attachment": "UNKNOWN",
 "partitions": {},
 "table": "NONE",
 "udevInfo": {
 "name": "xvdf",
 "sysPath": "/devices/vbd-51792/block/xvdf",
 "symLinks": null,
 "properties": {
 "DEVNAME": "/dev/xvdf",
 "DEVPATH": "/devices/vbd-51792/block/xvdf",
 "DEVTYPE": "disk",
 "MAJOR": "202",
 "MINOR": "80",
 "SUBSYSTEM": "block",
 "TAGS": ":systemd:",
 "USEC_INITIALIZED": "2085116822"
 }
 }
 }
}

[smoser]

I just put up #79 which will identify the xen blkfront devices as XENBUS attachment.

The SSD issue is tricky, as we determine if something is an SSD based on SysPath /queue/rotational and all EC2 devices list a 0 there.