Why does Linux say my Linode's drives are HDD?
This is a consequence of virtual hosting. Our hosts divvy up resources using KVM, which creates virtual drives that Linodes utilize. I checked my own Linode and can see the disks are of model
> cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: QEMU Model: QEMU HARDDISK Rev: 2.5+ Type: Direct-Access ANSI SCSI revision: 05 Host: scsi0 Channel: 00 Id: 01 Lun: 02 Vendor: QEMU Model: QEMU HARDDISK Rev: 2.5+ Type: Direct-Access ANSI SCSI revision: 05
If you want to confirm without a doubt that your Linode is powered by SSDs, use
dd to test the write speed. Try the following command, with which I've included my own output (the sync command is used to clear the cache before testing):
$ sync; dd if=/dev/zero of=speedtest.txt bs=1M count=1024; rm speedtest.txt 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 1.12886 s, 951 MB/s