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1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 8.11451 s, 132 MB/s hdparm -tT /dev/vda /dev/vda: Timing cached reads: 25106 MB in 2.00 seconds = 12568.51 MB/sec Timing buffered disk reads: 496 MB in 3.02 seconds = 164.16 MB/sec

hdparm -tT /dev/vda Timing cached reads: 8926 MB in 2.00 seconds = 4468.52 MB/sec Timing buffered disk reads: 542 MB in 3.00 seconds = 180.43 MB/sec dd bs=1M count=1024 if=/dev/zero of=test conv=fdatasync 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 32.0005 s, 33.6 MB/s

I'm not sure how good is the test as it depends on the IO levels of the host where the VM instance is running.

This is a 1GB Debian Wheezy instance with regular HDD in Memset [1]:

    dd bs=1M count=1024 if=/dev/zero of=test conv=fdatasync
    1024+0 records in
    1024+0 records out
    1073741824 bytes (1.1 GB) copied, 17.7142 s, 60.6 MB/s

I checked the host and its load is average. DO's 33.6 MB/s sounds poor.

[1] disclaimer: Memset hosting is my employer, I built some of this; but this is an honest test (personal VM running several services).

EDIT: formatting

EDIT 2: same test on a VM with SSD disk:

    dd bs=1M count=1024 if=/dev/zero of=test conv=fdatasync
    1024+0 records in
    1024+0 records out
    1073741824 bytes (1.1 GB) copied, 3.48953 s, 308 MB/s

Again, the host has average load.