Two weeks ago, I wrote about The Data Center in the Age of Abundance and claimed that IOPS are – among other things – a solved problem.
What does a solved problem look like? Here is a benchmark running 100k random writes of 4K per second, with zero Jitter, at 350µs end-to-end write latency across six switches.
Databases really like reliably timed writes like these.
Maximum queue depth would be 48, the system is not touching that.
and here is iostat on the iSCSI client running the test
100k random writes, 4k write size, inside a 2 TB linux file of random data, on a 15 TB filesystem with XFS, on an LVM2 volume provided by iSCSI over a single 10 GBit/s interface, with six switch hops between the linux client and the array.