How do you deal pre-warming the disks before running a benchmark like this? I was recently doing some benchmarks on an AWS I2 instance type, and while doing res

How do you deal pre-warming the disks before running a benchmark like this? I was recently doing some benchmarks on an AWS I2 instance type, and while doing research, I came upon AWS's "Optimizing Disk Performance" [1] page, where they suggest you pre-warm the disks (note: I2 is the only instance type that is exempt). Because of the way that Amazon EC2 virtualizes disks, the first write to any location on a standard instance store volume performs more slowly than subsequent writes. For most applications, amortizing this cost over the lifetime of the instance is acceptable. However, if you require high disk performance, we recommend that you pre-warm your drives by writing once to every drive location before production use. Do you write to the disks before your benchmarks? Do you have any notes on how long it takes, etc? [1] http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceStorage.html#disk-performance http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceS...