ioResponse x < or >= y

What does it mean? What do I do about it?

ioResponse is a measure of random disk read response time.

Upgrade your IO subsystem. If you are using SAN storage, consider moving to internal disks.

  • Less than 1ms is very good and probably indicates the use of internal SSD.
  • 1ms to 3ms is probably traditional internal disks.
  • 5ms to 10ms is likely a well tuned SAN.
  • Anything in excess of 10ms is a very poorly performing IO subsystem and is likely to be some sort of external SAN or NAS.