What does it mean? What do I do about it?
ioResponse is a measure of random disk read response time.
- 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. Upgrade your IO subsystem. If you are using SAN storage, consider moving to internal disks.