IO performance rules
IO Rules of Thumb
- %b
- < 5% => no worries
- > 30% => problem
- svc_t
- if %b < 5%, ignore
- 10-50 ms okay
- 50-1500 ms is a problem (longer latency)
- direct effect on user response time
- %w
- 0% - SCSI bus probably clear
- 0-5% - bus busy
- > 5% - SCSI bus very busy