syncIOMB x >= or < y

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

Measures the time to create a 100MB file without buffered writes. Transaction notes are written to disk synchronously and poor synchronous IO performance will be reflected in poor transaction throughput.

< 10 - Performance is inexcusably bad. Replace this IO subsystem immediately

< 20 - Performance is barely acceptable.

< 50 - Performance is "ok" if the system is not very demanding.

>= 50 - Performance is excellent.

Poor synchronous IO is an inherent characteristic of RAID5, RAID6, SAN, NAS and similar configurations.