More information on unusual activity on automatic synchronisation. I was watching the Resource Monitor carefully as the "Creating" state went through all of the SPSPX files and re-read them. After it had done this, it's gone into "fast synchronisation" and has been for about the last five minutes.
Why is it doing this? The nodes were in perfect sync before and all I did was this:
- No iSCSI initiators connected to targets for last hour so *no* new data been written to the nodes
- Stopped StarWind service on node #1
- A minute or so later, restarted the service
- Auto-resync started and node #1 re-read all the SPSPX files
- After that finished, fast synchronisation is busy creating lots of new 5GB SPSPX files
It
shouldn't be doing this. NOTHING accessed node #2 whilst node #1 was down - no targets connected. It was totally idle and everything will be been flushed ages ago. It's not the write-back cache as that's only 128MB big in my lab.
Here's something else that doesn't make sense. During fast sync, node #1 (the node that was down) is merrily writing new SPSPX files around a count of high 50s and above. Kind of expected as it's busy writing something it really shouldn't so new blocks will be added to the end.
However, node #2 (the node that was always up) is reading from the low SPSPX numbers, e.g. 4, 5, 6 etc. Why is it doing this? Those files were created ages ago. All I did was stop and start the service on a HA storage that was idle.
Cheers, Rob.
