WimVD wrote:@Graham8: What are your jobs indicating as the bottleneck?
Source 99% ... though, a Crystal Disk Mark against a network share on the same remote volume shows transfer speeds of ~300ish MB/s and ~3-4 MB/s 4k Q32T1 (which has gone down in speed by roughly half since it was first deployed).
I spoke with someone in support just now. Turns out I had disabled parallel processing a while ago, as a way of reducing the frequency of the server lockups due to the refs metadata memory exhaustion (and it did seem to help). With that set, of course, it's running everything single-threaded, so the performance I'm seeing probably makes sense - especially considering this is for incrementals where it's highly random disk access. Also, the 10:1 difference between "read" and "transferred" is likely due to the veeam blocksize that's being tracked verses the 4k filesystem block size.
In short, my bad - forgot a checkbox. I'll wait a week or two on the other server where I have the new refs patch installed and enabled, and if nothing else crops up, I'll reenable parallel processing, which I think will improve things.