Replaced disk on 6.7 server with  several hiccups along the way and finally started re-synch.  Noticed later that it had slowed with the following log items.  Any thoughts.  Replaced cable and disk went through 2 preclear tests at expected speed before the rebuild. 

rebuild.txt

Looks like a connection problem but posting the full diags would be preferable.

here are the diags

tower1-diagnostics-20190803-0950.zip

Still looks like a connection issue, power down, replace both cables on disk8 and try rebuilding again.

Thanks,  did the above already and am at 1% at 90+mb/sec.  However, this was the same as before when the rebuild went to slow down at around 10%.  Should be another hour and cross my fingers. 

Before bedtime server was over 10% and still going strong.  This morning, it was at 57% and 1mb/sec and 31 days.  Swapped cables with another drive and give it another try.  Later, if not normal, will revise power cables.  If not effective will re-install last drive and try again..

Thanks for the directive.  Finished with no errors.  Mystery why swapping cable positions worked and the drive the questionable cable was connected to did not error out.