Very slow running of onload on V7.24 UC6

I'm running IDS v7.24 UC6 on an HP9000 H70 using HP10.20. I've unloaded to DAT a database which is about 10 GBytes in size. This took about 2.5 hours. An ontape -s takes about the same time. I'm now doing the onload into another database, and it's incredibly slow. The onload is running at a rate of about 1000 disk writes per minute, i.e. it'll take about 16 hours to complete! By comparison, an ontape restore takes about 3 -4 hours. Why the disparity in time? I thought these binary write utilities did more-or-less the same things. Also why, according to onstat -D, is onload reading every page before writing to it ? I've also done the onunload/onload to raw disk instead of tape; makes no difference to the onload speed, so it's not the fault of the tape device. Thanks in advance for any comments Neil Truby aracnet Limited Weybridge, UK