>>I use LTO Gen 2. Its read/write speed is 15-20 MB/s more than network speed >>(100Mbps). So migration is faster than backup
Maybe, but 20% of your 18gb pool is not a lot spare, and I do not think you will get a continuous migration process anyway. It will reach zero and then go all the way back to potentially more than 80% depending how big the file in progress is. To find out exactly what is happening you could schedule regular say 10 minute through the night "q stg" commands so you can see exactly what is going on with your disk pool. John ********************************************************************** The information in this E-Mail is confidential and may be legally privileged. It may not represent the views of Scottish and Southern Energy Group. It is intended solely for the addressees. Access to this E-Mail by anyone else is unauthorised. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. Any unauthorised recipient should advise the sender immediately of the error in transmission. Unless specifically stated otherwise, this email (or any attachments to it) is not an offer capable of acceptance or acceptance of an offer and it does not form part of a binding contractual agreement. Scottish Hydro-Electric, Southern Electric, SWALEC, S+S and SSE Power Distribution are trading names of the Scottish and Southern Energy Group. **********************************************************************