We are currently running 2 ADSM systems, each consist of  an IBM
  RISC/6000,  Exbyte 480 (80 - 8mm tapes with 4 tape drives each) Tape
  Storage Pool; a Data General Cariion 40Gb Data Storage Pool and a 2Gb
  data base. We are backing up 300 NT servers and 30 Unix servers spread
  out over our WAN. Our ADSM servers are on 2 different FDDI rings and our
  NT and Unix clients are on either T/R 4-16 Mbps or Ethernet 10Mbps.

   Does anyone have any recommendations for hardware/software configuration
  than could meet the following requirements :

  1- We have a need to backup 2Tera bytes of data with growth up to 4 Tb
  within the next 2-4years.

  2- We currently have NT servers with partitioned drives of 20Gb, as DASD
  grows so will our drive  sizes.

  3- We would like to be able to restore data at a rate of 1Gb/hr or
  faster.

  So far the Exbyte is the bottle neck on our throughput once the backup
  process starts. However it has taken up to 2 hours simply to query the
  data base for the list of files that we may need to restore. This data
  base problem and the tape throughput is killing us.

  Is ADSM the product that we need to stick with or is there something else
  we should be looking at or is this a hardware/configuration issue?

  Thanks for any help you guys might be able to provide.
  Stan Efird
  sefird AT dpcmail.dukepower DOT com