The reason that SE 9.0 says data ration instead of compression ratio is because SE 9.0 support the Powermax arrays that can perform compression and deduplication. So the data ratio is a combination of compression and dedupe. If you have a VMAX 250F for example, it only supports compression so the reporting in SE 9.0 will just be the compression calculation. You can manually calculate the compression ratio if you really want to be sure the reporting is good. I posted a method for this here.
hi all,  could someone explain why some ratio outputs are different? same command on the same VMAX, but different SE version thanks a lot  SE9.0 #symcfg -sid xxx list -srp -efficiency   STORAGE RESOURCE POOLS EFFICIENCY  Symmetrix ID  : 000 --------------------------------------------------------------------------        Overall  Data  Reduction   VP      Snapshot Name  Ratio    Ratio  Enabled    Ratio    Ratio -------------------------------- ------- ------- ------- -------- -------- SRP_1 11.3:1   2.5:1     100    1.5:1    22.7:1  SE8.4 #symcfg -sid xxx list -srp -efficiency   STORAGE RESOURCE POOLS  Symmetrix ID  : 000 -----------------------------------------------------------------  Overall SRP Efficiency       VP    Snapshot   Comp    Overall Name Ratio    Ratio   Ratio    Ratio -------------------------------- ------- -------- ------ -------- SRP_1 1.5:1   22.7:1  2.8:1   12.7:1
symcfg -sid xxx list -srp -efficiency output different between SE8.4 and SE9.0