I have tested Exchange 2007 and Exchange 2010 environments for the disk subsystem throughput. What i have found the results were following :exchange 2007 on Windows 2008 SP1Acheived Input/Output per Second 99.065Avg disk sec/read 0.023exchange 2010 on Windows 2008 R2Acheived Input/Output per Second 101.004Avg IO database reads average latency 20.233 And my question is.. Microsoft has said they reduced IOPS performance by 70% , please tell me in what configuration i will be able to get such reduction? I'm currently testing it on SATA 300MB/s hard disk, all set up on virtual environment and i have not found any reduction of IOPS in exchange databases.Best Regards

I would like to add some logs from my testsExchange 2007 :<fieldset><legend>Test Issues</legend> Fail Process has average database read latencies higher than 0.020. </fieldset> <fieldset><legend>Database Sizing and Throughput</legend> Achieved I/O per Second 99.065 Capacity Percentage 100% Throughput Percentage 100% Initial database size 109532954624 Final database size 109908344832 Database files (count) 1 </fieldset> <fieldset><legend>Jetstress System Parameters</legend> Thread count 2 (per-storage group) Log buffers 9000 Minimum database cache 32.0 MB Maximum database cache 256.0 MB Insert operations 40% Delete operations 30% Replace operations 5% Read operations 25% Lazy commits 55% </fieldset> <fieldset><legend>Disk Subsystem Performance</legend> LogicalDisk Avg. Disk sec/Read Avg. Disk sec/Write Disk Reads/sec Disk Writes/sec Avg. Disk Bytes/Write Database (C:) 0.023 0.046 40.557 58.508 (n/a) Log (E:) 0.000 0.003 0.000 35.155 3647.422 </fieldset> <fieldset><legend>Host System Performance</legend> Counter Average Minimum Maximum % Processor Time 0.566 0.000 13.958 Available MBytes 967.219 961.000 993.000 Free System Page Table Entries 33557857.975 33557547.000 33558046.000 Transition Pages RePurposed/sec 0.000 0.000 0.000 Pool Nonpaged Bytes 34252723.200 34238464.000 34271232.000 Pool Paged Bytes 94480324.267 94441472.000 94609408.000 Database Page Fault Stalls/sec 0.000 0.000 0.000 </fieldset>Exchange 2010:<fieldset><legend>Test Issues</legend> Fail Process has average database read latencies higher than 20.000 msec. </fieldset> <fieldset><legend>Database Sizing and Throughput</legend> Achieved Transactional I/O per Second 101.004 Capacity Percentage 100% Throughput Percentage 100% Initial Database Size (bytes) 109899743232 Final Database Size (bytes) 110260453376 Database Files (Count) 1 </fieldset> <fieldset><legend>Jetstress System Parameters</legend> Thread Count 2 (per database) Minimum Database Cache 32.0 MB Maximum Database Cache 256.0 MB Insert Operations 40% Delete Operations 20% Replace Operations 5% Read Operations 35% Lazy Commits 70% Run Background Database Maintenance False Number of Copies per Database 1 </fieldset> <fieldset><legend>Database Configuration</legend> Instance1288.1 Log Path: C:\TestDatabase: C:\Test\Jetstress001001.edb </fieldset> <fieldset><legend>Transactional I/O Performance</legend> MSExchange Database ==> Instances I/O Database Reads Average Latency (msec) I/O Database Writes Average Latency (msec) I/O Database Reads/sec I/O Database Writes/sec I/O Database Reads Average Bytes I/O Database Writes Average Bytes I/O Log Reads Average Latency (msec) I/O Log Writes Average Latency (msec) I/O Log Reads/sec I/O Log Writes/sec I/O Log Reads Average Bytes I/O Log Writes Average Bytes Instance1288.1 20.223 2.199 60.141 40.863 32768.000 37595.624 0.000 0.918 0.000 37.597 0.000 4580.654 </fieldset>