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DISKSPD 2.0.21a 9/21/2018

50GB File Creation (Change Drive Letter)

diskspd.exe –c50G -d300 -r -w40 -t8 -o32 -b64K -Sh -L E:diskpsdtmp.dat > DiskSpeedResults.txt

• -c50G – file size 50 GB (it is better to use a large file size so that it does not fit in the cache of the storage controller);
• -d300 – test duration in seconds;
• -r – random read/write operations (if you need to test sequential access, use –s);
• -t8 – number of threads;
• -w40 – ratio of write to read operations 40%/60%;
• -o32 — queue length;
• -b64K — block size;
• -Sh — do not use cache;
• -L — measure latency;
• E:diskpsdtmp.dat – test file path.

I have found some recommendations for disk performance in IOPS for some popular Microsoft services:

1. Microsoft Exchange 2010 with 5,000 users, each of them receives 75 and sends 30 emails per day, will require at least 3,750 IOPS;
2. Microsoft SQL 2008 Server with 3,500 SQL transactions per second (TPS) requires 28,000 IOPS;
3. A common Windows application server for 10-100 users requires 10-40 IOPS.

most important disk performance metrics

Using Microsoft Performance Monitor

The recommended Average Disk sec/Read value is below 8ms

Average Disk sec/Write

Average Disk sec/Transfer