Microsoft recommends to use the DiskSpd ( ) utility for generating a load on a disk (storage) system and measuring its performance. For a RAID array of 4 disks, the threshold value of disk queue length is 8.ĭiskSpd: Testing Disk Performance and IOPS in Windows For a single disk, the queue length should not exceed 2. Disk Queue Length – average number of read/write requests that were queued. It may also indicate that the application is requesting too large blocks of data that cannot be transferred in one operation Split IO/sec – a disk fragmentation indicator when the operating system has to split one I/O operation into multiple disk requests.Maximum values depend on the disk type (150-250 Mb/s – for a regular HDD disk and 500-10000 for SSD) Disk Bytes/Sec – Total disk throughput (read+write) per second.This is the main indicator of the disk access intensity (approximate IOPS values for different disk types are listed at the end of the article) The number of read/write operations per second. For high load servers, the disk latency value should not exceed 10 ms (0.1) If the delay is more than 25 ms (0.25), then the disk array cannot handle the I/O operation on time. Disk sec/Transfer – the time required to perform one write/read operation with the storage device or disk ( disk latency).When analyzing the counter data, it is advisable for you to understand the current physical disks (storage) configuration (whether RAID or Stripe is used, the number and types of disks, cache size, etc.). By default, counter values are collected every 15 seconds. ![]() You can change other data collection properties. ![]()
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