Among its many features, diglloydTools DiskTester offers a run-area-test command that can be used for relatively fast characterization of drive performance across its capacity. The results can be graphed to get a good idea of the drive performance.
For example, suppose a high performance RAID is envisioned: one laggard can cut the performance, since the slowest drive determines the peak speed.
As shown below, 8 samples were tested, and one of those eight is a significant laggard; this slower drive is best set aside as a cold spare or backup drive.
While DiskTester can test any number of drives simultaneously (via command line), testing should take care not to saturate the bandwidth; for example four fast hard drives can demand almost all of the Thunderbolt v1 bandwidth, and other devices on the bus could suck up bandwidth, disturbing the results.
Click for larger graph.
Some of the capabilities in diglloydTools
Aside from testing hard drive or SSD or RAID performance and reliability with DiskTester, data integrity with IntegrityChecker is a must-have workflow tool for anyone with important data:
- Detecting Corruption / Validating Data Integrity Over Time and Across Drives and Backup/Restore
- What an Impaired SSD Looks Like
- How to Safely Transfer Data or Verify Backups
- Example of Verifying Data Integrity.
- Are Your Backup Drives Still Functional? Are Your Files Subtly Damaged?
- How to Automate DiskUtility Verification of Mounted Volumes.
- Selling that Computer? Wipe Out Personal Files First
- Search for diglloydTools articles.