Article ID: 000096684 Content Type: Product Information & Documentation Last Reviewed: 09/28/2023

RAID 5 Initialization Extremely Slow on Z790


• MSI Z790 MB • i7 13700K • 32gb RAM • 3x Seagate ST2000DM008 in RAID 5 (new, unused, blank) • Samsung 980 Pro 2tb system drive. • Windows 11, latest intel RST drivers (19.5).


Disk performance, RAID configurations, and the impact of initialization on system performance.


The initialization process of a RAID 5 array on a Z790 system with three new 2 TB SATA hard drives is experiencing significant slowness. Even after 16 hours, the initialization process has only reached 7% completion, indicating an extremely slow progress rate. At this pace, it is estimated to take nearly 10 days to complete the initialization. This issue is being observed when configuring the RAID 5 array using the Optane software.


Information about the issue:

  • What is the normal time for this process?

    This depends on the disk performance. For example, different performance between GEN3/GEN4 NVMe, SATA SSD, SATA HDD 5400 rpm and 7200 rpm.

  • Assuming this is abnormal, what could be the cause?

    We previously observed one performance issue related to SATA HDD cache design. Ex: Seagate ST500LX025.

  • If this eventually finishes, then someday a drive fails, does that also mean I'm looking at a similar time frame to rebuild the lost data? If so, I need to rethink RAID 5 as a viable option and get another drive for 0+1.

    If one disk fails, it can still work, and you can get a new disk to rebuild RAID5. This rebuild can be done by the HSA app.

  • While initializing, the task manager shows zero drive activity. Is this normal?

    RAID initializing is mainly working inside the RST driver.

  • While initializing, disk benchmark numbers drop tremendously. Read/write goes from 220/200 down to like 40/20. Normal?

    Since the RST driver is working on the initializing, it’s expected the performance will be impacted.

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