Hi,

When deploying new project, we discovered poor performance [1] of hard drives 
Western Digital Ultrastar DC HC560 (20TB, WUH722020BLE6L4). It consists in the 
fact that with an object size of less than 128k, the speed of the Ceph pool is 
equivalent to a USB flash drive. Be vigilant when make order. If anyone has 
such devices with a different firmware, please share the info


Model Family: Western Digital Ultrastar DC HC560
Device Model: WDC WUH722020BLE6L4
Serial Number: 8LK364ER
LU WWN Device Id: 5 000cca 2c7ebbaaf
Firmware Version: PQGNW540
User Capacity: 20,000,588,955,648 bytes [20.0 TB]
Sector Size: 4096 bytes logical/physical
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Device is: In smartctl database 7.3/5625
ATA Version is: ACS-5 (minor revision not indicated)
SATA Version is: SATA 3.5, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Thu Jul 3 08:18:32 2025 UTC
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM feature is: Unavailable
APM feature is: Disabled
Rd look-ahead is: Enabled
Write cache is: Disabled
DSN feature is: Unavailable
ATA Security is: Disabled, NOT FROZEN [SEC1]


[1] https://tracker.ceph.com/issues/71927

Thanks,
k

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