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