DELL RY491 146GB 3.5" 15000 RPM SAS internal hard drive

Enterprise storage drive

The Dell RY491 is a 146GB 3.5-inch internal hard drive spinning at 15000 RPM with a 16MB cache. It connects through a Serial Attached SCSI (SAS) interface rated at 6Gb/s average latency. The drive is supplied as a bare unit with a tray and is built for server environments where consistent throughput matters.

Sustained workload behaviour

At 15000 RPM the platters maintain high rotational speed during long read and write sequences, reducing latency spikes compared with slower drives. The 16MB buffer absorbs burst traffic while the SAS link keeps command queuing efficient across multiple outstanding I/O requests. This combination suits database logs, virtualisation hosts and other write-heavy server tasks that run for hours.

Thermals noise and power

The low-profile 1.0-inch height allows tighter stacking in drive bays while still moving enough air to keep temperatures stable under continuous operation. SAS signalling runs at lower voltage than older parallel SCSI, helping limit power draw during sustained transfers. Acoustic output remains typical for a 15000 RPM mechanism in a server chassis where fan noise dominates.