SAS SSDs

Generally yes. SAS runs at 12Gb/s against 6Gb/s for SATA, and it is full duplex, so it can read and write at the same time. Under a mix of reads and writes from many users, as in databases and virtualisation, that gap shows. For light workloads a SATA SSD is often enough.

If the controller and backplane are SAS, yes. Most enterprise server RAID controllers are SAS and accept both SAS and SATA drives. A SATA-only controller or backplane cannot run SAS drives. Send us the server model or controller name and we will confirm.

The drive has two independent SAS connections. In a storage array with two controllers, each controller links to the drive, so the array keeps running if one controller or path fails. In a single-controller server only one port is used, and the drive works normally.

Choose SAS where the server already has SAS RAID controllers and backplanes, since the drives slot straight in and use hardware RAID. NVMe gives lower latency but needs NVMe-wired bays or PCIe slots. For many existing servers SAS is the practical upgrade.

In the same server, yes, as separate arrays on the same controller. Avoid mixing them in one array, as the array runs at the speed of its slowest drives. Many setups put the operating system and busy data on SSD and bulk data on hard drives.