SAS SSDs offer two ports for multipath or redundant controllers, 12 Gb/s instead of 6 Gb/s and more robust error handling. SATA SSDs are cheaper and sufficient for boot drives, read-intensive workloads or homelabs. Both types run on a SAS controller.

Drive writes per day states how often the full capacity can be written each day over the manufacturer's warranty period (usually five years). Read-intensive models are around 1 DWPD, mixed-use models around 3 and write-intensive models 10 or more.

Will a U.2 SSD fit my server?

Only in bays wired for NVMe, which Dell and HPE usually label separately. Alternatively, run U.2 drives from a PCIe adapter card. A U.2 SSD is not detected in plain SAS/SATA bays.

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Server SSDs

Server SSDs are built for sustained data center workloads: capacitors protect the write cache during power loss (power loss protection), performance stays consistent under continuous writes and endurance is specified in DWPD (drive writes per day). Here you will find SATA and SAS SSDs in 2.5-inch format as well as NVMe SSDs in U.2 and M.2. Before buying, check how your server connects drives: a 12 Gb/s SAS SSD needs a SAS controller or HBA, U.2 drives need an NVMe-capable backplane or a PCIe adapter card and will not work in plain SAS/SATA bays. Matching drive caddies are available for Dell and HPE servers. For used SSDs we check the remaining life from the SMART data and test them before shipping. Warranty is 12 to 36 months.

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Buying server SSDs: interface, endurance and condition

Finding the right server SSD takes three steps. First, your server determines which interface is possible. Then the write load decides which endurance class you need. With used drives, wear level is the third factor. The technical background on protocols, form factors and backplanes is in our guide SAS vs SATA vs NVMe.

SAS SSD, SATA or NVMe: what your server dictates

SATA (6 Gb/s, about 550 MB/s): works on any onboard port, HBA or RAID controller. The economical choice for boot drives, web servers and homelabs.
SAS SSD (12 Gb/s, about 1 GB/s per port): the fastest option behind a hardware RAID controller such as Dell PERC or HPE Smart Array. In servers without NVMe bays it's the first choice for VM datastores.
NVMe (PCIe 3.0 x4 about 3 GB/s, PCIe 4.0 x4 about 7 GB/s): needs NVMe-capable bays or an adapter card. For databases and highly parallel access it delivers many times the IOPS.

A look at the server configuration is enough: if the bays are cabled to a RAID controller, SAS and SATA SSDs are the given. NVMe drives only work in bays with PCIe connections or via a tri-mode controller.

Choosing an enterprise SSD by endurance

Server SSDs come as Read Intensive (about 1 DWPD), Mixed Use (about 3 DWPD) and Write Intensive (10 DWPD and up). Read Intensive is enough for most virtualisation hosts, file servers and web servers, which usually write well under their full capacity per day. Mixed Use pays off for write-heavy databases, Write Intensive for logs, caches and ZFS SLOG devices.

Model	Interface	Capacity	Endurance	Typical use
Samsung PM893	SATA 6 Gb/s	960 GB	1,752 TBW (≈ 1 DWPD)	boot, web servers, homelab
HPE 960 GB SAS RI	SAS 12 Gb/s	960 GB

Questions about Server SSDs

Answers to the questions we hear most often before a first order.

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Dell 1.92 TB SAS RI	SAS 12 Gb/s	1.92 TB	Read Intensive	VM datastores in PowerEdge 14G/15G

Samsung PM9A3	NVMe PCIe 4.0 x4, U.2	1.92 and 3.84 TB	1 DWPD	many VMs, databases, Ceph

Intel P4510	NVMe PCIe 3.1 x4, U.2	4 TB	6.3 PBW (≈ 0.9 DWPD)	large, read-heavy NVMe pools

Intel Optane P4800X	NVMe PCIe 3.0 x4, U.2	375 GB	30 DWPD	ZFS SLOG, Ceph DB/WAL, caches

Server SSDs: SAS SSD, SATA & NVMe U.2 – with PLP