SAS SSDs
SAS SSDs are solid state drives on the Serial Attached SCSI interface, so they install in SAS-capable drive bays and run on SAS RAID controllers and HBAs, the same as SAS hard drives. They come as 2.5-inch drives at 12Gb/s and 24G SAS, with older 6Gb/s models; check the listing for its endurance class and for any SED or FIPS encryption. Our lab tests each SAS SSD on receipt and again before shipping.
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Dell 4NMJF 3.84TB SAS SSD 2.5" 12Gbps EP+ Solid State DriveAvailability: Only 1 leftManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest Pricing - Dell 4YPVD 960GB TLC SAS 2.5" 12Gbps RI ISE Solid State Drive | WUSTR1596ASS200Availability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 5H9RV 3.2TB TLC SAS 2.5" 12Gbps MU Solid State Drive | MZILT3T2HALS0D3Availability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 5HR3X 1.6TB MLC SAS 2.5" 12Gbps WI Solid State Drive | HUSMM1616ASS204Availability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 5ND33 1.92TB TLC SAS SSD 2.5" 12Gbps RI ISE Solid State DriveAvailability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 5VHHG 400GB eMLC SAS SSD 2.5" 12Gbps WI Solid State Drive | PX05SMB040YAvailability: In StockManufacturer: Dell Condition: Refurbished 1 Year WarrantyBuy Now$94.99
- Dell 5WPFT 15.36TB TLC SAS SSD 2.5" 12Gbps RI Solid State Drive MZILT15THMLA0D3Availability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 63GYR 3.2TB eMLC SAS SSD 2.5" 12Gbps WI Solid State Drive | PX04SMB320Availability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 6K55X 200GB SAS SSD 2.5" 6Gbps WI Solid State Drive | Toshiba MK2001GRZBAvailability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 6R5R8 200GB SAS SSD 2.5" 6Gbps MU Solid State Drive | Pliant LB206MAvailability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 6XD6N 400GB TLC SAS SSD 2.5" 12Gbps WI ISE Solid State DriveAvailability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Dell 8038H 3.2TB BiCS SAS SSD 2.5" 12Gbps WI Solid State Drive | KPM5XMUG3T20Availability: Available by QuoteManufacturer: Dell Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
When a SAS SSD is the right choice
Pick a SAS SSD when the server or array already runs SAS and needs flash in the same bays. SAS SSDs install in SAS backplanes, run behind the same PERC, Smart Array and HBA controllers as SAS hard drives, and keep SAS's second port: Seagate builds its 12Gb/s SAS SSDs with dual ports, and KIOXIA quotes up to 720,000 random 4 KiB reads per second for its 24G SAS read-intensive drives in dual-port mode.
SAS SSD vs NVMe vs SATA SSD
SAS SSDs fit servers that already have a SAS backplane and controller, NVMe fits NVMe-capable bays, and SATA fits the widest range of controllers; the sequential-read figures are examples from each maker's data sheet:
| Interface | Interface speed | Sequential read (data sheet example) | Ports | Best for |
|---|---|---|---|---|
| 24G SAS SSD | 22.5Gb/s per lane, backward compatible with 12Gb/s and 6Gb/s SAS | Up to 4,200 MB/s (KIOXIA, dual-port) | Dual-port | 24G controllers such as Dell's PERC 12 family |
| SAS SSD (12G) | 12Gb/s per port | Up to 2,200 MB/s (Seagate, dual-port) | Dual-port (HA capable) | RAID arrays, existing SAS backplanes, HA clusters |
| NVMe SSD | PCIe Gen 4 and Gen 5 | Up to 7,400 MB/s (Seagate, Gen 4) | Single- or dual-port, by model | Latency-critical apps, scratch/cache, all-flash |
| SATA SSD (6G) | 6Gb/s | Up to 550 MB/s (Samsung data-center SATA) | Single-port | Boot drives, secondary storage, cost-sensitive deployments |
Behind a 12Gb/s controller such as a PERC 11, a 24G SAS SSD links at the lower rate.
SAS SSD vs SAS hard drive
On the same 12Gb/s port, a SAS SSD moves data several times faster than the quickest SAS hard drive, and it skips the 2.0 ms average rotational wait a 15K drive pays on every random access. The hard drive keeps its place where capacity per bay matters more than speed; see SAS hard drives.
Endurance classes for SAS SSDs
SAS SSDs come in three endurance classes, and Seagate's 12Gb/s SAS line shows how each class pairs with its own capacity points:
| Class | Rated drive writes per day | Capacity points in Seagate's line | Workload |
|---|---|---|---|
| Read-intensive (Seagate: scaled endurance) | 1 | 960GB, 1.92TB, 3.84TB, 7.68TB, 15.36TB | Read-heavy work |
| Mixed use | 3 | 800GB, 1.6TB, 3.2TB, 6.4TB | Mixed reads and writes |
| Write-intensive | 10 | 400GB, 800GB, 1.6TB, 3.2TB | Write-heavy work |
That is why a 960GB and an 800GB drive are rarely the same class. The pattern follows over-provisioning, which Seagate describes as flash set aside from the user to raise endurance. Compare the capacity points on 960GB SSDs and 800GB SSDs.
What a SAS SSD needs in the server
A SAS SSD needs a SAS-capable drive bay and backplane plus a SAS HBA or SAS RAID controller because, per Seagate, a SAS drive will not work on a SATA-only controller. Build SAS SSDs into their own virtual disks, since PERC 11 does not allow SAS and SATA drives in the same one, and order drive carriers separately under hard drive caddies and trays. Controllers are on SAS HBAs and RAID controllers.
SAS SSD questions
- Is a SAS SSD faster than a SAS hard drive?
- Yes, by a wide margin. Seagate rates its dual-port 12Gb/s SAS SSDs at up to 2,200 MB/s sequential read, against 210 to 300 MB/s sustained for its 2.5-inch 15K SAS hard drives, and an SSD has no 2.0 ms rotational wait on random reads. Both use the same SAS bays and controllers, so a SAS SSD is a drop-in speed upgrade where the server already runs SAS.
- Can a SAS SSD go in a SATA-only server?
- No. A SAS SSD needs a SAS controller or SAS HBA and a SAS-capable backplane, and Seagate's support note rules out connecting a SAS drive to a SATA controller. The reverse works, since a SAS controller also runs SATA drives. In a SATA-only server, choose a SATA SSD, or add a SAS controller and the backplane support it requires.
- SAS SSD or NVMe: which should I choose?
- Choose by the bays you have. NVMe reads faster, up to 7,400 MB/s on Seagate's Gen 4 drives against 2,200 MB/s on its 12Gb/s SAS SSDs, but it needs NVMe-capable bays or a PCIe slot. A SAS SSD drops into existing SAS backplanes and controllers and keeps a second port. PERC 11 also keeps NVMe drives out of SAS and SATA virtual disks.
Comparing across the whole range? See all server SSDs, SATA SSDs, NVMe SSDs and U.2 NVMe SSDs, or read our explainers on SSD endurance classes and DWPD and TBW ratings; SAS vs SATA covers the interfaces.
