Intel Optane 905P Power Loss Protection
One question we get often is around the Intel Optane 905P and 900P power loss protection. Officially, Intel keeps the spec for its highest-end Optane DC P4800X parts. If you have the budget, and your job depends on it, just get the P4800X. If you are on a tight budget, the lower-end Intel Optane drives are great.
The reason for this is that unlike NAND-based write SSDs, the Intel Optane drives to not have large DRAM caches on-device. Without that DRAM, host writes are acknowledged when data is written to the device media. For Optane, this is a direct write, as they do not need buffering through DRAM like NAND SSDs.
If you want to learn more about this, we did an entire piece on the topic, see Exploring the Best ZFS ZIL SLOG SSD with Intel Optane and NAND.
Being clear, we run all of STH’s databases only on Optane 900P and 905P drives mirrored with ZFS. It is an absolutely awesome pairing and every server we deploy into our hosting cluster has at least two Intel Optane SSDs.
Intel Optane 905P 380GB M.2 Drive Specs
Onto the specs, here are the official figures for the Intel Optane 905P 380GB M.2 NVMe SSD:
- Capacity: 380GB
- Media: 3D XPoint
- Form Factor: M.2 22110 (110mm)
- Interface: NVMe / PCIe 3.0 x4
- Warranty: 5-years
- MTBF: 1.6M Hours
- Endurance: 6.93PBW
- UBER: 1 Sector per 10^17 bits read
- Sequential Write Speed: 2.6GB/s
- Sequential Read Speed: 2.2GB/s
- Write IOPS: 575K IOPS
- Read IOPS: 550K IOPS
- Read Latency: 10 µs
- Write Latency: 10 µs
- Power Active: 9.35W
- Power Idle: 2.52W
Three are a few specs we wanted to point out. First, the UBER of 10^17 is not exceptional and the MTBF of only 1.6M hours is lower than many drives now rated at 2M+ hours. Since these devices are not hot-swappable, that is something to consider.
Next, these drives use a ton of power. 2.52W at idle is several times what we see many consumer workstation and notebook drives do. Active 9.35W is also much higher than other consumer drives. If you have a laptop, this is not the drive you want to help battery life and it likely will not even fit. Most workstation users will be better off with a NAND SSD with a higher capacity. 380GB is small and if you do not care about heavy write workloads, then consumer NAND SSDs are fine. In fact, if you need a read cache drive in a server (L2ARC in our ZFS example), you are often better off with a consumer drive that has a larger capacity.
If you need heavy write performance, small 4K read/ write performance and have enough power and cooling to spare, the 2.6GB/s and 2.2GB/s and over half a million IOPS is exceptional for M.2 22110 drives.
Intel Optane 905P 380GB M.2 Power Consumption
We wanted to test the power consumption numbers since they are fairly high. Here is what we got on our Extech TrueRMS power meter at the wall by adding the drives and observing the delta:
- Idle: 2.7W
- Active 70/30: 9.9W
That is a bit higher than Intel’s spec, but in-line with expectations. We are measuring at the wall not just measuring the device because we want to know the real impact of adding these drives to a server. If you add two to a server, estimate a power budget of around 20W. That is significant in lower-density hosting where you may only have 120W to use per rack U. On a per-drive basis, that is about 18% more power than a Seagate XP400HE30002 NAND SSD that offers less performance and a similar (400GB) capacity.
Next onto performance before we get to our final thoughts.