The Toshiba RC100 SSD Review: Tiny Drive In A Big Market
by Billy Tallis on June 14, 2018 9:00 AM ESTAnandTech Storage Bench - Heavy
Our Heavy storage benchmark is proportionally more write-heavy than The Destroyer, but much shorter overall. The total writes in the Heavy test aren't enough to fill the drive, so performance never drops down to steady state. This test is far more representative of a power user's day to day usage, and is heavily influenced by the drive's peak performance. The Heavy workload test details can be found here. This test is run twice, once on a freshly erased drive and once after filling the drive with sequential writes.
The ATSB Heavy test is small enough to reveal some impact from the HMB feature: it clearly makes a big difference to full-drive performance for the 480GB model, and slightly improves empty-drive data rates for both capacities. The 240GB falls apart when full, leading to data rates that are inexcusably bad.
The average and 99th percentile latencies from the RC100 are reasonable when the test is run on an empty drive. For the 480GB model, HMB keeps both latency scores from getting out of control even when the drive is full, but the 240GB model has serious issues with or without HMB.
For both average read latency and average write latency, the 480GB RC100's scores with HMB enabled are competitive with the drives that have onboard DRAM. Disabling HMB makes write latency especially stand out when the 480GB model is full.
The 99th percentile read and write latency scores for the 480GB RC100 are great when HMB is enabled and acceptable without it. The 240GB model also performs reasonably when the drive is not full.
The power efficiency of the RC100 is generally quite good, except when the 240GB model is full and takes forever to finish the test. The HMB feature is particularly helpful for the 480GB RC100, allowing it to complete the full-drive test using barely more energy than the empty-drive run.
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Mikewind Dale - Thursday, June 14, 2018 - link
Interesting review. Thanks.I'm hoping that smaller, 11" and 13" laptops will start offering M.2 2242 instead of eMMC. I've been wary of purchasing a smaller laptop because I'm afraid that if the NAND ever reaches its lifespan, the laptop will be dead, with no way to replace the storage. An M.2 2242 would solve that problem.
PeachNCream - Thursday, June 14, 2018 - link
Boot options in the BIOS may allow you to select USB or SD as an option in the event that a modern eMMC system suffers from a soldered on drive failure. In that case, it's still possible to boot from an OS and use the computer. In that case, I'd go for some sort of lightweight Linux OS for performance reasons, but even a full distro works okay on USB 3.0 and up. SD is a slower option, but you may not want your OS drive to protrude from the side of the computer. Admittedly, that's a sort of cumbersome solution to keeping a low-budget PC alive when replacement costs aren't usually that high.peevee - Thursday, June 14, 2018 - link
"but this is only on platforms with properly working PCIe power management, which doesn't include most desktops"Billy, could you please elaborate on this?
artifex - Thursday, June 14, 2018 - link
Yeah, I'd also like to hear more about this.Billy Tallis - Thursday, June 14, 2018 - link
I've never encountered a desktop motherboard that had PCIe ASPM on by default, so at most it's a feature for power users and OEMs that actually care about power management. I've seen numerous motherboards that didn't even have the option of enabling PCIe ASPM, but the trend from more recent products seems to be toward exposing the necessary controls. Among boards that do let you fully enable ASPM, it's still possible for using it to expose bugs with peripherals that breaks things—sometimes the peripheral in question is a SSD. The only way I'm able to get low-power idle measurements out of PCIe SSDs on the current testbed is to tell Linux to ignore what the motherboard firmware says and force PCIe ASPM on, but this doesn't work for everything. Without some pretty sensitive power measurement equipment, it's almost impossible for an ordinary desktop user to know if their PCIe SSD is actually achieving the <10mW idle power that most drives advertise.peevee - Thursday, June 14, 2018 - link
So by "properly working" you mean "on by default in BIOS"? Or there are actual implementation bugs in some Intel or AMD CPUs or chipsets?Billy Tallis - Thursday, June 14, 2018 - link
Implementation bugs seem to be primarily a problem with peripheral devices (including peripherals integrated on the motherboard), which is why motherboard manufacturers are often justified in having ASPM off by default or entirely unavailable.AdditionalPylons - Thursday, June 14, 2018 - link
That's very interesting. And thanks Billy for a nice review! I too appreciate you doing something different. There will unfortunately always be someone angry on the Internet.Kwarkon - Friday, June 15, 2018 - link
L1.2 is a special PCIe link state that requires hardware CLREQ signal. When L1.2 is active all communication on PCIe is down thus both host and NVME device do not have to listen for data.Desktops don't have this signal ( it is grounded), so even if you tell the SSD (NVME admin commands) that L1.2 support is enabled it will still not be able to negotiate it.
In most cases m.2 NVME require certain PCIe link state to get lowest power for their Power State.
The PS x are just states that if all conditions are met than the SSD will get its power down to somewhere around stated value.
You can always check tech specs of the NVME. If in fact low power is supported than the lowest power will be stated as "deep sleep L1.2 " or similar.
Death666Angel - Saturday, June 16, 2018 - link
Prices in Germany do not line up one bit with the last chart. :D The HP EX920 1TB is 335€ and the ADATA SX8200 960GB is 290€. The SBX just has a weird amazon.de reseller who sells the 512GB version for 200€. The 970 Evo 1TB is 330€ and the Intel 760p 1TB is 352€. And for completeness, the WD Black 1TB is 365€. Even when accounting for exchange rates and VAT, the relative prices are nowhere near the US ones. :)