Seagate Introduces New Generation of Enterprise Performance 15K HDDs with NAND Cachingby Anton Shilov on October 26, 2016 2:30 PM EST
- Posted in
- Enterprise Performance 15K
Seagate on Tuesday announced its new generation of hard drives with 15K spindle speed and up to 900 GB capacity. The new HDDs use NAND caching to boost response times, offer additional SED and SED-FIPS security features at no extra cost and boast with enhanced reliability for 24x7 workloads.
The new Seagate Enterprise Performance 15K v6 HDDs come in 300, 600 and 900 GB configurations. Just like their predecessors, they use a dual port SAS 12 Gbps interface as well as a 2.5”/15 mm form-factor. The new Enterprise Performance 15K v6 hard drives have single or dual level caches: either a 256 MB of DRAM cache only or a 256 MB of DRAM cache and a 16 GB of NAND flash cache (4Kn/512E models only). The latter is used for caching of frequently used “hot” data to maximize read performance and reduce latencies (Seagate offers similar capability with its consumer-grade FireCuda and other SSHDs). It is noteworthy that Seagate reduced the amount of NAND flash compared to previous-generation 15K HDDs, but the company seems to believe that its improved caching algorithms will ensure that the new drives are faster than their predecessors.
When compared to predecessors, the new sixth-generation 15K HDDs are rated for a 27% increase in sequential read write speed: up to 315 MB/s. In addition, the drives also promise 100% faster random write performance. Seagate claims that its advanced caching algorithms promote hot data three times faster when compared to 512N drives without NAND, but it does not reveal exact performance numbers for its NAND cache. When it comes to reliability, Seagate declares 2 million hours MTBF and an annualized failure rate of 0.44%, which is in line with the predecessors.
|Seagate Enterprise Performance 15K v6 Family at Glance|
|Capacity||300 GB||600 GB||900 GB|
|Model Number||Standard Model||512N||ST300MP0006||ST600MP0006||ST900MP0006|
|Controller||Seagate's proprietary LSI|
|DRAM Cache||256 MB DRAM|
|NAND Flash Cache||512N||none|
|512E/4Kn||16 GB of read cache|
|Form-Factor, Interface||2.5", SAS 12 Gbps|
|Sustained Transfer Rate (Outer to Inner Diameter)||512N||300 MB/s ~ 210 MB/s|
|512E/4Kn||315 MB/s ~ 215 MB/s|
|Average Latency||2 ms|
|Random Read IOPS||720 IOPS|
|Random Write IOPS||400 IOPS|
|Power Consumption||6.9 W||7.2 W||7.6 W|
|TCG Opal Encryption||Yes|
To simplify inventory management, Seagate will offer Seagate Enterprise Performance 15K v6 hard drives with its FastFormat feature, which allows formatting the drives to either 512 emulation or 4K native formats, thus reducing the number of models the manufacturer has to produce and its resellers have to keep in stock.
Nowadays 15K HDDs are no longer the fastest storage devices, even in RAID environments - modern high-end enterprise-class SSDs usually offer considerably higher random and sequential performance. Nonetheless, 10K and 15K hard drives for mission-critical applications are still used by multiple datacenters worldwide. Moreover, some say that there are deployments that use both mission-critical SSDs as well as fast mission-critical HDDs, which suggests that the new drives will have some demand. In fact, Seagate claims that the total available market for such HDDs is around six million units per quarter, but admits that sales of 15K drives have been declining recently. Still, the company itself sells roughly three million of such drives every three months. Given the very long life cycles of mission-critical HDDs, it looks like development of this 15K generation makes sense for Seagate.
Exact pricing of Seagate’s sixth-generation Enterprise Performance 15K HDDs will depend on volumes and contracts. Interested parties should get in contact directly with their local Seagate distribution partners.
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DanNeely - Wednesday, October 26, 2016 - linkI'm curious why the capacities are as low as they are when they're selling denser/thinner 2.5" drives at consumer speeds. Does the higher spindle speed need larger bit cells on the platters for accurate IO, or are they short-stroking the platters/using <2.5" platters to reduce seek latency?
peterfares - Wednesday, October 26, 2016 - linkRight, what are the applications for these drives? Why wouldn't you just use a SSD?
ImSpartacus - Wednesday, October 26, 2016 - linkYeah, I'm still not sure why SSDs aren't better. Is it a lifespan issue?
wumpus - Thursday, October 27, 2016 - linkI'm assuming a tradition-bound boss in charge of purchases who doesn't believe SSD alone can do the job. Lifespan might be an issue, but only considering the cost of having an intern manually swap the drives and a sysadmin set them up (the replacement cost of a 900GB SSD in 3+ years won't be an issue).
I imagine this is simply the "easy choice", it has been done and shown to work. Switching to SSD requires a bit of time while a professional seriously considers the issues, then whatever changes to the memory system might need to be made (expensive, and can presumably be put off for a few quarters).
Don't underestimate the importance of pointing fingers in a corporate environment, the guy who buys spinning seagate enterprise drives that subsequently fail blames seagate. The guy who buys SSDs that subsequently fail gets blamed. Who do you think is leaving the next layoff?
MrSpadge - Wednesday, October 26, 2016 - linkNo, that's not what he said.
You'd use these instead of an SSD if they provide:
- enough performance for a better TCO
- provide better write endurance
- some other reason you deem important
danielfranklin - Wednesday, October 26, 2016 - linkCost per GB is far lower when comparing to SSDs that can sustain these kind of work loads.
More servers than not still use disks like this, though increasingly its moving towards SANs that use multiple levels of storage, Eg. DRAM>SSD>SAS>SATA
saharadusud - Tuesday, January 10, 2017 - linkthaaaaaaaaanks http://www.clashroyalehacke.com/
MrSpadge - Wednesday, October 26, 2016 - linkExactly that: the slower the platters are moving below the heads, the more time they've got for read/write operations. And the more precise they can be, i.e. handle higher data densities.
nunya112 - Wednesday, October 26, 2016 - linkthey need less platters as the weight becomes too much at 15,000 rpm
same as an engine the higher the revs the lighter the moving parts need to be and shorter stroke (less rotating mass)
same problem here
Concillian - Thursday, October 27, 2016 - linkPlatters are smaller diameter than in 2.5" laptop drives, yes. High data rate aerial density is more difficult than low data rate aerial density.
These are also used in applications where, for whatever reason the supporting hardware and software requires 512byte native formatting, which eats about 15% more space in the formatting area compared to if it was a drive that would only be 4k native (which is pretty much every other type of drive at this point).
This is a niche market product.