The OCZ Vector 180 (240GB, 480GB & 960GB) SSD Review
by Kristian Vättö on March 24, 2015 2:00 PM EST- Posted in
- Storage
- SSDs
- OCZ
- Barefoot 3
- Vector 180
AnandTech Storage Bench - Heavy
While The Destroyer focuses on sustained and worst-case performance by hammering the drive with nearly 1TB worth of writes, the Heavy trace provides a more typical enthusiast and power user workload. By writing less to the drive, the Heavy trace doesn't drive the SSD into steady-state and thus the trace gives us a good idea of peak performance combined with some basic garbage collection routines.
| AnandTech Storage Bench - Heavy | ||||||||||||
| Workload | Description | Applications Used | ||||||||||
| Photo Editing | Import images, edit, export | Adobe Photoshop | ||||||||||
| Gaming | Pllay games, load levels | Starcraft II, World of Warcraft | ||||||||||
| Content Creation | HTML editing | Dreamweaver | ||||||||||
| General Productivity | Browse the web, manage local email, document creation, application install, virus/malware scan | Chrome, IE10, Outlook, Windows 8, AxCrypt, uTorrent, AdAware | ||||||||||
| Application Development | Compile Chromium | Visual Studio 2008 | ||||||||||
The Heavy trace drops virtualization from the equation and goes a bit lighter on photo editing and gaming, making it more relevant to the majority of end-users.
| AnandTech Storage Bench - Heavy - Specs | ||||||||||||
| Reads | 2.17 million | |||||||||||
| Writes | 1.78 million | |||||||||||
| Total IO Operations | 3.99 million | |||||||||||
| Total GB Read | 48.63 GB | |||||||||||
| Total GB Written | 106.32 GB | |||||||||||
| Average Queue Depth | ~4.6 | |||||||||||
| Focus | Peak IO, basic GC routines | |||||||||||
The Heavy trace is actually more write-centric than The Destroyer is. A part of that is explained by the lack of virtualization because operating systems tend to be read-intensive, be that a local or virtual system. The total number of IOs is less than 10% of The Destroyer's IOs, so the Heavy trace is much easier for the drive and doesn't even overwrite the drive once.
| AnandTech Storage Bench - Heavy - IO Breakdown | |||||||||||
| IO Size | <4KB | 4KB | 8KB | 16KB | 32KB | 64KB | 128KB | ||||
| % of Total | 7.8% | 29.2% | 3.5% | 10.3% | 10.8% | 4.1% | 21.7% | ||||
The Heavy trace has more focus on 16KB and 32KB IO sizes, but more than half of the IOs are still either 4KB or 128KB. About 43% of the IOs are sequential with the rest being slightly more full random than pseudo-random.
| AnandTech Storage Bench - Heavy - QD Breakdown | ||||||||||||
| Queue Depth | 1 | 2 | 3 | 4-5 | 6-10 | 11-20 | 21-32 | >32 | ||||
| % of Total | 63.5% | 10.4% | 5.1% | 5.0% | 6.4% | 6.0% | 3.2% | 0.3% | ||||
In terms of queue depths the Heavy trace is even more focused on very low queue depths with three fourths happening at queue depth of one or two.
I'm reporting the same performance metrics as in The Destroyer benchmark, but I'm running the drive in both empty and full states. Some manufacturers tend to focus intensively on peak performance on an empty drive, but in reality the drive will always contain some data. Testing the drive in full state gives us valuable information whether the drive loses performance once it's filled with data.
It sure seems like Samsung is the only manufacturer that has figured out a secret recipe to boost throughput with SATA 6Gbps because all the other drives are hitting a wall at ~290MB/s.
In terms of latency the difference between all drives is much more marginal. The Vector 180 has a small advantage over the Extreme Pro at larger capacities, although once again the 850 Pro tops the charts.
The Vector 180 is also very consistent with only a small number of >10ms IOs. Oddly enough, the 240GB does better when it's full, although I think that might be just an anomaly since it practically makes no sense at all.
Similar to what we saw in The Destroyer benchmark, the 240GB and 480GB Vector 180 has wonderful load power characteristics and the difference to other drives is actually fairly significant.
Facebook
Twitter
RSS
89 Comments
View All Comments
nils_ - Wednesday, March 25, 2015 - link
It's an interesting concept (especially when the Datacenter uses a DC Distribution instead of AC), but I don't know if I would be comfortable with batteries in everything. A capacitor holds less of a charge but doesn't deteriorate over time and the only component that really needs to stay on is the drive (or RAID controller if you're into that).nils_ - Wednesday, March 25, 2015 - link
"I don't think it has been significant enough to warrant physical power loss protection for all client SSDs."If a drive reports a flush as complete, the operating system must be confident that the data is already written to the underlying device. Any drive that doesn't deliver this is quite simply defective by design. Back in the day this was already a problem with some IDE and SATA drives, they reported a write operation as complete once the data hit the drive cache. Just because something is rated as consumer grade does not mean that they should ship defective devices.
Even worse is that instead of losing the last few writes you'll potentially lose all the data stored on the drive.
If I don't care whether the data makes it to the drive I can solve that in software.
shodanshok - Wednesday, March 25, 2015 - link
If a drive receive an ATA FLUSH command, it _will_ write to stable storage (HDD platters or NAND chips) before returning. For unimportant writes (the ones not marked with FUA or encapsulated into an ATA FLUSH) the drive is allowed to store data into cache and return _before_ the data hit the actual permanent storage.SSDs adds another problem: by the very nature of MCL and TLC cells, data at rest (already comitted to stable storage) are at danger by the partial page write effect. So, PMF+ and Crucial's consumer drive Power Loss Protection are _required_ for reliable use of the drive. Drives that don't use at least partial power loss protection should use a write-through (read-only cache) approach at least for the NAND mapping table or very frequent flushes of the mapping table (eg: Sandisk)
mapesdhs - Wednesday, March 25, 2015 - link
How do the 850 EVO & Pro deal with this scenario atm?
Ian.
Oxford Guy - Wednesday, March 25, 2015 - link
"That said, while drive bricking due to mapping table corruption has always been a concern, I don't think it has been significant enough to warrant physical power loss protection for all client SSDs."I see you never owned 240 GB Vertex 2 drives with 25nm NAND.
prasun - Wednesday, March 25, 2015 - link
"PFM+ will protect data that has already been written to the NAND"They should be able to do this by scanning NAND. The capacitor probably makes life easier, but with better firmware design this should not be necessary.
With the capacitor, the steady state performance should be consistent, as they won't need to flush mapping table to NAND regularly.
Since this is also not the case, this points to bad firmware design
marraco - Wednesday, March 25, 2015 - link
I have a bricked Vertex 2 resting a meter away. It was so expensive that I cannot resign to trow it at the waste.I will never buy another OCZ product, ever.
OCZ refused to release the software needed to unbrick it. Is just a software problem. OCZ got my money, but refuses to make it work.
Do NOT EVER buy anything from OCZ.
ocztosh - Wednesday, March 25, 2015 - link
Hello Marraco, thank you for your feedback and sorry to hear that you had an issue with the Vertex 2. That particular drive was Sandforce based and there was no software to unbrick it unfortunately, nor did the previous organization have the source code for firmware. This was actually one of the reasons that drove the company to push to develop in-house controllers and firmware, so we could control these elements which ultimately impacts product design and support.Please do contact our support team and reference this thread. Even though this is a legacy product we would be more than happy to help and provide support. Thank you again for your comments and we look forward to supporting you.
mapesdhs - Wednesday, March 25, 2015 - link
Indeed, the Vertex4 and Vector series are massively more reliable, but the OCZ hatersignore them entirely, focusing on the old Vertex2 series, etc. OCZ could have handled
some of the support issues back then better, but the later products were more reliable
anyway so it was much less of an issue. With the newer warranty structure, Toshiba
ownership & NAND, etc., it's a very different company.
Irony is, I have over two dozen Vertex2E units and they're all working fine (most are
120s, with a sprinkling of 60s and 240s). One of them is an early 3.5" V2E 120GB,
used in an SGI Fuel for several years, never a problem (recently replaced with a
2.5" V2E 240GB).
Btw ocztosh, I've been talking to some OCZ people recently about why certain models
force a 3gbit SAS controller to negotiate only a 1.5gbit link when connected to a SATA3
SSD. This occurs with the Vertex3/4, Vector, etc., whereas connecting the SATA2 V2E
correctly results in a 3Gbit link. Note I've observed similar behaviour with other brands,
ditto other SATA2 SSDs (eg. SF-based Corsair F60, 3Gbit link selected ok). The OCZ
people I talked to said there's nothing they can do to fix whatever the issue might be,
but what I'm interested in is why it happens; if I can find that out then maybe I can
figure a workaround. I'm using LSI 1030-based PCIe cards, eg. SAS3442, SAS3800,
SAS3041, etc. I'd welcome your thoughts on the issue. Would be nice to get a Vertex4
running with a 3Gbit link in a Fuel, Tezro or Origin/Onyx.
Note I've been using the Vertex4 as a replacement for ancient 1GB SCSI disks in
Stoll/SIRIX systems used by textile manufacturers, works rather well. Despite the
low bandwidth limit of FastSCSI2 (10MB/sec), it still cut the time for a full backup
from 30 mins to just 6 mins (tens of thousands of small pattern files). Alas, with
the Vertex4 no longer available, I switched to the Crucial M550 (since it does have
proper PLP). I'd been hoping to use the V180 instead, but its lack of full PLP is an issue.
Ian.
alacard - Wednesday, March 25, 2015 - link
In my view the performance consistency basically blows the lid off of OCZ and the reliability of their Barefoot controller. Despite reporting from most outlets, for years now drives based off of this technology have suffered massive failure rates due to sudden power loss. Here we have definitive evidence of those flaws and the lengths OCZ is going to in order to work around them (note, i didn't say 'fix' them).The fact that they were willing to go to the extra cost of adding the power loss module in addition to crippling the sustained performance of their flagship drive in order to flush the cache out of DRAM speaks VOLUMES about how bad their reliability was before. You don't go to such extreme - potentially kiss of death measures - without a good boot up your ass pushing you headlong toward them. In this case said boot was constructed purely out of OCZ's fear that releasing yet ANOTHER poorly constructed drive would finally put their reputation out of it's misery for good and kill any chance a future sales.
OCZ has cornered themselves in a no win scenario:
1) They don't bother making the drive reliable and in doing so save the cost of the power loss module and keep the sustained speed of the Vector 180 high. The drive reviews well with no craters in performance and the few customers OCZ has left buy another doomed Barefoot SSD that's practically guaranteed to brick on them within a few months. As a result they loose those customers for good along with their company.
or
2) The go to the cost of adding the power loss module and cripple the drives performance to ensure that the drive is reliable. The drive reviews horribly and no one buys it.
This is their position. Kiss of death indeed.
Ultimately, i think it speaks to how complicated controller development is and that if you don't have a huge company with millions of R&D funds at your disposal it's probably best if you don't throw your hat into that ring. It's a shame but it seems to be the way high tech works. (Global oligopoly, here we come.)
All things considered, it's nice that this is finally all out in the open.