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TWO 128GB SSDs in RAID or one 256GB SSD?

post #1 of 9
Thread Starter 
I think I already know the answer to this buuuut I wanted to see what you all think..

Currently I own a ADATA SP600 128GB SSD that I had gotten on sale for 50$ last year. It performs nicely but is a bit slower than my Samsung 830 from yesteryear.

either way. I was thinking of raiding two of them together in my new build (in sig) or just going with one 256GB SSD and calling it a day.

But also I'm a bit on a budget so I don't feel like spending a ton of a 256GB SSD, so i am either getting a ADATA 256gb the SP900, Samsung's 850 series (assuming i stop hearing bad things about it) or something else.

I will also say one thing. The data speeds on this drive are..inconsistent depending on the PC you use.
I've used four Different machines with the ADATA drive and i get different speeds resulting in lower or higher. oddly enough with this i5 I get higher than normal speeds.

CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World : http://crystalmark.info/
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 503.525 MB/s
Sequential Write : 129.699 MB/s
Random Read 512KB : 391.173 MB/s
Random Write 512KB : 138.746 MB/s
Random Read 4KB (QD=1) : 23.351 MB/s [ 5701.0 IOPS]
Random Write 4KB (QD=1) : 69.927 MB/s [ 17072.0 IOPS]
Random Read 4KB (QD=32) : 258.978 MB/s [ 63227.1 IOPS]
Random Write 4KB (QD=32) : 133.516 MB/s [ 32596.7 IOPS]

Test : 1000 MB [C: 84.5% (100.3/118.7 GB)] (x5)
Date : 2015/03/09 17:58:15
OS : Windows 8.1 Pro [6.3 Build 9600] (x64)
post #2 of 9
256gb
post #3 of 9
I'd go with the 256GB drive for a few reasons. First, the SP600 really sucks. JMicron controller is awful. Second, RAID 0 won't increase perceived performance at all. Third, you're a lot more likely to lose your data if one dies. Check out Crucial's drives. MX100 is about $100 for 256GB. SP900 isn't bad either if the price is right, and it's pretty similar to PNY's XLR8 and Optima if those are cheaper.
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post #4 of 9
RAID on SSDs is pointless, gives you less 4K speeds which are the most important for OS snapiness, longer boot time due to the initialization of the RAID Controller on startup, and higher risk of data loss!

http://www.overclock.net/t/1500862/1-single-ssd-vs-2-ssd-raid-0
Quote:
Originally Posted by Sean Webster 
If you have a workload in which you need high sequential speeds, then in that case you are good to go with a RAID 0 array. Otherwise, RAID 0 with SSDs is pointless besides having a bit more e-peen. The numbers don't lie, but they can be deceiving...remember, these are synthetics tests, not real world workloads. Just because you see 1GB/s bandwidth capability, it doesn't mean you necessarily will take advantage of it in actual use. You are right, "right choice is the one the individual decides is best for his/her application." However, many have little knowledge on the matter and can not make make an educated decisions. Thus, they have to turn to those with knowledge on the subject for educated advise. Otherwise, you end up losing time and money over uneducated decisions.
==============================================
I've used Samsung 850 PROs in RAID 0 mode, believe me there is 0 difference between RAID 0 and a single SSD when it comes to the performance that a normal user would experience because RAID 0 mode doesn't improve on the 4K random reads/writes which is what a normal or even power user would use most of the time, it only helps in sequential reads/writes, say for instance if all you do is copy large video or data files (10GB ++) all the time from one partition to the other which I doubt that you do....

RAID 0 mode is great to show off high benchmarks, but for a normal user, it only increases the risk of failure, higher latency, longer boot times due to the 2 - 3 seconds required for the RAID controller at startup, just not worth it, get the largest single SSD that you can afford and be done with it

Excerpts from the Samsung SSD Whitepaper
Quote:
"... Fast sequential speeds allow for quick file copies and smoother performance when working with large files, like videos. However, it is random performance, measured in Input/Output Operations Per Second (IOPS) that is, perhaps, the most important performance metric for SSDs.

A large portion of storage activity is made up of 4K random writes, a metric that measures how well a drive will perform when writing small chunks of random data (e.g. changing a small piece of a Word or text file and then saving the changes). Users spend a majority of their time not copying large files or installing applications, but multitasking (e.g. email, web-surfing, listening to music, etc.) and working with various work and media files - tasks influenced by IOPS. An SSD can offer up to a 200x improvement in IOPS over a traditional HDD (results may vary based on HDD model).

For this reason, Samsung put a heavy focus on random performance when designing its SSD lineup, offering users industry leading Random Performance of up to 100,000 IOPS. This is performance for the real world; performance you will notice and appreciate every day ..."



"... most consumer workloads will be similar to 4KB data at QD 1 ..."



"... While the majority of client PC workloads will not exceed a QD of 1, some usage scenarios may generate a QD of 2-6 or even up to 10 (in limited applications). Data center applications, on the other hand, may generate massive numbers of Input/Output (I/O) requests, creating a QD of 32, 64, or even 128 in some cases (depending on the number of access requests per second) ..."



"... For the vast majority of users, the most meaningful Iometer scores will be those of 4K random Read and Write performance at a Queue Depth of 1-32 ..."



"... The most common queue depths to test are a Queue Depth of 1, which is typical of light consumer workloads, and a Queue Depth of 32, which is representative of a heavy workload as might be seen on a on a server (e.g. web server, database server, etc.) ..."




"... peak speeds are not a good indication of everyday performance. Users are typically not installing applications or copying massive files on a regular basis. Many manufacturers like to brag about peak performance ..."
post #5 of 9
few things wrong there.

It doesn't increase latency. It doesn't lower 4K read or writes. It reduces latency (just run any bench that tells you that) and it increase 4k QD1 writes. The only thing it doesn't do is help with 4K QD1 reads which is of course the most important part and yes it increase your boot time dramatically by ~1 second. Oh.. and I see so many threads where RAID0 owners complain how their data has been lost because RAID stopped working.. nope. Don't see those.

Anyway, I'd buy the 256GB drive.
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post #6 of 9
Thanks for the correction sir thumb.gif
post #7 of 9
Question regarding RAID 0 in relation to hybrid drives.

I'm building a box with two 1TB 840 EVO ssd, two 512GB and one 2TB WD hybrid drives.

Would running RAID 0 on the hybrids be beneficial?

My main use is games and multimedia. I may get into video in the near future.

SS
post #8 of 9
Quote:
Originally Posted by ssiperko View Post

I'm building a box with two 1TB 840 EVO ssd, two 512GB and one 2TB WD hybrid drives.

Would running RAID 0 on the hybrids be beneficial?

My main use is games and multimedia. I may get into video in the near future.

Unless you're planning on using it for, say, capturing losslessly compressed HD video game footage, no, not really.
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post #9 of 9
Quote:
Originally Posted by rui-no-onna View Post

Unless you're planning on using it for, say, capturing losslessly compressed HD video game footage, no, not really.

Sound like I'll have 6 drives shown in explorer instead of 4.

Thanks!

thumb.gif

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