Speed of my full ssd

[boromaill]

Recently I have bought new ssd Samsung Evo 250gb and It quickly got filled with data and now its almost always at 90+ % so my question is if this state will make my ssd slower.

 

[rtwjunkie]

Yes it will. Very much so. I operate under the premise that 30% of an SSD should always be empty. Not sure if that's too much, but it keeps me safe!

 

[boromaill]

Actually I just ran HD tune pro 5.50 and it gave me maximum speeds of 380 MB/s and minimum 24 MB/s with average speed of 318 MB/s. That's not how it should be I suppose. What should I do?

 

[W1zzard]

30% sounds like a lot .. probably more than you need, as long as you have an OS with TRIM (Windows 7+)

My C: ssd .. and it's not that slow.

Oh and only writes are affected by limited disk space on SSD, reads will always be the same speed no matter how full the drive.

 

[boromaill]

So why is my write speed in Hd tune so low, with huge drops below 50 MB/s?
Crystak mark shows following results:

read write
seq 415 409
512K 353 54
4K 31 38
4kqd32 33 59

 

[rtwjunkie]

30% sounds like a lot .. probably more than you need, as long as you have an OS with TRIM (Windows 7+)

My C: ssd .. and it's not that slow.

Oh and only writes are affected by limited disk space on SSD, reads will always be the same speed no matter how full the drive.

Good to know! I try to mostly only put things on SSD that are mostly going to only get Read anyway. This gives alot more leeway.

 

[Aquinus]

You know, if most of the SSD is filled the firmware can't effectively do wear leveling. You very well could be shortening the lifespan of your SSD by keeping it full every time you do a write. NAND flash takes more time to program the more times you re-write over the same memory location. If its been full for a while you're probably harming blocks on your SSD which is your tiny bit of free space.

 

[Solaris17]

30% sounds like a lot .. probably more than you need, as long as you have an OS with TRIM (Windows 7+)

My C: ssd .. and it's not that slow.

Oh and only writes are affected by limited disk space on SSD, reads will always be the same speed no matter how full the drive.

I know your right. But I feel really anxious and i really want to delete stuff off your drive.

 

[eidairaman1]

Evo ssds have a firmware update

 

[boromaill]

So I made a firmware upgrade and the results are now much better but its still not what I expected.


-----------------------------------------------------------------------
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 : 449.261 MB/s
Sequential Write : 441.878 MB/s
Random Read 512KB : 380.792 MB/s
Random Write 512KB : 345.703 MB/s
Random Read 4KB (QD=1) : 31.556 MB/s [ 7704.1 IOPS]
Random Write 4KB (QD=1) : 60.013 MB/s [ 14651.6 IOPS]
Random Read 4KB (QD=32) : 34.214 MB/s [ 8353.1 IOPS]
Random Write 4KB (QD=32) : 85.871 MB/s [ 20964.7 IOPS]
Test : 1000 MB [C: 79.5% (185.0/232.8 GB)] (x5)
Date : 2014/11/06 14:04:12
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)


My boot time went from 15 to 8 seconds. I wonder why my qd32 read so low is.

 

[EarthDog]

Run ATTO and see if you meet the drive specs... that or compare CDM to other drives and not its rated specs.

+1 to Wizz... 30% is leaving WAY too much free space...

I wouldn't worry about writes and wear leveling with a full drive either... There are longevity tests on the web showing 10's of TB's written on drives before they crap out. I wish people would drop the writes issue as we have moved well beyond the drives of 2010 and earlier.

 

[Mussels]

samsung have a tip in their software that if you parition it with about 7% leftover, it prevents the slow downs and extends the wear of the drives.

It's pretty easy to just shrink the parition 5-10% manually (thats all the samsung magician software does) and keep the higher performance. the drive can still use un partitioned space temporarily, which prevents the performace losses of a full SSD.

 

[Aquinus]

samsung have a tip in their software that if you parition it with about 7% leftover, it prevents the slow downs and extends the wear of the drives.

It's pretty easy to just shrink the parition 5-10% manually (thats all the samsung magician software does) and keep the higher performance. the drive can still use un partitioned space temporarily, which prevents the performace losses of a full SSD.

+1: Another option could be just not filling your SSD.

 

[newconroer]

Leave about 30-40% space free, and don't do more than three full speed tests every few months. I know that all sounds a bit wonky like voodoo.
And never forget that if you aren't using singular large files, you will never see the rated performance that these companies advertise.

Writing to Crucial C300, 4gb file : 550mb/s burst, 175mb/s sustained
Writing to Corsair Vertex 4, 4gb file : 800mb/s burst, 350mb/s sustained
Writing to Seagate 7200 HDD, 4gb file : 800mb/s burst, 155mb/s sustained.

Both SSD are rated twice as fast if I recall and both are less than 50% full.
When I had the Crucial down to 5% free once before, I lost about 1/4 read performance if I recall.


Additionally, in real world scenarios I often find that a decent mechanical HD is not that far behind SSDs.

 

[EarthDog]

Leave about 30-40% space free, and don't do more than three full speed tests every few months. I know that all sounds a bit wonky like voodoo.

Unless you have some links/evidence to support that, it is 'wonky voodoo'...30-40% is a HUGE number. You can also bench to your heart's desire on an SSD, HOWEVER, repeated (back to back) benching/testing WILL SLOW THEM DOWN. You can TRIM the drive between/after tests or if there is not data, reformat it, to bring it back to full speed (this is how OCZ told me to do it when reviewing their SSDs).

SSD's are still a lot faster than HDD's in 'real world' scenarios too (but to be clear, what do you mean by real world, as all tests I have seen/done show they are a lot faster).

 

[newconroer]

You can also bench to your heart's desire on an SSD, HOWEVER, repeated benching/testing WILL SLOW THEM DOWN. You should just TRIM the drive or if there is not data, reformat it, to bring it back to full speed.

Yes he can bench all he wants, but it will (as by your own words), slow them down.

What point were you making?

SSD's are still leaps and bounds faster than HDD's in 'real world' scenarios...

Maybe something is wrong with your Cavier Black then.

 

[EarthDog]

Running a manual TRIM on the drive will bring it right back where it needs to be performance wise... was my point... and what I posted/said. Running it multiple times in a month will not affect it as TRIM will run multiple times over the course of a month.

The Caviar Black is fine... good question though.

So, again, your links to show leaving such HUGE amounts (over say 10-20%) is remotely beneficial would be great to see considering that goes against anything else I have seen and tested the past 4 years. I could have missed something though. I have seen articles state up to 25% (which is high to me), but 40% is just insane (and a waste of cash)...not to mention, mine are about 80% full and still bench darn close (margin of error) to from its empty state (using ATTO/CDM, etc).

 

[Aquinus]

40% over provision is something you might see on enterprise class SSDs for servers, but that is a bit on the high side. The simple fact is, the more space is free the better job the wear leveler in the firmware will do. It's a matter of which you think is more important and if you're doing writes a lot.

 

[Jetster]

Its the downside of SSDs. You want 10% over provisioning (unallocated) for trash cleanup and trim and don't fill the drive up say at least 30% free. To stay fast they need space

Really SSDs are great for a system you have to boot often and large maps for gaming. Other than that a standard drive is fine

And you shouldn't use HDTune on a SSD.

Most drives that are odd Gb numbers have mandatory over provisioning. Like 240, 120Gb. Where 256, 128 do not

http://www.samsung.com/global/busin...isite/SSD/global/html/about/whitepaper05.html

 

[EarthDog]

Ya'll waste a ton of space on your SSDs...

 

[newconroer]

Running a manual TRIM on the drive will bring it right back where it needs to be performance wise... was my point... and what I posted/said. Running it multiple times in a month will not affect it as TRIM will run multiple times over the course of a month.

I wasn't aware all the SSD allowed manual trimming as it were. I will give that a try myself.

The Caviar Black is fine... good question though.

So, again, your links to show leaving such HUGE amounts (over say 10-20%) is remotely beneficial would be great to see considering that goes against anything else I have seen and tested the past 4 years. I could have missed something though. I have seen articles state up to 25% (which is high to me), but 40% is just insane (and a waste of cash)...not to mention, mine are about 80% full and still bench darn close (margin of error) to from its empty state (using ATTO/CDM, etc).

I don't have any brother, it's just the trend and feel that we've gotten from these types of drives in the last ten years, where filling more than half the drive starts to degrade performance. Then again I haven't looked hard at them since these new generation of controllers have been out. You could be right and the impact is minimal.
Maybe something I should look into when I have the time to catch up!

 

[boromaill]

Btw, does a slower ssd affect gaming performance?

 

[rtwjunkie]

Btw, does a slower ssd affect gaming performance?

The only circumstances in which I see slower SSD's affecting gaming performance is in the loading of maps or levels, as @Jetster mentioned. Other than that, HDD is perfectly fine, IMO.

 

[Brusfantomet]

Btw, does a slower ssd affect gaming performance?

Only load times.

 

[newconroer]

Only load times.

It's primarily helpful for load times though random reading is important too in CERTAIN games due to how much disk access they require. I doubt you'd come across them often, but it's a small bonus in those scenarios.