Write speed always drops on Vertex 2 SSD

Vimes · 29 Mar 2011 at 14:31

I try and think on and run PD about once a month, after I have ran CCleaner.
But with my record of not bothering about leaving the PC on at night in a logged off condition to do its GC thing I tend to forget about it. However I did leave it switched on and logged off last night, prompted by this thread

Again try and remember to use ATTO to benchmark, but not too often.

Phil2008 · 29 Mar 2011 at 15:07

Anyway thanks Vimes, I will see if it solves my prob and run PD once a month. I dont use ATTO as it writes stupid amounts of data, and Ive got crystal disk to write only 100mb, but its not the true reading as crystal disk uses uncompressible data. I also never ever log off

Maybe this thread will be useful for other vertex 2 users and I'll report back in about a month or 2 to let you know if its worked or not.

Phil2008 · 29 Mar 2011 at 15:24

Ive told these guys at OCZ that you use PD and havent had any probs with write speed, and ask then if this would solve my prob.. and their reply was............

highly unlikely as the drive is designed to throttle down through the Durawrite process. I don't believe for one second that PD11 nor any other software would cicumvent this internal process short of secure erasure. If his drive has not throttled yet, then he has not filled it completely. There are only a couple of guys around here that still subscribe to the "the drive may never throttle" theory. Pretty obvious, I'm not one of them.

And as for the ability of PD11 to reduce throttling? Don't see how that would be possible since all it does is to increase the OS/logical efficiency(with slight chance of some internal trimming/remapping/consolidation at the physical level) and additional writes are obviously occuring with its usage. The writes are usually minimal but there nonetheless. And the Windows consolidation has no where near the efficiency of PD11 consolidation as I've tested them side by side. IMO, PD11 is best served to optimize images slated for backup restoration. That way everytime you flash the image over after an SE, it's nice and efficient from the start.
..........................................................

But we will see...........

Phil2008 · 29 Mar 2011 at 17:52

Vimes do you think you can run Crystaldisk plz and use the same settings as im my screen shot. If the throttling has kicked in, it will be in the double figures and if throttling hasn't kicked in, it should be 130mb upwards. As OCZ say that even if throttling has kicked in ATTO wont be much diff, but I find that hard to believe.

Heres my ATTO atm

Vimes · 29 Mar 2011 at 19:15

Here is mine...

mine seems to be "throttled". Albeit that is the very first time I have run that benchmark as I have always been under the impression that the ATTO is more applicable for our types of drives.?

Still your ATTO results are similar to mine.

I'm not sure though what are you suggesting is the implication or problem with what is happening, as in everyday use it seems fine..?
Unless you are just learning about the differences in advertising "up to" and then real life "actuals"

Phil2008 · 29 Mar 2011 at 20:10

Vimes said:
Here is mine...

mine seems to be "throttled". Albeit that is the very first time I have run that benchmark as I have always been under the impression that the ATTO is more applicable for our types of drives.?

Still your ATTO results are similar to mine.

I'm not sure though what are you suggesting is the implication or problem with what is happening, as in everyday use it seems fine..?
Unless you are just learning about the differences in advertising "up to" and then real life "actuals"

Ummmmmmm, back to square 1. Thread closed :eek:

Vimes · 29 Mar 2011 at 20:11

Phil2008 · 29 Mar 2011 at 20:38

Vimes said:
lol

I give up trying to work out these ssd's

Vimes · 29 Mar 2011 at 20:42

don't bother trying too hard. Seriously just sit back and enjoy the use of them as you have it.

It is nearly summer and the wedding is only a month or so away

reygjabla · 30 Mar 2011 at 14:30

philtorrens said:
Perhaps free space consolidation is a feature that Intel and OCZ etc could integrate into their Toolbox software in the future? Must be a reason why they haven't done so already mind

Intel has it already in their tools. It's dubbed as "optimize".

Philtor · 30 Mar 2011 at 14:33

Ahh I see. I have an OCZ Vertex just

Phil2008 · 30 Mar 2011 at 21:07

Before I ran PD, the disk map thing was in a right mess when I checked it in defraggler, look at it now..... Some bits has moved about now tho.

Phil2008 · 5 Apr 2011 at 11:35

Just dropped to 67mb in crystal disk again :mad:

but ATTO is still nice and high.

Philtor · 5 Apr 2011 at 12:03

It's better to use ATTO on the Vertex SSD's as it use's compressible data, whereas Crystal does not.

Phil2008 · 5 Apr 2011 at 12:15

Phil2008 said:

so this the speed for all uncompressible data(crystaldisk) and the speed for all compressible data(ATTO)?

jimmy321 · 5 Apr 2011 at 12:56

The sandforce firmware in your Vertex SSD compresses (and decompresses) data R/W from the drive, if the data is in a state where it can't be compressed it R/W's as is.

DragonQ · 5 Apr 2011 at 13:04

Yes. When the NAND gets to a "settled in" state (which I think is after all NAND has been written to once), incompressible writes will be throttled. Reads and compressible writes will stay the same. This is because of the DuraClass technology trying to extend the lifetime of the SSD as much as possible. The more you hammer it with incompressible writes, the slower it'll get.

You can fix this with regular backup-secure erase-restore cycles but honestly you won't notice much difference in real-world usage, providing you're using the drive as a "normal" OS drive. Incompressible writes are pretty rare anyway, unless you're writing lots of video and audio to the disk, which these SSDs aren't really designed for.