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[Official] Samsung SSD750/830/840/850 Owners Club - Page 176

post #1751 of 5733
Exactly. I have one application I am going to move to SSD. I have databases with millions of records with some redundant and dependent data that I need to Cross check. Dump periodically backups of them to disk an do millions of cross checks. That requires a couple of sequential writes and lots of random small reads, Even a TLC would do I think.

In any case, thinking out loud here, it seems to me that OP is most useful in the following scenarios:

1. TRIM is not supported. This could be a motherboard that doesn't support TRIM in Rais 0 or a controller like the Marvell that doesn't support it.
2. A constant workflow of random writes and reads.
3. Operating near the capacity limit of the drive

and this is not enterprise specific

Cheers
post #1752 of 5733
Quote:
Originally Posted by GeneO View Post

Yeah, I follow that thread and had seen the 840 failed unrecoverably. But how is that related to over-provisioning - was it over provisioned during the torture?

I have a real interest as I am about to use some SSD in some enterprise applications (though I won't use TLC).

I think I do understand that if you have TRIM, OP only improves write performance with more intensive work loads where garbage collection can't keep up or if the drive is near full, otherwise your just as well off with now OP as long as you leave enough spare space on the drive.

Have you ever read any of the SSD reviews and articles at Anandtech? They have done reviews of enterprise SSDs, and tests of consumer SSDs used in enterprise usage situations. Their review of the new Intel DC S3700 enterprise SSD may be helpful.

So the 120GB Samsung 840 expired in that test after, 443,309.73 GiB (432.92 TiB) of data was written to it.

That is ~121.5 GiB a day for 10 years. That's about one write to that drives entire capacity every day for 10 years. I'd hardly call that low endurance.

I'd love to see this type of testing done to a standard HDD.

Those guys testing SSDs like that are doing great work, and I salute them! thumb.gif But their discussions about the drive's failures is just conjecture IMO. You can't know why a drive failed unless it is tested in a lab. A capacitor, support chip, etc, may have failed, while the NAND chips might still have some life in them.
post #1753 of 5733
Quote:
Originally Posted by parsec View Post

Have you ever read any of the SSD reviews and articles at Anandtech? They have done reviews of enterprise SSDs, and tests of consumer SSDs used in enterprise usage situations. Their review of the new Intel DC S3700 enterprise SSD may be helpful.

So the 120GB Samsung 840 expired in that test after, 443,309.73 GiB (432.92 TiB) of data was written to it.

That is ~121.5 GiB a day for 10 years. That's about one write to that drives entire capacity every day for 10 years. I'd hardly call that low endurance.

I'd love to see this type of testing done to a standard HDD.

Those guys testing SSDs like that are doing great work, and I salute them! thumb.gif But their discussions about the drive's failures is just conjecture IMO. You can't know why a drive failed unless it is tested in a lab. A capacitor, support chip, etc, may have failed, while the NAND chips might still have some life in them.

I ran across the Anadtech articles the other day, thanks. I agree, I think these guys at Xtremesystems are doing a great service measuring the endurance of these drives. Yeah, that 840 failure could have been a one-off.
post #1754 of 5733
Actually another poster was testing an 840 120. From what I understand his died much sooner than Canthearu's, though he hasn't given any data on the one he was testing.

While typing that I was sucking on a date seed and swallowed it doh.gif That's the last time I suck on a date seed while typing on these forums, my stomach feels really weird now.
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post #1755 of 5733
Quote:
Originally Posted by parsec View Post

Have you ever read any of the SSD reviews and articles at Anandtech? They have done reviews of enterprise SSDs, and tests of consumer SSDs used in enterprise usage situations. Their review of the new Intel DC S3700 enterprise SSD may be helpful.

So the 120GB Samsung 840 expired in that test after, 443,309.73 GiB (432.92 TiB) of data was written to it.

That is ~121.5 GiB a day for 10 years. That's about one write to that drives entire capacity every day for 10 years. I'd hardly call that low endurance.

I'd love to see this type of testing done to a standard HDD.

Those guys testing SSDs like that are doing great work, and I salute them! thumb.gif But their discussions about the drive's failures is just conjecture IMO. You can't know why a drive failed unless it is tested in a lab. A capacitor, support chip, etc, may have failed, while the NAND chips might still have some life in them.

If you read they state that once the first cell of a TLC drive goes bad then it means the drive is dying. You are right that it could be some sort of a bug or anomaly with the controller because it is odd that the drive dies from a few bad cells only, especially as up to 8GB of the drive has been set aside for OP.

I am not bothered about the life span of these TLC drives at all, which is why my next SSD will be a 840 250GB. Originally I was writing about 20GB/day when I was benching the drive extensively. Now that I've not ran a benchmark in days I am almost down to 12GB/day. I am now looking at putting in my will that I wish to be cremated with this drive biggrin.gif

What I would like to know is how MLC drives perform in real world situations. Is there a noticeable difference in performance or is it mostly placebo?

Edit: almost swallowed another date seed. OCN what are you doing to me?
Edited by Liranan - 2/2/13 at 8:51pm
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post #1756 of 5733
Quote:
Originally Posted by Mang0 View Post

nevermind my 840 Pro failed 2 days later with a bunch of BSODs

Hello mate. I have the same problem. Low iops on samsung 840 pro 256GB. Hopefully mine is not going to die. Maybe someone else has any idead where might be a problem?

I've got latest AMD sata drivers, done all the tweaks. Tried Samsung SSD Magician optimization. Nothing helped. Does someone else experience the same problem? Thank you for any information!
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post #1757 of 5733
Quote:
Originally Posted by aidas View Post

Hello mate. I have the same problem. Low iops on samsung 840 pro 256GB. Hopefully mine is not going to die. Maybe someone else has any idead where might be a problem?

I've got latest AMD sata drivers, done all the tweaks. Tried Samsung SSD Magician optimization. Nothing helped. Does someone else experience the same problem? Thank you for any information!

Hi!

Your results seem normal to me.

Are you comparing your results against an Intel based raid controller ?

As if you are they are not comparative to an AMD sata controller.

You dont have a signature, so cant tell what you are running ....
post #1758 of 5733
Quote:
Originally Posted by mongoled View Post

Hi!

Your results seem normal to me.

Are you comparing your results against an Intel based raid controller ?

As if you are they are not comparative to an AMD sata controller.

You dont have a signature, so cant tell what you are running ....

I'm comparing to Intel and AMD based raid controllers. To me IOPS look unreasonably low.
Read and Write IOPS are ~50-60K. It's nowhere near advertised 90-100k.

Ok, I just updated my signature with my rig. Thanks for pointing it out!

Aidas
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post #1759 of 5733
Have you got any example screenshot of AMD Sata Controller with 840 Pro which has significantly higher IOPS than yours ?

What frequency is your 955 ?
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