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SSD: TRIM / Garbage Collector?

post #1 of 9
Thread Starter 
OK, I know what TRIM does and I have W7 Pro x64 running in this drive (http://www.newegg.com/Product/Produc...82E16820211485) and "Aligned" to 64 on an HP Laptop and it boots great and fast.

I also know TRIM doesn't work on a RAID set of 2 SSD's in a RAID of any type.
I think everyone knows that the latest Intel update only supported TRIM on an SSD that is not in a RAID disk group but attached to the same card but as a "Standalone Drive".

What I have no clue in is what Garbage Collector does other than cleanup the SSD. More importantly is, Will the "Garbage Collector" feature work properly/by design for an SSD that has that feature when it is in a RAID 0 group?

I am planning to purchase 2 of these:
http://www.newegg.com/Product/Produc...82E16820226171
and put them in a RAID 0.

Thanks
Edited by Dookie_Brown - 12/6/10 at 2:35pm
post #2 of 9
Garbage collection does the same thing as TRIM, but in a slightly different way. Garbage collection works when you are in RAID. The C300 has a very aggressive garbage collection.
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by maximus20895 View Post
Garbage collection does the same thing as TRIM, but in a slightly different way. Garbage collection works when you are in RAID. The C300 has a very aggressive garbage collection.
How did you gauge "Aggressive"?
In comparison to what?
When does "Garbage Collection" occur and how fast is it?

Sorry about all the quesitions. I'm still new to SSD's and ignorant to some features.
My implementation is on 2 test Virtual SQL 2008 x64 Servers on an vSphere platform.

Thanks
post #4 of 9
It's more aggressive than the Sandforce drives. When you put it in RAID, the lack of TRIM doesn't have as much of an effect as other drives since Garbage collection on the C300s are more aggressive. They do the job better I suppose.

http://www.anandtech.com/show/2829/14
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post #5 of 9
AFAIK, as long as you leave your computer to idle for a few hours, garbage collection (GC) will kick in. Do this often enough (once a week should be enough, I think), and you'll be fine.

As for Sandforce and the C300, the Mushkin you're looking at has a Sandforce controller, which has good GC. But the C300 is more aggressive in comparison to any Sandforce drives which, IIRC, is because it's designed to be used on SATA-III controllers which don't have TRIM support.
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post #6 of 9
That might be the reason it does have a more aggressive garbage collection. I never though of that.

Here are two setups. The C: drive is a C300 128GB in RAID and the D: drive is the OCZ vertex in RAID which is the same thing as the mushkin as they use the same controller.

Look at the difference.

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post #7 of 9
that is the reason and i have stated it a lot, the engineers stated that they made garbage collection aggressive because many people woudl use it in sata6g which at this time does not have trim support, they didn't do it for fun.

The difference between a sandforce drive's GC and C300 GC, is that GC on the c300 works much faster, on sandforce its much slower, but it is still there.
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post #8 of 9
Thread Starter 
Quote:
Originally Posted by maximus20895 View Post

Here are two setups. The C: drive is a C300 128GB in RAID and the D: drive is the OCZ vertex in RAID which is the same thing as the mushkin as they use the same controller.

Look at the difference.
Bro, those are some SICK speeds!!!! Mad props to you!
There's no way of getting those #'s on a laptop though....lol

The rig I want to put together is for Fast specific build of Virtual SQL servers. Disk i/o is demanding, especially in the write performance. In SQL, every write/update or delete is written twice. Once to the data file and simultaneously to the Transaction log file.

So, knowing that, here's my last question....

If "Garbage Collection" occurs when disk is "idle", how effective is it on a Virtualization host where idle times are rare? and in production very very rare.
I'm starting to think SSD's are not ready for Virtualization prime time, at least down to the LAB level with the commodity types I am looking at.

Maybe TRIM will be a better solution if/when the H/W RAID codeheads get their acts together. In the mean time, I'll batter the hell out of the 2 disks we're going to order for "R & D Purposes".
post #9 of 9
Those are not my speeds they are someone else's. I guess I should of given credit :/

Here is the post: http://www.overclock.net/9983989-post144.html

I would think since you are doing SQL and other stuff that they are not at their prime, but let's see other people say.
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