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SSD in raid 0

post #1 of 30
Thread Starter 
How fast will my SSD's wear out in raid 0? Can that performance be retained after a secure erase?
I seem to be getting some pauses in games as if stuff is being loaded. (Mass effect 3, skyrim)

Cheers.
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post #2 of 30

Your ssd's would wear out the same as if you had only 1 ssd in there, maybe even less since each drive only gets a portion of the data. Are you using Intel's latest RST?

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post #3 of 30
I guess it depends on how much you write and delete to the SSDs... They should have their own garbage collection... but it might be a good idea to secure erase. I'd invest in a 320gb+ storage/cache/desktop drive so that common writes and frequent writes can be placed there
post #4 of 30
Quote:
Originally Posted by JedixJarf View Post

Your ssd's would wear out the same as if you had only 1 ssd in there, maybe even less since each drive only gets a portion of the data. Are you using Intel's latest RST?

There's the worry about no TRIM...
post #5 of 30
Thread Starter 
But isen't the garbage collection killed after a secure erase?
When we say wear down, is it perminant?

Edit: I use IRST 10.8.
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post #6 of 30
Quote:
Originally Posted by BradleyW View Post

But isen't the garbage collection killed after a secure erase?
When we say wear down, is it perminant?
Edit: I use IRST 10.8.

Okay, so garbage collection works like this:

- You write to a SSD
- You delete from a SSD
- Windows sends a TRIM command telling the SSD that it is no longer using that sector
- if SSD supports TRIM and is NOT in a RAID0 array, when it is free, it does garbage collection and frees the space

The problem with SSDs is that they can't really tell what is being used and not being used efficiently. This will result in, after multiple writes and deletes across the drive, that, to windows, is fairly empty, but, in reality, the SSD controller sees as full, so when you want to do a new write, the controller has to, sector by sector, check to see if it can write over it.

HDDs dont have this problem because they're so slow anyways, this sector by sector inspection doesn't really affect performance. A SSD however, can go from 300 MBps read/write to 100MBps on a fully battered drive without TRIM.

Not sure what you mean when garbage collection is killed after a secure erase, but a secure erase sets every bit to 0 (essentially off) so yes, you are starting with a fresh slate and so garbage collection has nothing else to do since there's no "garbage" left on your drive until you start writing and deleting again.

However, this is only true if you write and delete a lot and it also depends on the native garbage collection algorithm, how good it is with handling non-TRIM situations.

To answer your other question, no, in this case, the performance degradation is not permanent, a secure erase should fix that (however the more deletes you do to a SSD, the faster it wears due to the voltage increase required to "zero" out the sector). A SSD doesn't really suffer performance degradation as time goes on, at least not due to failing sectors (This goes into a whole other topic on the reliability of SSDs, etc)

Hope this helped as my information is not 100% complete

edit17: pardon all the run-on sentences... I always failed "language arts"
Edited by AchuSaysBlessYou - 3/26/12 at 12:49pm
post #7 of 30
Quote:
Originally Posted by AchuSaysBlessYou View Post


There's the worry about no TRIM...


What do you mean no trim? Intel supports trim in raid now.

 

Edit:my bad, 11.5 alpha notes.

 

2. This release will not enable the TRIM on RAID0 feature, but it will be added in the next RST 11.5 release.  Contact your RST AE representative with questions.


Edited by JedixJarf - 3/26/12 at 12:50pm
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post #8 of 30
No they don't.
And TRIM is NOT garbage collection. These are two different things.
post #9 of 30
Quote:
Originally Posted by JedixJarf View Post



What do you mean no trim? Intel supports trim in raid now.

Edit:my bad, 11.5 alpha notes.

2. This release will not enable the TRIM on RAID0 feature, but it will be added in the next RST 11.5 release.
  
Contact your RST AE representative with questions.

ninja edit: but yeah, they say they will in their next release. I hope so since my Vaio Z with 3x64GB SSDs in RAID0 probably needs it
Quote:
Originally Posted by LosNir View Post

No they don't.
And TRIM is NOT garbage collection. These are two different things.

yeah, TRIM is simply a command to assist garbage collection on SSDs

however, not all firmware is created equal, so some drives do not rely on TRIM as much as others do.
post #10 of 30
Thread Starter 
@AchuSaysBlessYou
Thank you mate!

@JedixJarf
Are you sure TRIM is for Raid 0 as well? To my understanding, TRIM will work with IRST 11.5, which is not out yet.

Also, which INF should i install? Whatever is the latest? (11/27/2011)

Thank you. rep to all.
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