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TOPIC: SSD RAID0 alignment and optimization

SSD RAID0 alignment and optimization 1 year 7 months ago #179

  • analogo
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hello :)

looking for some help in optimizing my RAID0 based on 2x chronos 240GB. partitions were restored from single SSD image (aligned to 4K) and the raid array stripe size was left at default (32K). I believe those things are off a bit as I get horrible speeds in benchmarks like AS SSD or CrystalDisk (in ATTO it looks OK), pretty much same or worse than with a single drive :D

I am planning on re-creating the raid array with 128K stripe size this time, is that OK or any disadvantages?
Might use Paragon Alignment tool too for optimization of the rest later.

Also, can anybody confirm Mushkin Chronos 240Gb SSD's NAND Erase Block Size (e.g. 512K) and Page Size (e.g. 4K)?
I am trying to double-check my results with this tool and it calls for that information:
www.techpowerup.com/articles/other/157

Thanks for suggestions!

EDIT:
re-created RAID0 on 2x Chronos 240GB (fw 5.0.6 & 5.0.7) using recommended 128KB strip, also enabled Write-Back Cache in IRST 11.5, here's my ASSSD benchmark, why it shows such low numbers?


Running OROM 11.0

The firmware information on disks (screenshot taken from before they were raided):


Uploaded with ImageShack.us

Also, I'm kinda worried about Partition offset number, looks kinda odd (844800), shouldn't it be something like 1048576 or so?

Also I have run Paragon Alignment Tool 4.0 and it says all partitions are optimally aligned (except for Service GUID partitions that can't be changed) ... shouldn't I see some better numbers at 500+ ?

EDIT2:
for comparison here is RAID0 from other computer (not mine) running same board, 2x 256GB Samsung 840 Pro SSD, strip size 128K, much higher numbers:


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"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle
Last Edit: 1 year 6 months ago by analogo.
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SSD RAID0 alignment and optimization 1 year 7 months ago #185

  • MushkinSean
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Those are Chronos drives, they typically get a total score of around 1000 in AS SSD in RAID 0, a pair of Deluxes would get 1300-1400. So your score in AS SSD is normal

Your alignment is fine, remember that AS SSD shows where C: starts in K.
So you must have 825MB of partitions before C:
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SSD RAID0 alignment and optimization 1 year 7 months ago #186

  • analogo
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Sean, are you telling me that regular Chronos drives perform just that bad in RAID0? hmmm ... it's pretty said LOL, they seemed pretty robust to me in AHCI mode ...

I reinstalled win8 in UEFI mode (from USB stick) onto empty RAID0 volume and performance went up, not by much, but this is the best I can get with 11.0 OROM and 11.7 IRST:


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... and so to sum this up. can you confirm that Samsung 840 Pro in RAID0 can run 2 or 3 times faster than Mushkin Chronos as per AS SSD benchmark? that's pretty lame for chronos if you ask me LOL... might sell them after all and go with Samsung during some promotion ...
"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle
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SSD RAID0 alignment and optimization 1 year 6 months ago #190

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Sean, I am not posting this to bash Mushkin, just trying to figure out my problem, because I have just found another confirmation (a pair of OCZ Vertex3 SSD 128GB) doing over 900MB/s in raid0 on sequential read (mine never goes above 400MB/s in raid0 mode, and in single AHCI mode it goes over 500MB/s).

here is 2x OCZ Vertex3 128GB SSD on same board like mine (ASUS MVE), same BIOS, same OROM, same IRST driver 11.7 (I tested a few of them, same problem always for me):


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So that being said, either firmware 5.0.6 can't really run with other drive carrying 5.0.7 in raid0 mode (unexpected slow Read speeds, slower than in single drive mode while they should get doubled) or something is wrong on my board (RAID controller, OROM corrupted, etc.).

I ask again, is there any way I can flash both my SSDs to the very same number of firmware just to rule this out?
not happy about having mismatched fw, because currently my raid0 array gets broken every time I flash BIOS (not the case normally) and second (new) drive always gets kicked out from RAID and ends up being assigned with non-raid disk status. very annoying in RAID0! this is what I see in OROM after every BIOS reflash or switch between BIOS1 and BIOS2 on Asus maximus V extreme board (1707 BIOS with 11.0.0.1339 OROM):


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I am one step from sending this drive back to newegg as IMHO it is defective and can't run in RAID0 mode. might also go with different brand of SSD if you can't provide further assistance to this problem... this is annoying like hell ...

EDIT:
this is benchmark of my older chronos 240GB, running in same environment as before, just as single drive (but in RAID controller mode), as you can see sequential Read goes over 500MB/s while in RAID0 it was dropping below 400MB/s - quite unusual considering that SSDs in RAID0 usually double that value ...



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sent back the new SSD for exchange, hopefully the new one runs better. just staying worried about 2 things:
a) firmware version mismatch causes the RAID drop out on secondary drive maybe? are you sure the only thing changes in 5.0.7 was the signature range?
b) my board has a problem with RAID0 in general, so to get it double checked I will put 2x WD black 1TB in raid0 tomorrow and see if the array survives a BIOS reflash. otherwise it smells like board trouble and possible RMA with ASUS ...
"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle
Last Edit: 1 year 6 months ago by analogo.
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SSD RAID0 alignment and optimization 1 year 6 months ago #195

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Something weird going on for sure, your AS SSD scores for the Chronos array matches almost exactly for total score with the other sandforce drives.

Did you test the new drive by itself to see what it was getting in ATTO and AS SSD as a single drive?
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SSD RAID0 alignment and optimization 1 year 6 months ago #197

  • analogo
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MushkinSean wrote:
Something weird going on for sure, your AS SSD scores for the Chronos array matches almost exactly for total score with the other sandforce drives.

Did you test the new drive by itself to see what it was getting in ATTO and AS SSD as a single drive?

yeah, I did test ATTO on both and they were nearly same. actually new drive appeared a tad better since it was not an OS drive when I did the test.
the drive on left is the older chronos 240GB running 5.0.6 fw, the drive on right is the new chronos 240gb running 5.0.7 fw:


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I'm afraid I haven't tested it with AS SSD or CMD though. haven plenty of such tests for primary drive, but none for secondary since I almost immediately switched to raid0 ... ATTO for either of them looks nearly same however.

anyways, I sent this drive back to newegg for exchange, had my suspicions about it (TRIM lag and dropping out of raid0), still hoping it was just a flakey SSD or otherwise didn't appreciate running in radi0 with my older drive.

Sean, Is it possible that Seq Read slow down in raid0 is related to UEFI Secure Boot (EFI SATA Driver module and OROM) and/or GPT based OS installation? I find it hard to believe, but something is up for sure and I'm going bald headed about it LOL.

Sean, is it possible for you to fire up two Chronos (non-deluxe) drives on any Z77 platform and see what speeds you get in single AHCI mode and in RAID0? test it with 64-bit win7 or win8, no matter, they are pretty identical in performance. I'm worried that the issue is related to firmware mismatch (5.0.6 vs 5.0.7) or generally those drives perform such poorly in raid0 (even though they look awesome in single drive mode)... not sure if I want that chronos raid0 after all now...

Just to make sure, this is how my older chronos 240GB (non-deluxe) runs for me in benches, it's all pretty nice and consistent in single drive mode:


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Will play around with spare pair of HDDs in raid0 tomorrow using same cables over same ports, just to rule out any MB related problems. regular HDD should also benefit in sequential read speeds in raid0 mode over single ahci mode, yes?
"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle
Last Edit: 1 year 6 months ago by analogo.
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