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PERC 5/i RAID Card: Tips and Benchmarks - Page 109

post #1081 of 7194
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Quote:
Originally Posted by Villainstone View Post
Well I am not sure why you feel that way, does anyone else suppose this is true. I wouldn't even think to take this advice without propper backing from the reputable members of this forum. Not trying to insult you but you are new here and have not yet established any reputation supporting your knowledge. I admit I am dumb to this stuff and that is why I am curious to know how you came to that conclusion. You could very well be right and I have no doubts about it, but an explaination is required. Can anyone explain how he came to this conclusion?
What's the performance of one SSD? I believe the peaks are 170MB/s read and 98MB/s writes on the Core V2. If you have two of them in RAID0, the best possible performance is 340MB/s read and 196MB/s writes.
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post #1082 of 7194
Quote:
Originally Posted by DuckieHo View Post
RAID0 is relatively "easy" so discrete RAID will boost performance but it won't be much. What's the performance of just drive?
It was long time ago, but if I recall correctly it was lower 80's seq read and lower 70's seq write. So, my mindset at that time (because of increasing cost of the rig) was that theoretically I should have gotten 140-150 read and 120-140 write with RAID0 but I am losing that because of crappy on-board raid. Of course, I didn't know (or may be it wasn't even there) of this card at that time and everything else meant adding 250-300$ to my cost.

Do you think I will not gain anything from this upgrade as far as my RAID0 performance is concerned? Should I just leave the NVRAID as is in that case and just use the card for newer disks and arrays (in future some time)? I mean the card's use as expansion for sata slots itself is a good value considering a max of 8 more drives can now be added.
Edited by devsk - 1/29/09 at 1:08pm
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post #1083 of 7194
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Quote:
Originally Posted by devsk View Post
It was long time ago, but if I recall correctly it was lower 80's seq read and lower 70's seq write. So, my mindset at that time (because of increasing cost of the rig) was that theoretically I should have gotten 140-150 read and 120-140 write with RAID0 but I am losing that because of crappy on-board raid. Of course, I didn't know (or may be it wasn't even there) of this card at that time and everything else meant adding 250-300$ to my cost.

Do you think I will not gain anything from this upgrade as far as my RAID0 performance is concerned? Should I just leave the NVRAID as is in that case and just use the card for newer disks and arrays (in future some time)? I mean the card's use as expansion for sata slots itself is a good value considering a max of 8 more drives can now be added.
Compare here..... Intel RAID is generally better than NVIDIA RAID and I'm using a 3xRAID0:

Single Raptor 74GB


ICH9R RAID0 w/ Caching [128KB]


PERC RAID0 (Write-Back, Adaptive-Read-Ahead) [128KB]
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post #1084 of 7194
So, I notice few things:

0. Was the single drive run from disk on the dell card or ICH9R?
1. it looks like pretty much a linear gain with hardware raid. This means I am looking in the ballpark of 120 avg.
2. the cpu usage gain is good. More cpu cycles for doing something else like gzip while backing up.
3. why did the min transfer rate during write fall so much with hardware raid?
4. It looks like transfer rates may be better under linux than windows, but I need to analyze more in this space.

After looking at the pictures, I have a feeling that this card is going to be better than my nvraid if your statement about ICH9R being better that nvraid is right.

I think its time for me to run those benchmarks, something that I haven't done for a while, all over again.
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post #1085 of 7194
Quote:
Originally Posted by DuckieHo View Post
Check the MegaRAID logs? Also, check Windows Even Viewer?
Apparently it wasn't obvious, but this ain't Windows.

And something else odd is going on. On my fresh Fedora 10 install, after I put my username and password into MegaRAID Storage Manager, the main screen is entirely blank. It worked fine on my fresh Fedora 9 install that I used to bring the array up and update the firmware last night (and burn the Fedora 10 DVD so I could install it). So I think something's wrong with Java itself, but I'm not sure exactly what.

EDIT: Yep, MSM was using its own bundled JRE which was hosed. I changed the startup script to use Sun Java which I installed myself and everything's fine.
Edited by error10 - 1/29/09 at 3:05pm
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post #1086 of 7194
Here is the 256MB test. It is definately a lot lower but still pretty good I guess.





Edited by Villainstone - 1/29/09 at 3:13pm
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post #1087 of 7194
Quote:
Originally Posted by Villainstone View Post
Well I am not sure why you feel that way, does anyone else suppose this is true. I wouldn't even think to take this advice without propper backing from the reputable members of this forum. Not trying to insult you but you are new here and have not yet established any reputation supporting your knowledge. I admit I am dumb to this stuff and that is why I am curious to know how you came to that conclusion. You could very well be right and I have no doubts about it, but an explaination is required. Can anyone explain how he came to this conclusion?
Because you are testing files that will fit entirely in the cache of the controller. So you would get similar results no matter what drives you were using as nothing is really being written in the tests.

Take a look here and see how the results differ between 32mb and the 256mb test.
http://www.xtremesystems.org/forums/...d.php?t=212503
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post #1088 of 7194
Quote:
Originally Posted by lowfat View Post
because you are testing files that will fit entirely in the cache of the controller. So you would get similar results no matter what drives you were using as nothing is really being written in the tests.

Take a look here and see how the results differ between 32mb and the 256mb test.
http://www.xtremesystems.org/forums/...d.php?t=212503
Now that makes sense TY.
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post #1089 of 7194
I'm still getting that stupid popup, every hour, on the hour. I give up; I'm going to go Read The Fine Manual.
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post #1090 of 7194
Quote:
Originally Posted by error10 View Post
I'm still getting that stupid popup, every hour, on the hour. I give up; I'm going to go Read The Fine Manual.
Why are you using Windows anway? Aren't you supposed to be a linux lobbyist...

just teasing ya...;-) I will be using Windows to benchmark as well.
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