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PERC 5/i RAID Card: Tips and Benchmarks - Page 291

post #2901 of 7150
Quote:
Originally Posted by rockdude14 View Post
64kb-125mb/s
128kb-169mb/s
256kb-284mb/s
512kb-359mb/s
1mb-373mb/s
2mb-371mb/s
4mb-374mb/s
8mb-372mb/s

which one of these results would be considered the most accurate
and why such a large range
and why do people that run 2.55 with a non changeable size seem to get better results
and is there a normal setting to run it on considering no one usually mentions what they run it at

sorry for lots of questions but now im curious
They are all correct.

Your disk array will perform differently depending on what you ask it to do. Changing your benchmark settings will not affect how fast your disks run. The trick is finding which setting most closely represents the way YOU will use YOUR disks. Then your benchmark results can be useful with array performance tuning.

Messing about with benchmark settings to get the highest possible sequential reads, then tuning to further enhance those sequential reads will likely hurt your performance if the settings you end up optimising for do not represent the way you use your disks. If, for example, you use your array for large media files, optimising for the large stripe sizes would be the way to go. If however you use your array for OS use then smaller stripe sizes and higher IOPS would probably be your target. Optimising for sequential reads then using the disks for OS will result in less than optimal real-world speeds, despite your chosen benchmark results saying you are running as fast as possible.

I'm afraid there is no 'one best setting' for the benchmarks - they all have their use, hence the reason why the settings are user-adjustable.
Edited by the_beast - 7/16/09 at 1:56am
post #2902 of 7150
Quote:
Originally Posted by mak1skav View Post
Two days ago i ordered 3 Seagate Savvio 15K ST936751SS from ebay.

Now i have to buy some cables for these SAS drives too. I have found some cables in ebay but all of them are using molex adapters for the power.
you need to buy cables like this:


SFF-8484 (SAS-32) Host/Controller -> 4x SFF-8482 (SAS) Device + Power

SPAN.COM - £14.03 (inc. 15% VAT)
post #2903 of 7150
Quote:
Originally Posted by rockdude14 View Post
anyone have an idea why the performance from 4 drives to 6 drives is almost identical

the first pic is 4 and the second is 6
use this http://www.iozone.org/

post #2904 of 7150
Thread Starter 
Quote:
Originally Posted by RobiNet View Post
Nice.

The peak is CPU cache?
The plateau area is the controller cache? (It would be interesting to see a PERC 5/i 256MB vs 512MB)

How long does it take to run?
Edited by DuckieHo - 7/16/09 at 10:24am
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post #2905 of 7150
Quote:
Originally Posted by DuckieHo View Post
How long does it take to run?
IOzone is what i use too. But to get a full coverage graph like the one above can take a long time depending on your machine. What I recommend to people is to remove as much RAM as possible to minimize your time running in cache. Or, in Linux, you can boot with the option "mem=512m" to limit the amount of memory available to the OS. You then want to use file sizes that exceed the amount of memory so you can get a good picture of what I/O is like once you start cache missing. (which is what you really care about as far as measuring performance from disk)
TAIPEI
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post #2906 of 7150
Quote:
Originally Posted by DuckieHo View Post
Nice.
The peak is CPU cache?
The plateau area is the controller cache? (It would be interesting to see a PERC 5/i 256MB vs 512MB)
it's not mine it is the demo image from iozone site

Quote:
Originally Posted by DuckieHo View Post
How long does it take to run?
it depends PERC 5/i on "standard" test is much faster than ICH10R
post #2907 of 7150
I have PERC5I, with 4 drives 1T. (samsung f1)
i did an extension to raid5 I did yesterday and everything was successful. What it left me just lump together the targets of the new logical drive with the old 1.8T

Start the program named ACRONIS that when the installation asked me to turn on the computer restarts.
When the computer re-lighting
After I got in my computer, I did not see the logical drive with the 1.8T and I have not access to all my files !! :'(
I have to help return the situation to a situation INTRODUCTION I have access to files with the partition of my 1.8T with all the material to be there

Please help all who can help this very important to me

Thank you in advance to anyone who can help.
Understanding and some pictures:

http://i29.tinypic.com/24ec96q.png
http://i26.tinypic.com/etxver.jpg
http://i30.tinypic.com/6tl85d.jpg

-----------
sorry for the bad english, translate from "google translate"
post #2908 of 7150
Thread Starter 
Quote:
Originally Posted by BLinux View Post
IOzone is what i use too. But to get a full coverage graph like the one above can take a long time depending on your machine. What I recommend to people is to remove as much RAM as possible to minimize your time running in cache. Or, in Linux, you can boot with the option "mem=512m" to limit the amount of memory available to the OS. You then want to use file sizes that exceed the amount of memory so you can get a good picture of what I/O is like once you start cache missing. (which is what you really care about as far as measuring performance from disk)
Don't forget Windows has the same option. You can limit the OS's memory via adding the parameter in the boot.ini. Use MSConfig -> Boot.ini -> Advanced -> MAXMEM
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post #2909 of 7150
Quote:
Originally Posted by DuckieHo View Post
Don't forget Windows has the same option. You can limit the OS's memory via adding the parameter in the boot.ini. Use MSConfig -> Boot.ini -> Advanced -> MAXMEM
Nice tip! I don't use Windows much, but that's certainly useful to know for this type of stuff.
TAIPEI
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AURORA
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ASRock X99 Extreme11 EVGA GTX 980 Superclocked 32GB 8x4GB Corsair LPX Samsung XP941  
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Dual Quad-core L5430 2.66Ghz 12mb cache Intel 5000 chipset ATI ES1000 64GB FBDIMM DDR2 PC2-5300 667Mhz 
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WD3000FYYZ PERC H700 w/ 512MB cache CentOS 7.2.1511 950W x2 
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TAIPEI
(10 items)
 
AURORA
(13 items)
 
 
MotherboardGraphicsRAMHard Drive
ASRock X99 Extreme11 EVGA GTX 980 Superclocked 32GB 8x4GB Corsair LPX Samsung XP941  
Hard DriveCoolingOSMonitor
Western Digital 3TB RE Noctua NH-D15 Fedora 21 Linux Samsung S27D590C 
PowerCase
Seasonic SS-1200XP Cooler Master Cosmos II 
CPUMotherboardGraphicsRAM
Dual Quad-core L5430 2.66Ghz 12mb cache Intel 5000 chipset ATI ES1000 64GB FBDIMM DDR2 PC2-5300 667Mhz 
Hard DriveOSPower
WD3000FYYZ PERC H700 w/ 512MB cache CentOS 7.2.1511 950W x2 
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Reply
post #2910 of 7150
Quote:
Originally Posted by RobiNet View Post
you need to buy cables like this:


SFF-8484 (SAS-32) Host/Controller -> 4x SFF-8482 (SAS) Device + Power

SPAN.COM - £14.03 (inc. 15% VAT)
I have found these cables too but i don't really like theme because you have to connect the power with molex-type connector.

I would prefer to connect the power with sata-type connectors. I have found some cables with sata power connectors and i have ordered them from Ebay and i will test them as soon as i get them in my hands.

My goal is to connect 3 Savvio 15K.1 36.7 GB drives in raid 0 with strip size 64kb for my OS and Lotro installations. I hope to see some 300+ MB/s read speed in HD Tune or Atto benchmark
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