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PERC 5/i RAID Card: Tips and Benchmarks - Page 505

post #5041 of 7150
Quote:
Originally Posted by Tempest_Inc View Post
It's not odd at all that the read speed is half of the write? I would have thought this to have been the other way around the write speed being half the read?
The cache on the controller screws with the write benchmark, but can't cache the reads.
post #5042 of 7150
Quote:
Originally Posted by the_beast View Post
The cache on the controller screws with the write benchmark, but can't cache the reads.
Thats a messed up system. you would think that reads would NORMALLY be more important than write speeds for a server environment.
 
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post #5043 of 7150
Quote:
Originally Posted by Tempest_Inc View Post
Thats a messed up system. you would think that reads would NORMALLY be more important than write speeds for a server environment.
Actually it completely depends on the setup - you would tweak the system to get best performance for the exact situation you wanted. You set up your arrays differently if you application requires high random small writes than if you need fast sequential reads for example.

And it is not by design that the cache can't do anything for this situation - how do you expect the card to accurately predict the exact data that the benchmark program will ask for, and load it into the cache ahead of time so that everything happens at cache-bandwidth speeds? Obviously it can't - so the reads come from the disks (which is slow), and the writes go to the cache (which is fast) and are written out later (which is slow).
post #5044 of 7150
Case came in yesterday... Missing only one thing: the front control panel wiring header converter. So for now, the only way I can turn the server on is to short the power sw pins on the mobo. The sad part is, the header on the mobo looks exactly the same (its a supermicro board) so i figured the converter wouldn't be necessary. Unfortunately, I was wrong. I will have to see if i can find a pinout so i can create custom wiring for it.

Man, those redundant power supply fans are LOUD. Im gonna have to move this thing into the server closet asap.

The PERC 6/i is 100% compatible with the backplane, so I am pretty happy with that. The LEDs work when disks are being accessed as expected. Overall a really cool case.
    
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post #5045 of 7150
Hmm, it appears that the 16 pin power connector was not pressed all the way into the front panel (it came pre-connected, and reversing it made one of the NIC LEDs light up, so i assumed it was just imcompatible) seems as if pushing that in abit more has made the front panel light up and its now working as intended. After getting a PWM Y adapter I can now power all 5 fans with the 4 onboard PWM connectors, and control fan speeds based on temperature.

The PSU fans are still ridiculously loud. Im trying to see what I can do to mitigate the noise on those things.

I have it in the closet now, which helps offset the noise.
    
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post #5046 of 7150
Quote:
Originally Posted by Tempest_Inc View Post
I did the BGI from the controller, therefore i was in the PERC5/I's BIOS until it said it was done. This is my First RAID controller short of an on-board software based one. So if i was an idot and didnt have to sit there please let me know : ) Where would i find the MegaRiad Manager for the Perc5/i. I did a quick search and all that turned up was links to particular cards. None referenced the PERC5/i. Also are you aware of where i can find a Windows 7 x64 F6 driver?



I don't remember if i set the array to 64K or 128K bother had good results in benchmarks to i went with one of those. It's not odd at all that the read speed is half of the write? I would have thought this to have been the other way around the write speed being half the read?



I currently have a UPS and a BBU for the Raid card. Where would i find the location to make the change you mentioned above default to 15 seconds.

I have a similar experience as tempest, I too purchased 3x F4EGs, did the firmware update and setup a raid 5, I get good write speeds, about 240 MB/s (bonnie++), but my read speed is abysmal at 80 - 90 MB/s. Now I think that raid 5 is supposed to give you slightly less than the performance of (no. of disk - 1) Raid 0 performance, ie I should be getting similar performance as a 2x F4EG Raid 0.

Of course with overheads I would expect slightly less than 2x F4EG raid 0, however I ran the test on the drives alone and I get 120 MB/s read, in a 2 disk raid 0, I get 230MB/s, thus getting 80 - 90 MB/s strikes me as being really odd.

Since Tempest had a similar experience I'm beginning to think that this is a Samsung F4EG problem, I will be changing to Hitachi 5k3000s soon and hopefully I get a respectable read performance. If anyone has anymore insight on this I would love some help, I've spent 4 days playing with the Raid settings to no avail.
post #5047 of 7150
Post an HD Tune or ATTO benchmark, and list your controller settings, systems specs & whether you have a battery.
post #5048 of 7150
Quote:
Originally Posted by the_beast View Post
Post an HD Tune or ATTO benchmark, and list your controller settings, systems specs & whether you have a battery.
I'm on linux, so i can only post bonnie++ or iozone. Settings wise I've tried 64kb, 128kb. Always write back and read ahead is disabled as linux has their own read ahead.

Phenom II X2 (unlocked to 3 cores) 3.3ghz. running perc 5/i on 16x pci-e slot, 4gb of ram.

I do have a battery and it is working properly, megacli also confirms WB is enabled.

Also one thing that might be the problem is that these drives are AFS (Advanced format, 4kb sector size), I've aligned them by starting the partition at 2048. But I'm not sure if there's some innate incompatibility with Perc 5/i and AFS. Also If it was indeed misaligned write speed should suffer as well, but write speed was very close to the expected performance.

I'll post the benches when I get home later, will bonnie++ or iozone be better?
Edited by Dorick - 3/1/11 at 11:06am
post #5049 of 7150
Quote:
Originally Posted by DuckieHo View Post
================================================== ===========================
How to Flash the Dell PERC 5/i with LSI MegaRAID SAS 8480E Firmware
NOTE: Since the card uses a Dell Bootloader, there is a possible corruption as defined in Post #1343. It is recommended that you use the Dell firmware unless it does not work. The latest Dell firmware can be found here: http://support.dell.com/support/down...id=-1&impid=-1

For the PERC 6/i, you can find the last drivers/firmware on Dell's website. Look under downloads for the "PowerEdge R900".

The latest LSI firmware (card not recognised) on some systems, where reverting to 7.0.1-0051 or (supposedly) 7.0.1-0056 should resolve the issue.

The LSI version of this card is kept more up to date with bug fixes. Also, the LSI version has more software features so might as well get the better model.

8480E Drivers: http://www.lsi.com/storage_home/prod...ex.html#Driver
8480E MegaRAID Storage Manager: http://www.lsi.com/storage_home/prod...#Miscellaneous

The Windows version is the easiest to use so I'll provide those steps:
1) Download and extract the LSI flashing utility "MegaCLI - Windows"
2) Download the and extract the 7.0.1-0061: http://www.lsi.com/cm/License.do?url...ware&locale=EN
3) Place the .ROM file in the MegaCLI folder
3) Open a command prompt window
4) Navigate to the MegaCLI directory
5) Run the command: MegaCli -adpfwflash -f [firmware name].rom -a0
Any idea if this will work with a PERC 6/i card so I can use more than 8 HDD?
Edited by Limes - 3/1/11 at 4:26pm
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post #5050 of 7150
Alright, I finally got my cables and bracket so I could install the card. However the card is not recognizing any drives. It is an Gigabyte 785g motherboard and I purchased these cables. Also, I tried with AND without and tape mod. Can someone please help me?
Edited by RAND0M1ZER - 3/1/11 at 8:52pm
    
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