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02-17-2011, 10:49 AM #1Junior Guru
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Testing ECC Memory on IBM eServer
Hello,
I bought a used server now 6 months ago, after I got it I did test it and install ISP Config and other tools on it, everything worked perfect but didn't send it yet to a datacenter, now I wanted to test it again because I wanted to send it but I got few
I got some errors like this from time to time on the console :
PHP Code:Corectable Errors ... CE k8_edac ...
extended error code: ECC chipkill x4 error
Now I tried with ECC_Mem: ON and it's been 6 hours since running, reached Pass 5 and no errors so far.
Can I test the RAM with something else ?
Before runing the memtest I did removed and inserted the ram again.
I have 4Gb (8 x 512mb) and dual Opteron 254 proccesors.
What do you suggest ?
PS. I did order another 4Gb ECC Ram (4x1Gb) but it will take some time until I will get the package.
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02-17-2011, 12:39 PM #2Newbie
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Well, I can tell you for sure that bad contact can result in errors.
That's 1 of the main problems in second hand servers.
I'd suggest you clean everything and then preform the tests.
Tip: when cleaning RAM contacts use white pencil eraser
Everything else - dust cleaner and paint brush (not used).
Another thing that can result in errors OR self-reboot is the power supply, and if you decide to clean it - be EXTRA CAREFUL. Even unplugged the PSU can still hold enough charge to do harm !
If you still have errors AFTER cleaning, try removing the RAM 1 by 1 and test untill you find the faulty.Last edited by Onepamopa; 02-17-2011 at 12:43 PM.
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02-17-2011, 03:54 PM #3Junior Guru
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It just passed 11 hours since memtest is running and couldn't find an error. About the secondhand thing, the server came to me in excelent condition, I was amazed how clean everything looked, they also tested the server before shipp it, I also test it with some software for server stability and I got no problem when I received it, but maybe in the months that the server was in my storage room some dust got in .. don't know what to say realy.
I think I will stop the memtest now and start the server to see if the errors are shown again on the console.
Can you tell me what software I can install on the server to test again for stability ? When I got it had windows OS and used win tools, but now I have Linux on it so I need something else.
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02-17-2011, 04:46 PM #4Web Hosting Evangelist
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Agree with Onepamopa - contacts cleaning usually returns 90% of computers back to life.
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02-17-2011, 08:17 PM #5Newbie
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You can try some benchmarking tools, check here: http://lbs.sourceforge.net/
& still it wont be a bad idea to clean it, and measure/test the PSU.Last edited by Onepamopa; 02-17-2011 at 08:23 PM.
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02-18-2011, 04:29 AM #6Junior Guru
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Thank you for that link, I have used UnixBench more than 10 times yesterday, and the day before. So far I did not get any error on the screen.
I will clean all the contacts again, but don't know how to measure the PSU. I'm very confident that the problem was the dust, as after I have removed and inserted the RAM again I did not get any error .. yet. And it past about 20 hours with memtest runing and now another 12 hours since the server was started, and the only load to it was runing the unixbench multiple times.
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02-18-2011, 09:12 AM #7Newbie
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Listen, every PSU (Power supply unit) has several years "life", after that, it could still work, but the voltages start to vary (they have to be CONSTANT). This is caused by bad capacitors. Better find someone who knows what he's doing, and test the PSU UNDER LOAD (that means - the server has to be running, the power supply will needs some load on it in order to be measured properly). Another thing... new PSU for old servers is very difficult to find.
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02-18-2011, 03:55 PM #8Junior Guru
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Now I'm testing the server with ab tool, I will post few graphs generated by munin, the load,memory, network, temperature graph was generated by the server itself, and the Power Consumption graph was generated by another computer, where the APC was connected (the APC UPS powered only one device, the server I was testing)
The server on idle, was consuming 160w and in full load ~200w (the PSU is rated at 411w / IBM 39Y7166), and load of 190.55 189.37 184.87 I think is high enough to trigger a problem, I want to test it more to use even more ram, I don't know why used memory was only ~1500 of 4000MB available, and in the memory graph generated by munin there is a commited value, of 6 - 8 Gb.
This server will be mostly used as a disc space for backups generated by a cPanel server, and probably just a few personal websites.
Bellow I will post some summary of the ab tool
Code:# ab -kc 500 -n 10000 http://www.mydomain.com/de/categories/metal-ds-range-fence-1.html This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0 Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Copyright 2006 The Apache Software Foundation, http://www.apache.org/ Benchmarking www.mydomain.com (be patient) Completed 1000 requests Completed 2000 requests Completed 3000 requests Completed 4000 requests Completed 5000 requests Completed 6000 requests apr_socket_recv: Connection reset by peer (104) Total of 6005 requests completed [root@StorageXWD ~]# ab -kc 500 -n 5000 http://www.mydomain.com/de/categories/metal-ds-range-fence-1.html This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0 Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Copyright 2006 The Apache Software Foundation, http://www.apache.org/ Benchmarking www.mydomain.com (be patient) Completed 500 requests Completed 1000 requests Completed 1500 requests Completed 2000 requests Completed 2500 requests Completed 3000 requests Completed 3500 requests Completed 4000 requests Completed 4500 requests Finished 5000 requests Server Software: Apache/2.2.3 Server Hostname: www.mydomain.com Server Port: 80 Document Path: /de/categories/metal-ds-range-fence-1.html Document Length: 0 bytes Concurrency Level: 500 Time taken for tests: 177.873843 seconds Complete requests: 5000 Failed requests: 399 (Connect: 0, Length: 399, Exceptions: 0) Write errors: 0 Non-2xx responses: 4601 Keep-Alive requests: 0 Total transferred: 12150581 bytes HTML transferred: 9514534 bytes Requests per second: 28.11 [#/sec] (mean) Time per request: 17787.384 [ms] (mean) Time per request: 35.575 [ms] (mean, across all concurrent requests) Transfer rate: 66.70 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 1360 5209.5 0 93009 Processing: 67 14082 18858.3 5437 142115 Waiting: 66 13685 18371.9 5416 140154 Total: 1627 15443 19229.6 6512 142204 Percentage of the requests served within a certain time (ms) 50% 6512 66% 10324 75% 17504 80% 25570 90% 43273 95% 50695 98% 83150 99% 105686 100% 142204 (longest request)
Code:# ab -kn 10000 -n 5000 http://www.mydomain.com/images/afis.jpg
Any other suggestions are welcome, before sending the server to datacenter.
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02-18-2011, 10:31 PM #9Newbie
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find someone what can work with measurement tools (voltmetter) and knows power supply units. it's a simple matter of measuring the voltage during load to see if there's a problem or not. Long time ago I had a PC with a PSU that outputed 4.05V (instead of 5.00V) and 11.00V (instead of 12V)... it worked.... for a time (it eventually died out cause the PSU shorted and fried the motherboard and everything...) better safe than sorry, right ?
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02-19-2011, 05:27 AM #10Junior Guru
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I have a multimeter, and tried to test the PSU, also made some pictures to see how I did it.
12+ line was constant at 12,31v never changed, and tested all the yellow wires about 1 minute, each.
5+ line was not so stable, but the fluctuation was very very small, maybe you can tell me if this might be an issue because 3 of the red wires had 5,04 - 5,03v , and one was fixed on the 5,04v - this was the only difference I could see, so 0,01v could indicate a problem ?
There is another connector with less wires, that comes from the PSU, but I could not test that too because there is no free space to insert the voltmeter
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02-19-2011, 06:21 AM #11Disabled
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I have also a query regarding used Server.
Is it safe to buy used server. Like many people I also like to buy used server because we can get it at cheaper rate.
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02-19-2011, 06:29 AM #12Junior Guru
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This was my first used server, but never got in to production so far, I want to make sure it it ok to send it to a datacenter, where will be mostly used only for backups.
I think with used equipments you have to accept the risks, as you don't know when something may fail.
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02-19-2011, 09:31 AM #13Newbie
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There are some risks when buying used servers, cause you never know in what condition they were (how they were used etc) before u got them. The best thing is to have everything tested before buying it, but that's not always possible.
@ovisopa seems like your PSU is in good working condition. I'd recomend cleaning it, but be careful !!! After that, it's safe to send it to a datacenter and start your work
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02-19-2011, 10:20 AM #14Junior Guru
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To clean the PSU I have only one option, to blow air in it, I tried to open the PSU and there is one screw under a sticker, probably it's like that for warranty, the warranty expired long ago, but I didn't want to brake the "seal" only to open the PSU and visually check and clean it.
Thank you for all you advices.
Have a nice weekend.
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