topic Re: Server load causes crash in Operating System - Linux

Server load causes crash

Digital Human — Fri, 09 Feb 2007 07:12:36 GMT

Hi there,

I have 2 proliants dl 360 g4p. Both with the exact same hardware, exact same configuration and OS. 1 server is performing great. The other one isn't. Both perform as webserver, with a total amount of 30000 visitors per minute. The first server can handle this load, the other one is hanging. On his console i see a lot of memory errors. (See attachement).

When i perform a HD read,write test on the 'good' server i estimate a 105mb/sec. When i do this on the 'bad' server i get an estimated 7.8mb/sec. Are there any more test to see what is causing this load/error/hang ?

Re: Server load causes crash

Alpha977 — Fri, 09 Feb 2007 07:46:52 GMT

Hello DH!

i was same problem with load.

But my problem was caused by a bug of web-application.

It launch a big number of mysql connection and ca. 450 threads, infact the load was 30.00 and the machine goin'crash.

Check with "sar" command or by "top" your load.

Regards.

Re: Server load causes crash

Digital Human — Fri, 09 Feb 2007 07:51:46 GMT

Hi thanks for your reply.

Well i don't think thats it. These to servers are identical twins:) same content, same OS, same software, same hardware. So, if one crashes, the other should crash to if it was a content problem.

Re: Server load causes crash

Ralph Grothe — Fri, 09 Feb 2007 09:09:37 GMT

Hi,

you wrote that you noticed a prominent difference in HD I/O performance while performing tests on both machines.
Are these ATA drives, and have you any hdparms tuned?

Re: Server load causes crash

Digital Human — Fri, 09 Feb 2007 09:22:35 GMT

No they are SCSI 320. Raid 0

Re: Server load causes crash

Vitaly Karasik_1 — Sun, 11 Feb 2007 05:52:01 GMT

can you send us output of

uname -r

and

free

from both server?