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Questions tagged [diagnostic]

71 questions
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3 answers

How to test a connection without telnet?

I'm trying to test whether machine A can connect to machine B on certain ports. The sysadmins of machine A have seen fit to remove the telnet command. What would be a convenient replacement? Machine A is CentOS.
Steve Bennett
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11
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3 answers

How to diagnose frequent segfaults

My server is logging frequent segmentation faults to /var/log/kern.log in different tools. So far I've seen them in Perl, PHP and rsync. All installed software is up-to-date Debian packages. Here's an exerpt from the log file: Mar 2 01:07:54 gaz…
Andreas Gohr
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10
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10 answers

Linux - Is there any way to identify the speed of your memory through software?

Is there any way to identify the speed of your memory through software? I am on Fedora 9 and looking to find out the speed of the DIMM's I have in there currently. I have tried a 'lshw' but it doesnt display the speed. I know the motherboard…
barfoon
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9
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2 answers

Diagnosing slow active directory logins

I'm having a hard time diagnosing intermittent slow logins on domain PCs. A bit of information about the network that has this problem: My domain spans 5 sites, all with VPN connections. DCs are a mixture of 2003, 2008 and 2012. Domain functional…
Grant
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8
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1 answer

Identifying what caused a server reboot

I have an HP ProLiant DL380p Gen8 that is running VMWare ESXi 5.5. It has been rebooting itself at seemingly random intervals for the past 24 hours. There is only a single VM running, and even if I shut it down the host will still reboot. The server…
nachito
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8
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2 answers

Why is Postgres sitting 95% idle, with no file I/O?

I have a TileMill/PostGIS stack running on an 8 core Ubuntu 12.04 VM on an OpenStack cloud. It's a rebuild of a very similar system which was running nicely on very similar hardware (same cloud, but different physical hardware, I believe) last week.…
Steve Bennett
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8
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5 answers

Methods for analyzing Red Hat sosreport output?

For some time (since EL 4.6), Red Hat has embedded a system report and troubleshooting tool into the operating system. The tool, sosreport, collects system information and settings and bundles it into a tar.bz archive for easy distribution.…
ewwhite
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8
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10 answers

Diagnosing permission problems with Cobian Backup to network share

I'm running the latest Cobian 11. I have a Synology DS412 NAS. All of my machines (Mac and Windows) access this just fine when I'm logged in and I browse to it manually. I have Cobian installed as a service on two Windows machines: WinXP SP3 and…
DaveBurns
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2 answers

How to interpret traceroute / output of MTR?

I have been running MTR to/from one of my servers and noticed something that looks odd to me. Because I am not really into this I will give you three outputs: This is from the server to my home location: My traceroute [v0.75] prag341.server4you.de…
The Shurrican
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How to troubleshoot Windows? Post your checklist

There is sometimes a situation when Windows suddenly goes crazy: is slow, unresponsive, some things don't work, it crashes. I wonder how do you approach diagnosing those issues. I'm merely a programmer, not really knowing Windows too deply. There is…
ya23
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6
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1 answer

determining free memory from command line on Windows

I would like to monitor the free memory on four machines each running Windows Server 2003 R2 SP2 64-bit. Each box has 31.7gb of RAM. I would like to periodically run a command line tool so I can collect the output and later make charts with it. I…
Nate
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6
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1 answer

How to troubleshoot a hanging Linux machine

There is this popular job interview question: Given a machine hangup (let's say RHEL) how do you trouble shoot the problem? My answer would be: 1) I'd use (what is the name of that server BIOS which allows you to connect to its console?) or go down…
Alexander Farber
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6
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8 answers

Free Tools for Hard Drive Diagnostics

Are there any free tools available to perform hard drive diagnostic? I have an old 3.5 IDE Samsung HDD which I use as an external drive through USB connection. I recently started to have problems with accessing some of the data.
kristof
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3 answers

How do I detect what is changing file ownership on Linux?

I have inherited a bunch of Linux (Ubuntu Precise) servers and am currently having problems with the ownership of a folder changing to "root" fairly often. We run puppet, which changes the ownership to the user it should be, but something else…
Colin Coghill
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4
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1 answer

Is there a complete reference for HP's diagnostic port 84 and/or port 85 codes?

The HP ProLiant DL580 systems (G5 is the one I'm interested in at the moment) have a two-digit 7-segment display on the system board (visible only inside the chassis) which displays various diagnostic codes which they refer to as "port 84" or "port…
Kevin
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