Questions tagged [diagnostic]
71 questions
25
votes
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.
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Steve Bennett
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11
votes
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…
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Andreas Gohr
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10
votes
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…
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barfoon
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9
votes
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…
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Grant
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8
votes
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…
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nachito
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8
votes
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.…
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Steve Bennett
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8
votes
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.…
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ewwhite
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8
votes
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…
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DaveBurns
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8
votes
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…
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The Shurrican
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7
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3 answers
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…
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ya23
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6
votes
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…
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Nate
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6
votes
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…
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Alexander Farber
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6
votes
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.
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kristof
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4
votes
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…
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Colin Coghill
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4
votes
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…
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Kevin
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