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75
votes
2answers
31k views

What exactly do the colors in htop status bars mean?

By default, htop shows colored status bars for processors, memory, and swap. From left to right, the bars are colored green, blue, yellow, and red depending on some thresholds. What does it mean when ...
36
votes
10answers
10k views

How to [politely?] tell software vendor they don't know what they're talking about

Not a technical question, but a valid one nonetheless. Scenario: HP ProLiant DL380 Gen 8 with 2 x 8-core Xeon E5-2667 CPUs and 256GB RAM running ESXi 5.5. Eight VMs for a given vendor's system. ...
26
votes
6answers
1k views

Top-like tool for IP traffic [closed]

I need to keep watch on how much bandwidth some connections are taking in a server, and I know I have seen a top-like tool for that before. However, I can't remember the name of the tool, and I'm not ...
22
votes
5answers
20k views

How passively monitor for tcp packet loss? (Linux)

How can I passively monitor the packet loss on TCP connections to/from my machine? Basically, I'd like a tool that sits in the background and watches TCP ack/nak/re-transmits to generate a report on ...
16
votes
4answers
10k views

How to reset munin graphs

I'd like to reset all graphs for a certain host in Munin. Anyone who knows how I can do this?
14
votes
16answers
10k views

Real time monitoring of MS Windows servers and their services

We have a bunch of large HDTVs in our monitoring office keeping an eye on all of our production equipment. We are monitoring: Cisco routers HP switches HP proliant servers Windows 2003 IIS SQL ...
13
votes
4answers
4k views

Finegrained performance reporting on svchost.exe

This is something that's always bothered me, so I'll ask the Server Fault community. I love Process Explorer for keeping track of more than just the high-level tasks you get in the Task Manager. But ...
13
votes
13answers
9k views

Simple tool to graph memory usage?

Is there a script that will show memory usage as a graph, for example as a pie-chart, with each process being being a separate slice? I'm not looking for something like Munin to graph memory usage ...
11
votes
2answers
9k views

What is “a lot” of Page Faults?

I am monitoring the memory object in Windows 2k8, and am tracking the Page Faults/sec counter. Is there any threshold to determining what is an excessive amount of page faults? Or should I be more ...
11
votes
6answers
32k views

Weird memory usage in Windows Server 2008 R2

I hope someone can help. We've got a Windows Server 2008 R2 machine with 16GB of RAM that keeps getting all its available memory eaten by something. Nothing in Task Manager or Resource Monitor reveals ...
11
votes
2answers
969 views

How do you monitor the performance of a character device (e.g. tape drive)?

There are many ways to monitor block device performance: dstat and iostat, heck, even sar will give you data on block device I/O rates. Unfortunately, I don't know of any good spur-of-the-moment ...
10
votes
2answers
465 views

What's difference between monitoring, tracing and profiling?

I have seen these three words showing up a lot, but don't understand the exact differences between them. For example, collecting CPU utilisation is often called profiling and can also fall into ...
9
votes
3answers
2k views

Determining VM doing I/O on a Hyper-V host

How do I find out which VM is responsible for the majority of the I/O I see with Hyper-V? The situation: I do have Hyper-V hosts with a number of VMs (around 30 per host) where I occasionally see ...
9
votes
7answers
3k views

Best tool for monitoring backups, etc. and trending statstics from that data [closed]

I have done some research on nagios, opennms, and zenoss but am not confident that I have found what I am looking for. The main driving force for me right now is being able to monitor backups. This ...
7
votes
11answers
1k views

Is there tool that will monitor or log speed of web server responses

I have GNU/linux Box (linode VPS running Debian) with PHP, Apache, MySQL and Varnish (and app/site that use those) is there a tool that will save or monitor load times of web server responses?
6
votes
9answers
4k views

Linux: How to find out whether the harddrive is causing a bottleneck?

I'm not asking how to find out where a bottleneck is. I just what to know how to check if the harddrive is being used at its limit (and hence causing a bottleneck). Something like top where I can see ...
6
votes
7answers
7k views

A simple option for graphing CPU usage on a remote Linux Server

My requirements are very simple. I need to graph the CPU usage on a remote Linux server. I'm not looking for anything complicated, I just need to be able to plot the CPU usage on a Linux server over a ...
6
votes
4answers
6k views

Gigabit ethernet generally faster than Firewire 800?

If I want to transfer a large file between two computers, which are connected via LAN, would going through the network (setup as gigabit ethernet) be faster than using a direct Firewire 800 connection ...
6
votes
5answers
6k views

How to fine-tune our MySQL server?

MySQL is not my thing, yet I need to fine-tune one of our servers. Here are the requirements/specs: The MySQL server has only one significant database We only have one "type" of application ...
6
votes
7answers
390 views

*nix measure memory usage

i'd like to measure the total memory (like RAM) used by a program during its execution. Ideally, something like time that runs the program and print stats when it exits. Is there such a standard tool ...
5
votes
9answers
3k views

Linux Server Performance Monitoring

I'm looking to monitor performance on my Linux servers (which happen to be Centos). What are the best tools for monitoring things in realtime such as: Disk Performance I/O, swapping etc.. CPU ...
5
votes
3answers
3k views

What is the closest equivalent of “load average” in Windows available via WMI?

Linux has a notion of Load Average which is defined as: System load averages is the average number of processes that are either in a runnable or uninterruptable state. A process in a runnable ...
5
votes
5answers
2k views

Nagios Check that Simulates Web Full Rendering Time

Does anyone know of a Nagios plugin or cli program that can simulate the load time of a webpage as it would be in a browser. For example the resulting total load time of something like Pingdom's Full ...
5
votes
3answers
2k views

Cacti Graphing incorrect load averages

I've just set up cacti to monitor CPU and memory usage on a server that I think needs to be upgraded, but to be able to make my case for funding I need hard facts. I figured getting Cacti to monitor ...
5
votes
2answers
341 views

Very active database with high % disk times

I have a very active website which is using a NoSql database (RavenDb). I don't have exact figures as i'm not quite sure how to extract this information (any help would be great!) But looking in ...
5
votes
3answers
163 views

Sort Active Processes in Unix

How can i sort active processes by total process time in unix?
5
votes
6answers
236 views

Is Page-Loading Time Relevant?

Take this (ServerFault) page for instance. It has about 20 elements. When the last of these has loaded, the page is deemed "loaded"--but not before. This is certainly the protocol used by our testing ...
5
votes
4answers
9k views

Find out which task is generating a lot of context switches on linux

According to vmstat, my Linux server (2xCore2 Duo 2.5 GHz) is constantly doing around 20k context switches per second. # vmstat 3 procs -----------memory---------- ---swap-- -----io---- -system-- ...
5
votes
2answers
1k views

Real-time IIS monitoring

We're looking for some monitoring software that will report and display real-time performance information for IIS. We're currently using perfmon to monitor requests executing, requests queued, ...
5
votes
2answers
3k views

Monitor and graph CPU usage per process and per thread

I need to monitor CPU usage by a given process and each of its threads. For each of them I want to have: average and maximum CPU usage percent, total CPU time used during the captured period, a ...
5
votes
2answers
5k views

How would you interpret the following vmstat output?

Consider the following five machines (named c, h, j, s and u) and their respective vmstat 1 outputs. Given the information from the vmstat output: Which machines would you consider being in a good ...
5
votes
1answer
1k views

Perfmon: which counter identifies that threads are waiting?

While load testing an ASP.NET app, we find that the pages are taking 20-30 sec under heavy load. We suspect this is because the pages are waiting for database calls or web services. Is there a ...
4
votes
8answers
6k views

Measure bandwidth usage (GB's transferred) on a linux server

I have a linux email server that I am thinking about moving into "the cloud". After investigating the pricing I see that my major cost is going to be in bandwidth. How would you guys suggest measuring ...
4
votes
6answers
1k views

How to get alert while CPU overused?

Are there any existing tools or application which can automatically send email when the CPU on server is overused? eg. CPU was more than 90% usage on a period of time or unusual CPU usage
4
votes
5answers
262 views

Justifying a memory upgrade

My employer has over a thousand servers (running SQL Server 2005 x64 and a couple of other apps) all across the country. And in my opinion they are all massively underpowered for what they need to ...
4
votes
1answer
5k views

How to save a perfmon Performance Counter as a textfile (Reliability and Performance Monitor Version 6.0)

Now the file gets saved as blg, but I would like a txt version to import in Excel.
4
votes
1answer
9k views

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 ...
4
votes
4answers
2k views

Graphing per-user CPU usage on a Linux machine

I want to graph (graphical output would be great, i.e. a .png file) the following situation: I have users A, B, and C. I limit their resources so that when all users run a CPU intensive task at the ...
4
votes
2answers
1k views

Log perfmon data to SQL Server

I am trying to log perfmon log (Windows Server 2008) to SQL Server 2005 (Windows Server 2003) using dsn (SQL Server authentication). On start perfmon counter i am getting error: "Call to ...
4
votes
3answers
192 views

Cacti - How can you get a list of systems that meet certain criteria?

Is it possible using Cacti to have it give you a list of machines that meet a certain criteria? For example, what are the machines that have had an average cpu load over 50% during the past week? ...
4
votes
2answers
143 views

Hyper-V Performance Monitoring

Background I am very new to the world of server-based virtualization (I've been running VM's on my desktops for years). The organization I work for has recently purchased a Dell server that will be ...
4
votes
4answers
816 views

how can I perform a disk performance test like hdparm -t in nagios?

The usual plugins are all about known stats of a system but we are seeing really odd results on some of our vmware instances with hdparm -t. Anyone know of a test actually does a write/read on a disk ...
4
votes
4answers
2k views

Monitoring tools that can take high rate and high volume? [closed]

We're using Cacti with RRDTool to monitor and graph about 100,000 counters spread across about 1,000 Linux-based nodes. However, our current setup generally only gives us 5-minute graphs (with some ...
4
votes
1answer
224 views

“Enterprise Monitoring Solution” with the lightest agent?

I have a network of disparate remote VPS / "cloud" / colocated servers that I would like to monitor from a central location, using open source software like ...
4
votes
2answers
909 views

Monitor load & resource usage of single process on linux (Red Hat)

Does anyone know of a way to monitor the load & resource usage of a single program. What I have is a process I'd like to know how much load it puts on the server but it's not something I can just ...
4
votes
1answer
479 views

Measuring performance on virtual machines

Here is the scenario: We have two virtual machines running on the same machine using hyper-v, one is a database server and the other is a web server. I am analysing performance information based on ...
4
votes
1answer
302 views

ZFS ARC size vs target size

I am trying to understand the inner workings of the ZFS ARC. However, I am confused with several things: actual (zfs:0:arcstats:size) vs target size (zfs:0:arcstats:c). I understand that actual size ...
4
votes
3answers
3k views

Utility for Monitoring IOPS on servers

We recently ran the Dell Performance Analysis Collection kit which monitors your servers via WMI for 24 hours. You send the file off to Dell and they return a report with graphs of IOPS and MB/S disk ...
3
votes
9answers
1k views

What are the best system monitoring/capture and reporting tools for medium sized business

The IT department has been growing over the last few years and we are to the point where we need to get some software to capture and report information from the computers, servers, managed switches ...
3
votes
6answers
815 views

How to quickly find out if a *nix server is running OK?

Often when I find myself in front of a unix/linux (or any other *nix variant) console and have to quickly diagnose the server's condition, I just can't remember everything that should be checked. ...