Questions about server hardware and software performance, or network performance.

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0
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1answer
88 views

UFS wedge : “Out of journal space!” - how to tune? (FreeBSD)

I'm running FreeBSD 9.2p13 with UFS and journaled softupdates. Does anybody know how to tune softupdates journal on UFS? There are no suitable information in handbook, man pages or sysctl ...
1
vote
1answer
737 views

Oracle: TRUNCATE sometimes takes ages

Usually, truncating a table takes 5-10 seconds. But when several people work on the same DB instance (but different tables), the operation can take more than an hour. How do I debug this?
2
votes
3answers
822 views

Is it ok to team NIC's from different vendors together in VMware ESX?

I want to achieve the best performance with my two servers (SAN and ESX). I have good RAID (LSI, SASes), that is showing 1GB/s result, so the bottleneck now is network part since I have only two NICs ...
0
votes
2answers
308 views

MySQL Database Problems - Growing too quick, Performance

I have some problems with my database setup: The MySQL Database is written to every few seconds and it grows in size very quickly. My disk space is limited though, so I have to work around that. ...
0
votes
1answer
178 views

epoll timeout configuration in lighttpd

Is there a configuration option to tune epoll timeout in lighttpd? I'm developing an embedded Linux (2.6) device, with lighttpd 1.4.30. And I'm observing the following issue: even when the system is ...
11
votes
8answers
13k views

Troubleshooting a “slow” network

We've all had a complaint that the "network" is "slow" at some point: might be localized to one room (switch) or one computer, might just be Internet (DNS? Browser issue?), might be just one ...
1
vote
4answers
8k views

How long does it take to rebuild a drive in a RAID 6?

I'm building a 7-disk RAID 6 array on a DELL MD3000 DAS box. My top priority is storage space, so I'd like to use 2TB drives -- but I'm worried about how long it will take to rebuild a failed disk. ...
0
votes
0answers
92 views

Python libraries slow to load from NFS mount point

Several of our computers are diskless, and they load their Python libraries from an NFS mount point across the network. This means it can take up to three minutes to start up a Python process that ...
0
votes
1answer
51 views

Does PostgreSQL perform on Windows as well as on Linux

This topic was brought up in 2011, and the consensus was that there were design considerations that would give PostgreSQL a leg up on Linux. It is now 2015, has that changed? If there are things that ...
3
votes
2answers
2k views

Find current IOPS usage of EBS volume from my application on AWS EC2

I am relatively new to AWS and disk performance. I am trying to figure out how much provisioned IOPS does my application need to perform well. Currently My PHP and MySQL application is hosted on EC2 ...
0
votes
0answers
28 views

Troubleshooting high load average

We have a cluster of Centos 6.5 servers that run Java on them. These servers connect to a cluster of MongoDBs quite frequently. On the Java cluster, we are seeing high load averages but CPU ...
7
votes
4answers
7k 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 ...
0
votes
0answers
61 views

Is it better to store the MySQL database directory on a separate RAID 1 device?

We have a Linux server with a RAID 1 using two HDDs on which runs a Apache server managing multiple sites and some other services that interact intensively with the databases and produce massive ...
0
votes
1answer
282 views

Postfix mail server (outbound) strategy

I am about to setup a web application that consists of 2 app servers (running php/apache) and 2 db servers (ubuntu slices on slicehost). The application will be sending approximately 5000 emails a ...
0
votes
2answers
144 views

email sending speed - how to improve

I am maintaining a server to send email mailings (no spam, of course). The current speed of this machine is approx. 2000 emails per hour. (edit: actually I did a test mailing today, removing the ...
0
votes
0answers
19 views

Poor memory performance on intel avoton?

I have 12 of these supermicro A1SA2-2750F boards that I'm playing around with in order to compare them to Dell's C5220s but I'm seeing consistent poor memory performance. Just curious if anyone's ...
2
votes
2answers
2k views

How to improve Varnish performance?

We're experiencing a strange problem with our current Varnish configuration. 4x Web Servers (IIS 6.5 on Windows 2003 Server, each installed on a Intel(R) Xeon(R) CPU E5450 @ 3.00GHz Quad Core, 4GB ...
1
vote
1answer
95 views

Linux fixed file size copy from Windows Server 2012 NFS share

Company is in the process of switching from hosting MongoDB on windows server 2012 to hosting on linux(ubuntu 14.04) Current backup and restore strategy involves copying all the data files via ...
3
votes
1answer
1k views

Very low throughput on 10GbE network

I have two Linux machines, each equipped with a Solarflare SFN5122F 10GbE NIC. The two NICs are connected together with an SFP+ Direct Attach cable. I am using netperf to measure TCP throughput ...
0
votes
0answers
51 views

Apache and JBoss mod_cluster speed up reload

As an alternative to this question, is it possible to decrease the amount of time that it takes for the Apache (httpd) server to pick up the JBoss servers after the Apache server reloads? As of right ...
6
votes
1answer
64 views

postfix performance with lists in main.cf

For defining a list of items to assign to many different options in postfix, you can either use a comma separated list like this: relay_domains = example.com,example.net,example.org or a hash map ...
0
votes
1answer
33 views

Http proxy server performance analyzing

I have implemented a http proxy client/server. Currently I intended to test performance of this proxy client/server. Can anybody tell me what kind of tests should I take to analyze it's performance? ...
0
votes
2answers
40 views

Apache Configuration not use server capabilities [closed]

I have a web server with 16 GB of RAM. The server has a good traffic and have pics of 300 simultaneous requests. Unfortunately when these peaks arrive queries fall into error or are very very slow. ...
1
vote
1answer
80 views

What can explain Hyperthreading bringing a server to its knees

In the last year I've had 2 brand new servers that I commissioned where their performance made them unusable. The both servers were Dell R620 servers with 1 processor. One had 6 cores and the other ...
1
vote
2answers
459 views

MSMQ write taking > 1 minute

We have an ongoing problem with message writes to MSMQ being very slow. Our queue is on Windows Server 2008 SP2. The queue is a public queue, addressed at "servername\queuename". The code to send a ...
0
votes
0answers
26 views

Loggin request execution time along with requested URL

I'm running a ASP.NET WEBFORMS application on a windows 2012 Server. I need to be able to calculate average execution times for each page in my application. I know the IIS logs have a time-taken ...
0
votes
0answers
40 views

How efficient is the tac command on large files

The taccommand (catreversed) can be used to read a file backwards, just like cat reads it rom the beginning. I wonder, how efficient this is. Does it have to read the whole file from the beginning and ...
1
vote
0answers
202 views

Appropriate fan speed for a Dell PowerEdge T710

We have a DELL PowerEdge T710 in our office and it is really really noisy, the fans sound like vacuum cleaners! The discussion is whether the server is malconfigured and can be made more silent or if ...
4
votes
6answers
792 views

Effect of distance from server on page load speed

I measured the load speed of a static image file severed by nginx from my server (using pingdom service). The server should normally process this request within few seconds. My server is located in ...
99
votes
4answers
134k views

FreeBSD performance tuning: Sysctl parameter, loader.conf, kernel

I wanted to share knowledge of tuning FreeBSD via sysctl.conf / loader.conf / KENCONF / etc. It was initially based on Igor Sysoev's (author of nginx) presentation about FreeBSD tuning up to ...
1
vote
2answers
138 views

Slow serving of static files with IIS 8

We're hosting an ASP.Net MVC web app on Windows Server 2012, which runs over HTTPS. Most of the time everything is nice and fast, but we've noticed that about 1 in 50 requests for static files (e.g. ...
0
votes
0answers
42 views

Determine is VPS is slow just through PING?

I'm running a severe issues on this site and I'm trying to see if the problem is at server side (just if VPS is slow or some kind of miss configuration) or software side (Wordpress). I'm not an expert ...
0
votes
0answers
22 views

How to measure file access by process over time?

I would like to take a sampling of data / file access over the course of several hours or days in order to ascertain what processes (with their accompanying files) are consuming the most drive IO in ...
0
votes
0answers
15 views

How to ascertain where to effectively allocate server resources?

I have recently received an upgrade to one of my servers of a 256GB SSD drive (this is in addition to two other primary 1TB drives) and a memory upgrade bringing the server to 64GB from 32GB of RAM. ...
5
votes
2answers
2k views

Unable to increase the dynamic port range on Windows Server 2008

I'm trying to "tune" the TCP/IP stack on some Windows Server 2008 machines by following the instructions here: ...
0
votes
0answers
29 views

Taking a thread dump on IBM J9 takes a long time

I'm trying to collect a java core on AIX (java version 1.6). There is only one dump agent configured, which collects a system dump, heap dump and java core on every SIGQUIT, so I used HealthCenter to ...
15
votes
3answers
8k views

How much overhead does x86/x64 virtualization have?

How much overhead does x86/x64 virtualization (I'll probably be using VirtualBox, possbly VMWare, definitely not paravirtualization) have for each of the following operations a Win64 host and Linux64 ...
-1
votes
1answer
45 views

Compiling nginx and php

Im about to set up a basic web server based on ubuntu server 14.04 x64 with an online shop section, the server will also consist mysql, mail, and maybe other servers as well until it runs smoothly. ...
1
vote
4answers
859 views

Tunning Apache and server for massive photo uploads

I got an Apache webserver running in a EC2 platform. It's receiving a lot of uploads from users (big pictures files). The problem is that immediately after upload I have to convert images to other ...
0
votes
1answer
49 views

6 GB/s SAS RAID 10 (6 Drive) vs. 3 GB/s SAS RAID 10 (14 Drive)

I am running MS SQL 2014 Standard and have a Dell MD 3000i iSCSI SAN. Rough specs: Dell R610 With PERC H700 controlling 6 x 2.5" 15K SAS drives (6 GB/s) Dell MD3000i with 14 x 3.5" 15K SAS drives ...
0
votes
0answers
36 views

ATM connection has slow upload speed when connected to switch or router

We just got a new additional ATM line with 10/10 Mbps. When connected directly to a PC NIC, internet speed tests all come up as 10/10 Mbps. However, when connected to any of several routers or ...
0
votes
1answer
40 views

Test cloud VM performance

I have a linux VM hosted in a cloud environment. I suspect the provider to do too much overprovisioning with CPU and IO, from time to time. For example postgresql's reports 300ms+ queries that are ...
3
votes
1answer
316 views

CORAID using only 1 of the 2 available NICs for AoE traffic

We got 6 CORAID shelves in my workplace. On 2 of them I see AoE traffic on only 1 of the 2 NICs that are attached to the SAN switch. We got jumbo frames enabled on all devices. Both NICs show up when ...
1
vote
2answers
1k views

anyone using coraid storage: ATA over ethernet?

can these enclosures be populated with SATA or SAS drives purchased elsewhere? recently Dell has made custom size slots on their PE T710 servers on which you could only place drives purchased from ...
0
votes
0answers
51 views

How to interpret atop Disk usage and what disk usage is reasonable

I have a a couple of virtual machines all with the same provider. I'm using them for web hosting and have started to get intermittent slow page load times. I've installed atop to try and get to the ...
8
votes
3answers
15k views

Xen vs. VirtualBox under heavy load?

Which performs better under heavy CPU and memory usage on the virtual servers, Xen or VirtualBox?
0
votes
4answers
2k views

What is the difference between QuadCore and Core2Quad?

In Market there are two types of processors as Core2Quad and QuadCore. What is the architectural/performance difference between two flavours? I have the same question with older Core2Duo and Dualcore ...
3
votes
5answers
274 views

Router limits network performance but its CPU load isn't 100%

I'm using a PC Engines APU device running FreeBSD as a NAT router. The setup is very usual: one WAN connection and one LAN connection. Theoretically, WAN connection is 800/40 Mbit/s and the LAN one ...
51
votes
10answers
14k 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. ...
0
votes
1answer
22 views

Are there benchmarks that measure code execution with various CPUs? Nodejs server building

I have experience building PCs with gaming in mind. But where do I start when it comes to building a server (running specifically NodeJS programs)? I know the most significant factor would be the ...