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

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1answer
209 views

Intermittent performance issues on Azure Web Application with ASYNC_NETWORK_IO errors

Our web application is suddenly experiencing intermittently slow performance (slow page loads, slow ajax calls going from <1 sec to over 20 secs). The only clue is when the application slows, we ...
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0answers
34 views

Dual Drive Failure and server restore slowness on Windows Server R2

I recently had a hosting company that had a dual drive failure within 6 minutes of each other, not sure how that could even happen. However they had to restore a backup of the server last night. ...
0
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1answer
135 views

Linux unfriendly IIS/ASP.NET :-) : Quick download on windows but slow on linux [closed]

This particular web site (gops.tay.be) serves objects quick if I try to request the page using windows, but I get them very slow if trying using linux. There is no difference if I use browser or curl: ...
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1answer
56 views

Does not measuring performance improve performance?

Running the Task Manager or Resource Monitor or even simply viewing the status of a network connection indicates the system is constantly tabulating a large number of performance metrics. It must ...
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2answers
44 views

Distribute all services between 3 VPS [closed]

i just rent 3 vps servers with this: 4GB RAM 150GB hard disk 2 CPU 6 ip address so we have vps1, vps2 and vps3 and i'm thinking distribute the services like this: VPS1 - frontend + DNS Server + ...
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4answers
901 views

Heavy production MySQL/Percona Database in openvz container

So I'm currently running a MySQL 5.1 database, with the following specs: Proc: Intel(R) Xeon(R) CPU E5-1620 0 @ 3.60GHz RAM: 64 Go disks: 2x 100 Go SSD (RaidSoft) I'm planning to migrate my ...
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3answers
702 views

How can be ping used to measure a server speed? [closed]

When I ping myserver.com, I get this responses: 64 bytes from XXX.XXX.XXX.XXX: icmp_seq=1 ttl=242 time=52.6 ms 64 bytes from XXX.XXX.XXX.XXX: icmp_seq=2 ttl=242 time=55.9 ms 64 bytes from ...
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1answer
230 views

Randomly slow MySQL queries

I know this type of question come often. But I have done a lot of research, tried a lot of different settings, but still have the same issue: queries that usually are very fast can take 3s to 5s ...
3
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1answer
1k views

Very poor disk performance on KVM node - mdadm raid10

For a long period of time, i'm experiencing performance issues on CentOS servers that are used for KVM virtualization. I'm running software RAID-10 with 4 disks (Seagate ST2000DM001, 2TB, 7200rpm ...
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2answers
202 views

Graceful way to rsync millions of files between two local folders

I want to rsync a folder with millions of files from a local directory to another, on a daily basis. The files themselves change very rarely. I want to reduce the impact on the running server, e.g. ...
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2answers
42 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. ...
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0answers
115 views

How to debug sluggish process performance

I have a test application which writes a string to a file 10000 times. I run this on two servers and I get totally different results. [SYSTEM 1] $ time ./test_depth real 0m0.152s user ...
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2answers
2k views

Is it possible to use SSD for storage on Windows Azure?

There is some marketing-speak suggesting that it may be possible ..: http://gigaom.com/2012/06/05/new-windows-azure-goes-all-ssd-to-one-up-amazon-in-the-cloud/ .. but I couldn't find any way to ...
1
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1answer
369 views

Why WHM, New Relic and SSH memory usage statistics different?

I have a Cent OS 6.4 Apache Nginx VPS. I have WHM cpanel. How do I check past 24 hours or 48 hours this server RAM usage? I use new relic server monitor web application. It reported that, this VPS ...
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0answers
47 views

How do I reduce server load for a dormant WordPress site using W3 Total Cache?

My current host who did all performance optimization for me has jacked up their price to $1,000/month, so I was forced to move to a new host. The new host charges only $150/month. They give you W3 ...
0
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1answer
85 views

How to benchmark a whole storage infrastructure

I'm a 100% sure that I'm not the first one to consider benchmarking a whole infrastructure, but yet I haven't found any relevant information on how to face this challenge. As I guess we all know what ...
1
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1answer
3k views

HTTPS overhead compared to HTTP

HTTPS is the encrypted version of HTTP, and nowadays it is becoming a common practice to encrypt all the web traffic, not only sensitive one. The drawback of HTTPS, apart from the need to buy ...
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1answer
42 views

Wireless performance, normal results

Here is the setup: An IBM server machine connected to a TP-Link TL-WR1043ND (latest firmware). It is connected with a wired gigabit connection. An lenovo laptop with a centrino wireless-n 2230 and a ...
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2answers
42 views

What exactly is controlling single HTTP requests speed? [closed]

As you may know using multiple HTTP threads when downloading a file from a server can significantly increase your download speeds if not max it out. What is control of determine the throughput of ...
2
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1answer
220 views

My Ubuntu VPS is not using available swap, even if OOM. What to do?

I recently added 1 GB of swap to my Ubuntu virtual private server to prevent MySQL crashes on RAM overloading. I followed this tutorial. I use htop to monitor resources. When I use loadimpact to test ...
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4answers
4k views

LSI RAID: Write cache policy affects read performance?

I have a server with a LSI MegaRAID SAS 9260-4i controller, RAID-5 with 3 x 2 TB disks. I did some performance testing (with iozone3) and the numbers show clearly that the write cache policy affects ...
1
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1answer
82 views

Advice on web server performance troubleshooting is needed

I'm renting a virtual CentOS based server where I have about 5 active sites running. Several months ago I noticed a significant performance degradation in how my sites are running. First symptom was ...
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2answers
219 views

How to tell which script is slowing down the server the most?

As it happens often to coders, I had to take over someone else's code for this company, the server runs on Amazon Cloud (i2.xlarge) running ubuntu-saucy-13.10-amd64-server. (the guy left) The ...
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2answers
639 views

Why does dd show slow disk speed first time?

I'm checking the disk speed of a hdd on CentOS 6 using dd command. The setup is a DRBD setup - with this server being primary. To ensure that I get correct values, I execute the dd command 3 times ...
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2answers
2k views

Poor SQL performance on HP ProLiant ML310e Gen8 v2 with raid10

I recently bought HP ProLiant ML310e Gen8 v2 server with 8G's RAM and 4 HP 1TB 6G 7.2k rpm SATA (3.5in) Non-Hot Plug MDL HDD disks. It was surprise to me that HP didn't provide debian drivers for ...
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2answers
1k views

Importance of disk alignment for Windows Server 2012

I saw article about Disk alignment here and also here.Also there where some references that windows server 2003 has some problem with disk alignment. After reading article I am confused whether we ...
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0answers
518 views

Why are pgpgin/s and majflt/s inconsistent in sar -B?

In sar -B ouptut, I would naively expect pgpgin/s to equal majflt/s multiplied by the system page size. From man sar: pgpgin/s Total number of kilobytes the system paged in ...
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1answer
60 views

Firewall Connections fail to open under load

Problem : During High load , our applications are encountering errors : java.net.connection Time out. After some investigation , we found out that it was Firewall the root cause, but still don't know ...
0
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1answer
36 views

Slow application performance in one location

We have a problem that perplexing both of us in our department. We have a video viewing application that we need to have loaded on a workstation to be used in a particular location. When we load a ...
0
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1answer
167 views

Using all host resources for a single Windows VM (KVM) - how to improve performance

We're using KVM/qemu on Ubuntu 12.04 to spawn a Windows 2008 R2 VM that uses a lot of host resources (all CPU cores, 4GB RAM). It seems that during a Windows boot that Windows allocates all its ...
2
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1answer
207 views

How Long Should Data Collection Sets run in Windows Server Performance Montioring

I currently have an application server and a database server both running on Windows Server 2008 R2. I have been tasked with generating a weekly report on the utilization of CPU, Memory and Disk. I am ...
0
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1answer
51 views

uk vps server route to thailand? [closed]

I'm just a Javascript developer using node.js... My host has got me a vps sever in england. I have had someone test my site loading in england and it is lightning fast. I've also had someone test in ...
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1answer
683 views

High CPU load caused by slow disks?

We are running a online application on a 3-year old server (quadcore Xeon, 4GB RAM, SAN-disks). The server hosts besides the web application a SQL-, FTP-, SFTP, SMTP, and POP-services. Over the years ...
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1answer
309 views

Performance impact of slower encryption/hash/group settings in Phase 1

When defining IPSec VPN tunnels, how much of a performance impact can I expect from choosing "stronger" Phase 1 settings (such as AES256/SHA1/DH5 over DES/MD5/DH1)? For example, I'm told that AES-256 ...
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1answer
40 views

Loss of performance on backup power

I tested my system on backup and saw considerable degradation in performance when running on backup. Here are the results: Config: CPU: 2.0 Ghz, 6 Core, 12 Threads RAM: 16 GB UPS: 600W/ 1000VA PSU: ...
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3answers
1k views

Does software RAID-0 really improve performance?

I am going to lease a server and I have two options, SATA or SSD, I decided to save the money and go for the SATA option. But I do not need all that storage they are giving me! So I thought MAYBE I ...
2
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1answer
183 views

mdadm raid10 or nfs performance issues?

I have a fresh mdadm RAID10 device which is healthy, built from 4 x 7200rpm SATA 3 drives: # cat /proc/mdstat Personalities : [raid10] [raid1] md2 : active raid10 sdc3[5] sda3[4] sdb3[1] sdd3[3] ...
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0answers
129 views

Infiniband link is at 4X SDR with DDR HCAs; has anyone seen this before?

I've recently upgraded my Infiniband HCAs from SDR to DDR, however upon upgrading, it has not improved the link speed at all. Receiving the following output from 'iblinkinfo': CA: ip-san-1-au3a ...
0
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1answer
94 views

Website is slow without https

As you can see, http://coinad.com/ is slow, and https://coinad.com/ is fast. I've upgraded the server, reviewed the code, optimized the tables and anything seems to work. This is driving me mentally ...
4
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1answer
393 views

iSCSI TGTD over InfiniBand Performance

I have just configured a server-to-server 4x SDR InfiniBand link to increase bandwidth for the backend storage of my virtual machines, specifically a database server. I am using iSCSI with TGTD on ...
1
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1answer
133 views

Choosing the right database/storage engine for iptables ulogd

I'm looking for some help choosing a database backend for a iptables ulogd setup. We are going to swap out our current proprietary firewall solution with iptables and one of the requirements is to ...
8
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3answers
360 views

Adding CPUs puts MySQL 5.5 (Debian) performance down

I am about to setup a database server (MySQL) in OpenVZ container and I've been wondering how many CPUs I should assign to it. I decided to benchmark it. I compared two OS/MySQL distributions and ...
1
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1answer
716 views

3ware card in RAID-5 configuration slow and causes load when writing

I have a 1Gb/s bandwidth between my computers. The source can actually read and send data at 25MB/s via SSH. My test file is 4GB, I use scp without compression for the test transfer. The rate is ...
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0answers
232 views

Apache AB results: why does adding concurrency not increase requests processed per second?

So I've been trying to use apache ab to benchmark performance, but I'm having trouble understanding why I'm getting these results. FYI, its a PHP app using Zend Framework, mySQL database, and mostly ...
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0answers
203 views

Subversion performance issue on Linux

My developers is complaining our SVN is slow. This is the data they collected:http://i.stack.imgur.com/SmYUS.jpg. The SVN server is on Linux in Canada and developers using Cygwin on Windows in UK. So ...
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0answers
604 views

windows2012 failover cluster + storage. Considerations

We plan to build a failover storage with Windows2012r2. There will be 2 or 3 physical machines with 2 virtual machines on each server. One virtual machine building a failover, second one being storage ...
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2answers
416 views

FS for many small files, mostly reads?

I need a direction since all the blogs/benchs seems to contradict. Goal: Having a lot of small files on FS in a directory tree fashion similar to this AB/CD/EF... Two size groups : G1 : 10-20 kB G2 ...
3
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1answer
238 views

IO related performance bottleneck on a LAMP server

I am administering a big LAMP server with some thousand users. About a week ago, things slowed down, and the only thing I see that the IO latency is increased dramatically. Users experience slow page ...
1
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2answers
159 views

Different name servers for different countries. Speed up DNS lookup time [duplicate]

Is it possible to create different NS for different countries? For example, we have 4 nameservers: #for US ns1.us.domain.com ns2.us.domain.com #for Europe ns1.europa.domain.com ...
0
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1answer
89 views

Order that Apache handles .htaccess directives

I was working on a WordPress site yesterday, mostly in a Web Performance Optimization capacity (on shared hosting). At one point I noticed that my .htaccess file had redundant, possibly ...