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

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100 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 ...
1
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0answers
248 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
140 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
155 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 ...
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2answers
93 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 ...
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1answer
56 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 ...
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2answers
1k views

Relation between disk IOPS and sar tps

I'm trying to estimate IOPS requirements of my application running on 32-bit CentOS 6.2. I started to take some measurement on a machine with SATA disks and I'm quite confused of difference between ...
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0answers
51 views

Windows servers on same gigabit lan switch, what might cause Windows 2008 R2 to have 50% longer ping times than Windows 2003 server?

After installing a brand new HP Proliant DL380e Gen8 running SBS 2011 (Windows 2008 R2 X64) I noticed a difference in response to ping requests on the wired ethernet local LAN, even before the ...
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0answers
99 views

Server wait time increases to over 5 seconds

http://i.stack.imgur.com/pxqRp.png As you can see in the above pingdom report screenshot, the wait time for this website http://quotepix.com and all other websites on the server have shot up to ...
2
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1answer
277 views

CentOS Tuned Equivalent For Debian

Running a few systems, a few are Debian which have been great. I have on the CentOS boxes tuned(tuned-adm) installed and setup for throughput. I searched all over Google and only found some articles ...
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0answers
105 views

Reason for high CPU time when executing fio

After weeks of troubleshooting some performance issues I have on my VPS running Ubuntu 12.04 LTS, I am getting closer to the conclusion that the problem is related to IO. When I have a considerable ...
0
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1answer
364 views

MySQL Performance Bottleneck - I/O or CPU?

I'm developing a web app and have run into a large performance difference between the speed of MySQL lookups on my development and live environments. DATABASE: 2.5GB, three tables (one table has ...
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0answers
168 views

Server & Mysql Config for Magento

I will appreciate if someone can help us as we think our server admin has no clue. We are having issues with our server such as mysql using too much CPU sometimes up to 70%. Especially when security ...
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0answers
114 views

best setup for fast sustained streaming (sequential?) disk writes

i am setting up a high speed/high resolution scientific image acquisition system. i need data write rates of ~1 GB/sec sustained for ~1 hour. i don't have experience with raid, but my plan is to ...
2
votes
2answers
139 views

ipfw based firewall slows down Apache web server

I have an Apache web server running on a FreeBSD 8.3 machine. That machine has an ipfw firewall with these rules: root@aigamedev:~# ipfw -a list 00005 0 0 deny ip from 67.212.xxx.xxx to any ...
1
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1answer
58 views

Traffic monitoring tools for IIS server?

We are planning to optimize IIS server.We are doing load testing of 20 concurrent user and want to see the bottleneck. How to monitor each request/response times? and check where is the bottleneck? ...
2
votes
2answers
676 views

How to delete unknown user profiles remotely?

When user is deleted from Active Directory, it shows as an unknown user. System properties -> Advanced -> User Profile -> Settings... I have to delete it manually all the time. There are more than ...
1
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2answers
368 views

Windows Server 2008: “not genuine” - performance impact?

Is it possible that not activating a copy of Windows Server 2008 might have a performance impact, specifically over TCP? Background: I've been provided with a Windows Server 2008 Oracle VM. It ...
1
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1answer
77 views

How to benchmark SSL performance IIS

We are moving from Windows 2003 IIS 6 to Windows 2012 IIS 8. When moving over to the 2012 we have seen a slow down of the website of at least 10 times and sometimes more under load. Initial testing ...
1
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1answer
105 views

Why are we having problems with multiple nics in office and production networks going to 100mbps mode?

updates and additional info 2 environments, office and production at datacenter Both environments have Cat-5e cables, a cable was replaced when it tested as bad with Broadcom's cable testing, and ...
0
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1answer
102 views

Trading Engine running on RHEL 5.x [closed]

Before asking question quick background about myself working at one of trading company this is my 1st job as sysadmin I have finish my RHCE no experience how production server work. In our company ...
0
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0answers
71 views

Postfix smarthost with diffent relayhosts and sender dependant authentication

I've setup postfix as smarthost with different relayhosts and sender dependant authentication. Everything works ok, but I have a performance question. Is it better to send all the email corresponding ...
12
votes
1answer
587 views

Why do we get a sudden spike in response times?

We have an API that is implemented using ServiceStack which is hosted in IIS. While performing load testing of the API we discovered that the response times are good but that they deteriorate rapidly ...
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4answers
64 views

Limit copy speed

Unfortunately we have a pretty bad HDD performance on one of our servers and as soon as we start bigger copy process it stops to deliver any Apache response, which is really bad. Is there a way to ...
1
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2answers
42 views

How to limit disk performance?

I am load-testing a web application and studying the impact of some config tweaks (related to disk i/o) on the overall app performance, i.e. the amount of users that can be handled simultaneously. ...
2
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3answers
364 views

How to troubleshoot performance issues of PHP, MySQL and generic I/O

I have a WordPress based website running on a shared hosting. Its response time is very decent (around 2s to retrieve the HTML page and 5s to load all the resources). I was planning to move it to a ...
1
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0answers
117 views

Why does Process Explorer cause highly targeted failure of some applications / basic UI functions in a high-power EC2 Windows instance?

Update: I have determined that Process Explorer itself - the program I am using to debug a performance issue - seems to be the cause of the issue. See note, with updated question, at end. I am ...
2
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2answers
170 views

Sendmail slow to accept emails

I have a PHP web app which is using SMTP to sendmail on localhost to send email. I would like sendmail to accept the mail request immediately and queue it for later sending, as I don't want to have ...
0
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0answers
60 views

Infopath performance issue with RODC

We have number of infopath forms deployed across the organization. Recently we started experience unusual slowness in infopath forms opening on sites with RODC. Servers Win2008R2sp1, client Win7. ...
1
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0answers
22 views

Is it worthwhile, for performance reasons, to surround Apache mod_rewrite checks with Directives like Location, DirectoryMatch, etc?

I currently have a number of Apache rewrite rules using mod_rewrite (Apache 2.2). When I turn on rewrite logging I see a number of evaluations of rewrite conditions for files that have no chance of ...
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0answers
61 views

Boot disk with VMFS read/write driver

I want to rule out the ESXi kernel being the cause for my terrible 15MB/s write speed on the local VMFS datastore. I am using a Dell PERC H710 RAID controller, and would like to boot from a boot disk ...
2
votes
1answer
155 views

VMware Performance Monitor: How does aggregation work for VM Processor\% Processor Time

I'm monitoring a Windows Server 2008 R2 SP1 VM running on vSphere 5.1 for CPU bottlenecks. I'm using Performance Monitor and configured a few counters. Two of which are Processor\% Processor Time and ...
1
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3answers
475 views

Performance difference between compiled and binary linux distributions/packages

I was searching a lot on the internet and couldn't find an exact answer. There are distros like Gentoo (or FreeBSD) which does not come with binaries but only with source code for packages (ports). ...
1
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1answer
701 views

Slow Write Speed on ESXi host

I have an ESXi 5.0 free host with an internal datastore of 7.2K 5 disk RAID 5 using a PERC 710 mini RAID controller in a Dell Poweredge R620 Server with 32GB Ram and a 12 Core Xeon. I seem to get ...
3
votes
1answer
4k views

what is acceptable datastore latency on VMware ESXi host?

Looking at our performance figures on our existing VMware ESXi 4.1 host at the Datastore/Real-time performance data Write Latency Avg 14 ms Max 41 ms Read Latency Avg 4.5 ms Max 12 ms People ...
0
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3answers
294 views

Linux server became extremely slow

I have a file sharing website, and my files hosted in a server with those system specifications: 32GB RAM 12x3TB 2x Intel Quad Core E5620 I have files in this server up to 4gb for each file. 446gb ...
0
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0answers
95 views

How to find out which process is hogging the linux server?

We have a RHEL server. Today it suddenly became slow. Symptoms - It was responding slow to ping queries from other server. When I try to login using ssh, it was taking about 10 seconds to login. I was ...
3
votes
2answers
103 views

Can more memory than I need slow down my server?

We're about to install a memory intensive application and will purchase a server for it. The server will have at least 4 CPUs, with multiple cores. While the application is memory intensive, the ...
4
votes
4answers
649 views

Disk performance below expectations

this is a follow-up to a previous question that I asked (Two servers with inconsistent disk speed). I have a PowerEdge R510 server with a PERC H700 integrated RAID controller (call this Server B) ...
0
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1answer
1k views

Upgrading a PERC h310 to a PERC H710 mini RAID controller on a Dell R620

I have an ESXi 5.0 Free license host using an internal Datastore (RAID 5, 5 Disk) that was configured with a Dell PERC h310 RAID controller. The disk performance was very poor, so I upgraded to the ...
2
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0answers
62 views

IBM xSeries 306 CPU Speed

I have an IBM xSeries 306. The system has been flawless until a week ago. It's a Pentium 4 Dual Core CPU. The CPU speed is 3.20 gHz. Now, it shows 4.26 gHz or 2.16 gHz when the POST screen comes ...
1
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0answers
25 views

Difference between all servers in one cluster and more than one cluster with servers? [closed]

Not sure I understand what´s the difference or how it works when servers a running in one cluster or if there are more than one clusters with servers in it - regard High availability & Load ...
2
votes
2answers
565 views

Large keepalive_requests values are severely slowing-down Nginx

When running a bacon (43-byte transparent pixel) load test on Nginx, we have tried several keepalive_requests values (from 10 to 100,000) and the optimal value seems to be 10. Here are the server ...
1
vote
1answer
277 views

How to erase a SSD to restore factory performance in Linux?

Due to big performance issues with an mdraid-1 array I'd like to pull down from the array one of the devices (Samsung 840 Pro), erase it to restore factory performance and re-add it to the array. The ...
0
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0answers
216 views

Configuring ubuntu web server for wordpress stress test with apache jmeter

sorry for my english and the wall of text in advance. I've been given a project where I have to setup and configure a server with wordpress in a local environment, for stress/load testing purposes. ...
1
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0answers
93 views

big speed difference on a network link with and without VPN tunnel

Scenario: We have a network link between two offices. The link is provided by a third party company through a VLAN on their network, but to us it is totally transparent -as if we had a simple ...
0
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2answers
56 views

Recommended Setup

I have been running into issue with my MSSQL Database setup with speed. Here is my scenario. About 100M Rows Average: 1k Updates Per Second Hard Drives: RAID 10 SSD MDF --Active Time: 0 Log ...
1
vote
1answer
164 views

KVM Slow performance on XP Guest

The system is very slow to do anything, even browse a local folder, and CPU sits at 100% frequently. Guest is XP 32 bit. Host is Scientific Linux 6.2, Libvirt 0.10, Guest XP OS shows ACPI ...
1
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1answer
363 views

Various problems with software raid1 array built with Samsung 840 Pro SSDs

I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB). Problems: ...
3
votes
3answers
233 views

MySQL hangs if connection comes from outside the LAN

I have a MySQL Server operating just fine if I access him from his local LAN (192.168.100.0/24). If I try to access hin from another LAN (192.168.113.0/24 in this case) it hangs for a really long time ...