Questions about server hardware and software performance, or network performance.
1
vote
0answers
83 views
Is it time to add a server [duplicate]
This question is about figuring out if horizontal scaling by adding servers is the next step or not. Here is the context:
About 1400 concurrent users at peak time (between 11:00am-4:00pm) in Google ...
3
votes
4answers
192 views
rm intermittently causes disk to lock up
I have encountered this extremely strange problem on two servers now, both running CentOS5, both of them ext4. One is a SSD, the other is a regular hard drive, both SATA without RAID.
The issue is ...
1
vote
2answers
830 views
VMware ESXi 5 Slow performance, hundreds of I/O latency errors. [closed]
We have a standalone ESXi5 Server with the follow hardware specs:
- Supermicro X8DTL
- Intel Xeon(R) CPU E5506 2.13GHz
- 25G Ram
- 1TB HD (mirrored RAID, local SATA)
We have around 17 VM's running, ...
0
votes
1answer
165 views
Core i7 vs Xeon — Floating point performance
I am building a development server for a calculation-intensive application. We're using CUDA and maxing out our current CPU. Floating-point calculation speed is of most importance.
I have been ...
0
votes
1answer
395 views
GlusterFs - high load 90-107% CPU
I try and try and try to performance and fix problem with gluster, i try all. I served on gluster webpages, php files, images etc. I have problem after update from 3.3.0 to 3.3.1. I try 3.4 when i ...
1
vote
0answers
96 views
Postfix, Attachments and Virus scanning, difference between Milters AND Filters? Efficiency and Performance
I'm re-implementing an overloaded Postfix cluster, which beyond its many problems, has major efficiency concerns. The cluster is a dedicated MX Gateway, so mailboxes are not a consideration. ...
2
votes
1answer
452 views
Whats the cause of VMWare esxi Ubuntu very slow disk performance (3MB/s)?
Currently I am running Zentyal Server(Ubuntu) as Guest on a esxi 5 host on a Adaptec raid controller RAID 10 with Enterprise WD hard drives, 8 Core CPU and 8 Gb of ram (I know a bit overkill) to ...
0
votes
1answer
32 views
Should getfacl be running constantly and is it normal for it to be using greater than 90% of available disk I/O?
I've recently been getting alerts from our server monitoring software about greater than 90% disk I/O utilisation.
I installed iotop and there are three instances of the following process showing up ...
-1
votes
1answer
61 views
Server Stack for small startup [closed]
I'm trying to expand my knowledge from just being a LAMP developer to system/network admin. The main reason why I want to do this is because I've been tasked with setting up the infrastructure for a ...
-1
votes
2answers
160 views
How Can I Maximize Apache Performance on my Server - Need Calculations Please [closed]
I have a Sun T5140 server with 8GB of memory and two 4-core T-Series CPU's (128 max threads). This server is a dedicated web server. Based on the premise that I'm willing to allocate 1/2 of the ...
-1
votes
1answer
72 views
How to actually check mysql variable for performance? [closed]
I have installed XAMPP on my Mac. I know that XAMPP is tuned for very slow desktop and as I have almost 3 million records which I need to join. I have to change something. My tables are MyISAM. As ...
1
vote
2answers
63 views
Will including the CSS & JS in the HTML improve page load times and / or server performance?
Which of the two HTML snippets perform better?
Including the CSS & JS in the HTML
<html>
<head>
<style>
<?php include("someStyle.css"); ?>
</style>
...
0
votes
4answers
66 views
Need advice about network distance & speed
My company has two office locations about 200 meters from switch to switch, and at the moment the network speed between our two networks is really slow. The network is a 100Mb network with 2 ...
0
votes
0answers
18 views
FFMPEG - Hardware Optimization [duplicate]
Please do not confuse this question with - Server to use for ffmpeg
What I am trying to figure out is, for a Youtube like service, how hardware is optimised/utilised?
I think, we need to consider ...
0
votes
2answers
142 views
Broadcast traffic on large vlan in numbers [closed]
I'm looking for the magic number of how many clients make sense to have on a single VLAN, before the broadcast traffic becomes a real issue.
Preferably, I'd also like to know what a good number of ...
1
vote
1answer
98 views
How to change the scheduler of a RAID 5 device?
I've created a RAID 5 device block by combining 4 HDDs.
The name of my device is md1.
But the /sys/block/md1/queue/scheduler file outputs "none" on doing cat.
And also after editing it using vim ...
0
votes
3answers
84 views
Several Cron at same minute
I'm installing a bunch of Magento shops on a webserver. Every website has a cron job that Magento uses to update its stuff -- it takes 3-4 seconds to complete. The instructions tell to set it to run ...
1
vote
1answer
95 views
What could this extra 50ms latency be on my unbound DNS resolving server (Fedora)?
I have a discrepancy in query latency. It's not a problem, it's just strange enough to worry me.
Client machine (Fedora 18) runs unbound-1.4.19-1.fc18.x86_64.
Server machine (Debian 7 testing) runs ...
2
votes
2answers
82 views
Disk Monitoring with cronjobs — report disk issues
Is there a way to monitor disk health and send cronjob reports for errors?
I know you can use smartctl -s on -a /dev/hda to pull information but just wondering if there is a way that could be used to ...
-2
votes
1answer
47 views
drupal on development machine slow [closed]
My drupal site on the development machine loads the pages slow. A page takes between 1500ms and 2500ms. The same site in production on the internet loads pages quick.
Using development tools in ...
0
votes
0answers
47 views
Apache Settings for a site with multiple concurrent file download [closed]
I have site that allows users to download media file (mp3 mp4). The files range from 10mb to 90mb in size. There are anywhere from 150-300 users signed in and downloading files at one time. Right now ...
0
votes
1answer
74 views
Why is autovacuum using so much IO when running on a partition's master table after upgrading PosgreSQL from 8.4 to 9.1?
We have an application where we are collecting timestamp-based data. Since a month of data goes over 30M rows (and growing each month), we decided to partition the data on an year-and-month basis.
We ...
0
votes
1answer
259 views
High load and iowait on MySQL database server leads to slow MySQL INSERTS
I have a MySQL database server runnuing on Ubuntu 12.10 with 64GB RAM, 2x3 TB SATA 6 Gb/s HDD 7200 rpm and software RAID 1 and an Intel Core i7-3930K.
The database server is accessed over a local ...
2
votes
2answers
137 views
Is there a Unix / Linux command to count lines per second from stdin?
I am trying to count the number of SQL queries per second from a log file and I want to do it in real time by pipeing stdout from grep into some command. ( I am doing some performance testing )
I ...
2
votes
1answer
118 views
Raid-10 - how many disks should i span for read performance?
We manage a mid-sized array of images (4kb -> 1mb or so) using DAS hardware that is NFS exported to various webservers. We have traditionally used raid5 for the safety-net and storage-gains, rather ...
0
votes
2answers
93 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
0answers
25 views
a DNS server with configurable delay (for testing purpouses)
I would like to test an impact of a slow responding DNS (caching) server on various applications by configuring a arbitrary delay (between 0 and say 3 sec) on my test DNS server. I've found a way to ...
0
votes
1answer
95 views
MongoDB Master and Slave - Windows or Linux [closed]
I have recently moved my MS Sql Server DB to MongoDB (2.0) on Windows Server 2008. Its containing 2 databases with following stats. (both databases get around 100 reads/writes per second). These ...
1
vote
1answer
335 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
1answer
234 views
Weblogic intensive CPU usage
I am using Weblogic 10.3.4 + Oracle DB both on Solaris machines (VM)
Unfortunately last week our app hosted on Weblogic became very very slow not being able to serve new users coming (everything ...
1
vote
1answer
34 views
What are some easy tips for accelerating SSL when using IIS?
This evening while perusing Hacker News I came upon a post with the title 5 easy tips to accelerate SSL. An interesting read, but I don't use Apache or Nginx and am instead interested in similar tips ...
2
votes
4answers
459 views
Flush-0:n processes causing massive bottleneck
I have a LAMP cluster that shares files via NFS and occasionally one of them will be stricken for a while when mysterious flush processes start appearing.
Can anyone help me? The only way to resolve ...
1
vote
2answers
138 views
For Apache, what Linux command do I type to watch performance in real time?
What command can I type with Linux where I can watch Apache HTTP web server load in real time?
BACKGROUND: I can type 'top'. That let's me watch overall server load (just look at inverse of Idle % ...
6
votes
2answers
109 views
What Linux command do I type to see my MySQL server load in real time?
What Linux command can I type where I can watch MySQL server load in real time?
BACKGROUND:
I can type 'top' and watch overall server load (just look at inverse of Idle % and consider it over a ...
3
votes
2answers
128 views
Linux - Storage IOPS
I have number of MySQL databases, I have used tools such as dstat, vmstat I'm just unable to determine when do I need to add more drives to increase performance.
the number of databases are ...
1
vote
1answer
224 views
MongoDB replicaSet failover incurs 1000x query response time increase
I'm testing a production MongoDB replica set failover. When I manually fail one of the instances I see an approx. 1000x (one thousand x) decrease in response times of my PHP queries.
I'm on the ...
1
vote
1answer
251 views
Apache tuning recommendations for Windows Server 2008
We have implemented Apache 2.4 64bit on Windows Server 2008 R2 as a reverse proxy to take advantage of a wildcard cert for our domain. We have been disappointed in the performance with even a light ...
2
votes
1answer
157 views
Why my 15K SAS HDD drives are so slow? [closed]
I have a DELL PE2950 III 2x 3.0GHz Quad Core 32GB RAM.
The card is a Perc 6i SAS dual channel Raid controller w/256mb of cache and BB.
The hard disks are
5 x 146GB 15k 3G SAS dell drives ...
0
votes
3answers
63 views
Intermittent Server Error - MySQL or Apache?
I've been having a pretty annoying problem with a website I work on, and I'm having difficulty saying whether the problem lies with PHP, Apache or MySQL.
System setup: cloud hosted solution (moved ...
0
votes
0answers
88 views
MySQL Extremely High Disk Activity (Read Operations)
I have 1GB Linode VPS with a standard LAMP stack. Apache is tuned fine but for some reason MySQL's disk usage is high. This is causing really slow site load times. RAM and CPU usage are fine.
Can ...
2
votes
1answer
356 views
Linux file system cache: Move data from Dirty to Writeback
My software RAID can write 800 MB/s sustained. I see that happening when cat /proc/meminfo |grep Writeback: returns > 2 GB. However, most of the time the writeback is round 0.5 GB which gives a ...
1
vote
2answers
72 views
Easy Apache module to throttle requests based on machine load?
I have an Apache server that is serving a django application with mod_wsgi. I'm wondering if there is a simple way to throttle requests at the apache level based on the machine's load.
Ideally I want ...
0
votes
1answer
96 views
*tiny* SOHO fileserver upgrade recommendations in 2012? [closed]
I say 2012 as we'll likely be buying last year's hardware. We're non-profit (a two-man operation), and this purchase isn't on project funding, so we're cost-restricted, but I always advocate for ...
0
votes
2answers
168 views
Need advice on mysql/apache performance tuning. Are my parameters right? [closed]
I have DS with 3GB RAM and my processor is AMD Athlon(tm) 64 X2 Dual Core Processor 4200+.
My server is running:
Fedora release 15 (Lovelock)
Linux *** 2.6.40.6-0.fc15.x86_64 #1 SMP Tue Oct 4 ...
1
vote
1answer
101 views
Tune web server based on stats by munin
At our company, we have set up a munin node to gather data about our web server every five minutes. These datas are presented in a graph, and we're wondering if there is anything to gain from tuning ...
1
vote
2answers
120 views
How does CPU consumption look like from a VM on a heavily use VM Host?
I know I could test this, but I don't have the time right now to setup pristine test conditions to learn something that should be in documented form - and that I cannot find in an authoritative form.
...
1
vote
1answer
73 views
RAID: is it enough to have n+1 disks in a RAID6 array to match performance of a n disks RAID5 array? [closed]
As far as I know, RAID-6 has an even worse penalty on writes than its cousin RAID-5.
But we also know that we can get more performance out of a typical RAID array by having more spindles in it. But ...
0
votes
1answer
108 views
How to Check Download/Upload Speed to Web Server?
I have a web server in the US (MS Windows 2008).
Chinese users are complaining of slow speeds and SQL command timeouts. Other Asian and European users are not.How do I check the speed ...
1
vote
1answer
425 views
Poor guest I/O performance KVM Ubuntu 12.04
I have a guest VM running inside a 12.04 Ubuntu host. VM was created using the vmbuilder python script.
On the host the phoronix-test-suite "aio-stress" gives a performance speed of >1600MB/s Random ...
0
votes
0answers
142 views
RAID10 (4x SSD) system is super slow for 'dd' and 'find' commands
I have configured two servers each with 32 GByte RAM, 2x Xeon 2.4 GHz, 4x 480 GByte Intel SSD on a LSI MegaRAID SAS 9261-8i controller. They should be identical, however one of them has a very poor ...
