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

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0
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1answer
76 views

Best way to optimize site speed for a large traffic website? [closed]

I'm currently managing a Website for a client of mine who gets about about 500-1000 visits minimum a day, and this includes Members uploading videos, photos, blog posts and other content. The site ...
0
votes
1answer
168 views

mod_pagespeed own js and css render blocking

My mod_pagespeed gives a lower score because it's own js and css are render blocking. Given that the tool is designed to speed up, not slow down, I don't think this is desired behavior by design. Has ...
0
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0answers
107 views

Ubuntu server router - only 50% of upload bandwidth

I've changed my internet connection to 400 mbps download and 400 mbps upload. Real speeds when computer connected directly to optical modem: 421/412 mbps for download/upload. My network structure is: ...
0
votes
2answers
101 views

How do I prevent a website on my server causing the whole server to crash

I have a server with 6GB of RAM and a 6-Core CPU. Number of websites hosted by the server is about 10, but sometimes 2 of them take 100% CPU and almost entire RAM which cause the whole server to crash ...
0
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0answers
63 views

How do I check disk performance of LVM drive?

I have a CentOS server with 2 hard drives configured to use LVM over RAID1. How do I benchmark my hard drive? As seen in this question, I have used the following commands: # check read performance ...
1
vote
0answers
39 views

Frequent CPU spikes on fresh install

I just reinstalled my Server (Windows Server 2008 R2) and after installing MySQL 5.6, the CPU spikes every few seconds: http://s15.postimg.org/dno7ztfjf/cpuspikes.png Even worse than the higher CPU ...
0
votes
1answer
230 views

Abnormal CPU usage during Disk Write Operations

I have a decent CentOS 6.5 dedicated host (CentOS 6.5/E3-1230 3.2Ghz Quad Core + HT/16GB/Software Raid 1 SATA II/WD2503ABYX/ext4) with the default CentOS kernel and "elevator=deadline" in grub. I/O ...
0
votes
0answers
24 views

Can the estimated time of access times for distributed keyvalue stores be below 1ms?

I'm digging through various Redis/Ceph/Elliptics benchmark to determine, whenever its theoretically possible to reach (very optimistic) request completion time below milliseconds in a non-SSD ...
0
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0answers
101 views

Debian mail server's Maildir folder with too many files causing disk I/O to go on high load

I have a Debian mail server running Postfix, Courier and Maildir, with disks on EXT3 filesystem. I have noticed that when I use my webmail application (Squirrelmail, in this case). It gets some kind ...
1
vote
2answers
706 views

HP Smart Array P822 w. Dual D2700 - cabling for best performance

Reading the D2600/D2700 User guide, there's a section called "Cabling examples", but none of the examples match what we intend to do. I just want to make sure that it makes sense, before we do it. ...
0
votes
2answers
176 views

MySQL's InnoDb performance downfall

I'm trying to configure a MySQL production server using InnoDb and I can not get the performance I want out of it. I've used Percona tools to give me the following configurations: [mysql] # CLIENT # ...
0
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0answers
59 views

RAID6 Ubuntu rebuild - how to calculate best parameters for fastest rebuild

I am doing a resync on a RAID6 array and I am looking at some 2 days to complete. I looked here for hints on how to speed it up, but I have, instead, managed to slow it down! HW details are: 10x 4TB ...
-2
votes
2answers
65 views

Do domain registrar affect the ping time of your domain? How to optimize? [closed]

The background story: recently I switched to use cloudflare as the name-server of my domain(which use namecheap as registrar). I noticed a increase in ping time. Then, I moved another domain(with ...
0
votes
0answers
14 views

Scopserv System Load Average

Firstly, apologies for what will be a slightly less than technical explanation of the problem I am facing - I am not a SysAdmin and therefore have a somewhat limited understanding of the issue I'm ...
0
votes
0answers
127 views

AIX JFS2 I/O performance problems

I have a fresh installation of AIX 7.1. I noticed that JFS2 file system with logging enabled (log=/dev/hd8) is dramatically slower than one with log=NULL. Simple zip archive extraction takes 5 minutes ...
0
votes
3answers
154 views

Is it possible to use curl to accurately stress test a site that has lots of javascript?

I have a web site that has lots of javascript but simple html. I want to try simple stress tests with curl. Is that possible? If I just curl the site I get HTML. So making tons of curl requests won't ...
0
votes
1answer
46 views

Horizontal Scaling Alternatives To GFSv2 (slowness)

I'm having an infrastructure design problem with an application. Right now we access a lot of small files (under 10MB) from a GFSv2 2-node cluster. 90% of file access is "random reads" to this GFSv2 ...
0
votes
1answer
105 views

Performance and Microsoft Security Essentials Real Time Protection on Server 2008

Is it smart to turn off real time protection for Microsoft Security Essentials on Server 2008? Will this help with performance? I have it running a scan every night.
4
votes
2answers
1k views

VMXNET3 performance on Linux on ESX 5.0

What kind of performance can I expect from VMXNET3 adapter when running two Linux guests on the same VMware ESX private network defined between those guests? I use VMXNET3 adapter for communicating ...
0
votes
1answer
111 views

Improve Disk Performance of a Linux 2.4 Guest on KVM Host

I have a server running Linux 2.4, and I'd like to virtualize it using KVM. I can run it with a IDE controller, but my applications require more disk performance. The best existing solution is using ...
4
votes
2answers
331 views

Does LXC container performance depends of host load?

I am wondering if LXC could offer a full isolated benchmarking environment. Let's say we have 2 identical machines, with the same fresh Linux and without network connection. First machine has a load ...
1
vote
2answers
166 views

How to improve a Java build server's performance?

We are setting up a new server for integration build. The original integration server can finish the "mvn install" in 3 minutes in a Linux box. Now by moving to a Windows 2012 server on VM, it's down ...
0
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0answers
283 views

Poor network performance when fileshare with CentOS on HyperV

I own Fujitsu Siemens server (TX100 I guess – I am not able to check this as I manage it remotely). I have got Windows 2008 Standard R2 sp1 installed. On this server I run Hyper-V and in it I have ...
1
vote
3answers
631 views

How many IOPS do I need? My workload bottleneck is storage

How can I know how many IOPS I need my storage to deliver for my overloaded Linux server? I have a server and I know it has storage as its bottleneck. I would like the bottleneck not to be storage, ...
1
vote
0answers
179 views

SSD+MDRAID+LVM+KVM results in lower performance than expected

We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
1
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0answers
133 views

Postfix performance and how to increase my throughput?

What I've read so far: Postfix Tunning Postfix Bottle Neck Analisys The Book of Postfix (chapter 22) I have similar specs to this guy but I'm only able to send about ~1300 emails/hour What I've ...
1
vote
1answer
438 views

interpreting IOPS these Bonnie++ and iostat results

I am looking to interpret the IOPS from a few runs of bonnie++ using iostat simultaneously and using the benchmarking from this post: Can I determine IOPS on a disk array using bonnie++? bonnie++ ...
1
vote
1answer
2k views

How to troubleshoot slow performance on AWS EC2/RDS?

We recently moved our web servers from some 10 year old boxes to AWS EC2. Usage of the site is currently higher now (it's our busy season) and the site has become much slower, which is unexpected ...
1
vote
2answers
65 views

Splitting web project across multiple partitions on Linux (SSD, HDD and RAM Disk)

I've got a web project that pretty much consists of three parts: Code, Assets and Cache. I'm thinking of splitting it through multiple drives - Put my whole Code into SSD partition, Assets onto big ...
-5
votes
2answers
80 views

Hosting medium sized files - do I need a 1000mbps connection? [duplicate]

I am planning on setting up a free file hosting site where users can host files up to 1GB. I was looking at some dedicated server hosts and found one in the Netherlands that offers 50TB bandwidth per ...
0
votes
0answers
66 views

Trace Route, Slow Pings, timeouts on after server restore

I am getting bad ping times on my server, especially for large data requests. The stored procedure on the server runs at 1 second, while calling it through my web applicaiton takes 23+ seconds. This ...
0
votes
2answers
1k views

Bad disk performance on m3.medium (SSD) EC2 instance [closed]

May be I'm missing something but at a glance new SSD-based m3.medium EC2 instance doesn't provide any disk performance advantage. I didn't run benchmark tools yet, but directory copying, directory ...
-2
votes
4answers
261 views

Too many httpd processes on my Cpanel VPS [closed]

For months my VPS has been doing fine. But since last week I saw Mysql server stopped two times and I was told that it was some load issue. I don't want to upgrade due to budget issue. Yesterday when ...
0
votes
0answers
21 views

Typical web browsing profile

I am looking for a typical profile of a one day browsing session. The end goal is to realistically simulate a web proxy traffic in a mobile network. Of course the best would be to find some kind of ...
2
votes
1answer
53 views

Server load avg. hitting 16-20, but all resources under 90% usage?

As you can see in the image shared below, the server load peaked to almost 20 but the CPU, RAM, DISK IO and Network I/O remained well under their full capacity. My question is: 1). What caused the ...
1
vote
1answer
129 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 ...
0
votes
0answers
30 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
votes
1answer
105 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: ...
-1
votes
1answer
54 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 ...
0
votes
2answers
38 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 + ...
1
vote
4answers
451 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 ...
-1
votes
3answers
436 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 ...
0
votes
1answer
166 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 ...
2
votes
0answers
716 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 ...
0
votes
2answers
128 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. ...
0
votes
2answers
36 views

Apache Configuration not use server capabilities

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. ...
2
votes
0answers
87 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 ...
0
votes
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
vote
1answer
267 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 ...
0
votes
0answers
58 views

What is a good set of performance counters to measure scalability bottlenecks

We're moving our enterprise product to the cloud (IAAS) and are determining how many users we can support on a single VM. Our product uses SQL Server, SharePoint and a bunch of WCF services. What ...