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

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3answers
573 views

What is the maximum speed of ADSL?

As wikipedia says the max speed of ADSL is 24.0 Mbit/s. However here it writes that Japan provides ADSL service with speed 50 Mbit/s.
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2answers
608 views

Linux NFS performance vs other FSs

It is expected that NFS will be slower than any "normal" file system such as EXT3. Transferring files over the network is the main reason for the additional delay. I am wondering how NFS can be ...
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4answers
577 views

Suggestions for recommended file system for Linux server

There are many file systems for a Linux server administrator to choose from. Also, it is not always an easy task to figure out the appropriate layout and optimal file system for your needs. Can you ...
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3answers
142 views

who is responsible for server monitoring? [closed]

who is responsible for server monitoring ? development team ? development team leader ? Project manager ? dba ? infrastructure team ? who is responsible when application server is running slow or ...
0
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1answer
69 views

bench marking windows machine - [closed]

We have a Java based product that is mainly used on windows. Some customers complain that application is slow. We have analysed product using JProfiler and improved various bits. As a next step, it ...
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1answer
1k views

Identifying what is causing High IO (Linux, Ubuntu)

Your Linode, linodeXXXXX, has exceeded the notification threshold (1000) for disk io rate by averaging 1079.99 for the last 2 hours. That's what I've been getting in my email for the past week, ...
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5answers
903 views

Poor performance on Windows Server 2003 R2 x64

My current setup is the following: Intel Xeon 5620 2.40Ghz 16GB RAM 1000GB disk Windows Server 2003 R2 x64 I'm having a really poor performance with this setup. I have some previous experiences ...
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2answers
1k views

Poor performance from SAS disks on HS22 blade in CentOS/RHEL on ESXi 4.0

I have an HS22 blade configured with two 600GB 10K 6Gbps SAS drives configured in RAID1 using the onboard LSI Logic controller. Running on it is VMWare ESXi 4.0u2, and on top of that are a couple VMs. ...
3
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2answers
589 views

Which part of of a hard drive has the highest throughput, beginning or end of drive?

If I create a partition at the end of the drive does that create the partition on the outside of the platter where the data is passing under the drive heads fastest?
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2answers
2k views

How does Round Robin verus Sticky IP affect performance

I am analysing a performance problem on a Load Balanced WSS 3.0 site. The site uses Round Robin load balancing and Windows autentication with NTLM. One of the problems appears to be excessive http ...
0
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1answer
674 views

Setting MySQL table_cache variable

Greetings, I've set the table_cache variable in /etc/mysql/my.cnf on Ubuntu to 512, but the reported value is only 64. How can I fix this? Thanks
2
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2answers
426 views

Use a reverse proxy do record all incoming HTTP request, then execute it in a clone server for performance testing

A few weeks ago I went to a presentation where a guy said that in his company he used a reverse proxy that records all incoming http requests to the production server. Then he can execute them on ...
0
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1answer
2k views

sc-win32-status 121 and 1236 in IIS log

I am trying to solve some performance problems. We have a web server that calls another web server with WCF services installed. There are about 20,000 calls in 1 hour, most are a few milliseconds. ...
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4answers
139 views

how can i record maximum amount of memory used over time in a linux server

I plan to launch an app, and plan to set its available memory optimistically high (it's a VPS). How can I figure out, say looking a month later, what it's maximum usage over that time was, i.e. if it ...
0
votes
2answers
409 views

Minimizing response time, maximizing requests/second

I'm testing out various Ruby on Rails hosting solutions, including nginx, apache, a couple of various ISPs and cloud computing systems, etc. I'm noticing that, when there's only one or two ...
1
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4answers
2k views

Slow VM on esxi 4.1

We have a FreeBSD 64bit running on a esxi 4.1, the hardware platform is a DELL R710 with 2 x 56xx (intel 6core cpu) and 48 GB ram. The FreeBSD vm is very slow, when we compiles/builds something on it, ...
2
votes
1answer
757 views

Recommended technology for layered disk cache in linux

I originally asked this on superuser but it occurs to me it's more more of a server topic. I've just bought a 6-core Phenom with 16G of RAM. I use it primarily for compiling and video encoding (and ...
0
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3answers
279 views

Linux kernel multiple file system drivers and performance

I am not sure how Linux kernel handles multiple file system drivers and if an inode lookup for each given mounting point in file system interferes with other mounting points, or is there something ...
0
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2answers
559 views

How many NGinx redirects is too many?

I'm working on a news centric website thats been around for years and is steadily accruing more and more page redirects. Currently we have around 375 redirects and are adding about 5-10 a month. I ...
1
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3answers
3k views

How much performance is gained from setting NtfsDisable8dot3NameCreation = 1?

You can tune NTFS with different parameters in the registry and an TechNet articles states that you increase file performance by setting NtfsDisable8dot3NameCreation to 1 in the registry. In real ...
0
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2answers
11k views

what is the throughput of 15K RPM SAS drive? [closed]

bandwidth for a single 15K RPM disk ? 10MBps or 100MBps?
3
votes
2answers
7k views

VMWare Workstation virtual vs physical disk?

I recently started playing with VM and saw that I have 2 options when creating a VM, I can use a Virtual Disk or a Physical Disk. I belive using the physical disk would be faster and better and I ...
0
votes
1answer
155 views

Pros/Cons of different backplane architectures?

Are there some general resources (other than spec sheets of boards) to compare the differences between computing formats like VPX, VME, IBM bladecenter-h, etc? I am tasked with doing some legwork ...
2
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4answers
239 views

What's the fastest way to server a single static webpage from a single server in memory?

Been dealing with growing demands for system resources on a website, and got me thinking: What's the fastest way to server a single static webpage from a single server in memory? Feel free to ask ...
2
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2answers
114 views

Is this server specification good?

Sorry for this newbie question, but I was going to order this server to run my PHP and MySQL web application, I'm doing a project for the students in my class, and it's going to have about 1000 users ...
1
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2answers
2k 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
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2answers
134 views

What is the best high-performance solution for server side

We are building the server side of some gaming platform where a great load of mobile devices (thousands, if not tens of thousands) connect to a server, send some small information each second (let's ...
0
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3answers
592 views

Performance problem on a VMWare ESX virtual hard drive

I have performance problems on a virtual hard drive on a VMWare ESX 4.0 virtual machine. See the weird following sequential read speed graph: I passed the test several times, and the shape is ...
0
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2answers
287 views

MySQL CPU Usage at 99%

We have a Java based SaaS application running on MySQL database on a 2 GB Linux VPS. Recently we added RAM to the server and since couple of days, MySQL is taking up 99% of CPU usage. We are quite ...
0
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4answers
3k views

Performance Monitor w/ SQL Server - how many counters is too many?

I'm doing some performance analysis using the built-in Windows Performance Monitor, both on general hardware and SQL Server. I've been reading a lot about which performance counters to use; in ...
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4answers
102 views

Switched hosting - MySQL became 10 times slower

I've switched web hosting recently. The new box is slower than the old one (it's VPS vs. dedicated). However, performance testing reports that a good portion of the slowdown is database-driven. I ...
4
votes
1answer
2k views

Does increasing the journal size improve performance for ext4 filesystems?

There is an article on linux-mag which says that increasing the size of the journal on ext4 filesystems actually improves filesystem performance for very large partitions. I'm wondering if anyone ...
0
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1answer
902 views

How to design high performance CIFS/SMB

Would it make sense to virtualize windows using Xen or VMware ESX and expose storage on a JBOD as NFS, instead of exposing storage as CIFS/SMB for better I/O throughput? Is it true that the below can ...
1
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1answer
481 views

Mod_WSGI 6X Slower Than Django Development Server

I've been trying to figure why my Django Development Server is running 6-10x faster than mod_wsgi (which is supposed to be faster). I believe it must be restarting the Django process between requests, ...
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2answers
320 views

Will deleting old MySQL data improve performance?

Would deleting old data from my tables improve MySQL query performance? When my queries use indexes? When my queries don't use indexes? When I use InnoDB? When I use MyISAM?
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2answers
422 views

Thresholds for Linux performance metrics

What are recommended threshold for Linux performance metrics? I'm collecting statistics from remote servers using rstatd. On which values should I issue warnings? errors?
2
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1answer
339 views

Are Windows performance counter data points providing snapshots or averages of the prior interval?

I am wondering specifically about the "Process/% Processor Time" counter. If you set it to an interval of say 10 seconds, are the data points a snapshot of what the CPU utilization is at that 10 ...
0
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1answer
155 views

Which is the most efficient way (performance) to add functionality to MediaWiki?

I know of three ways to enhance MediaWiki functionality: Using extensions. Using templates. Changing MediaWiki:Common.css & MediaWiki:Common.js My question is, when I can choose which to do, ...
1
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3answers
249 views

How to calculate actual gain from CDN?

I'm testing out a new CDN service (http://cloudflare.com), and I'm trying to figure out if it is giving much of a gain. I have a very fast internet connection so I can't see any increase in speed ...
0
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2answers
119 views

Simple checks to make my HTTP server faster

I am running my own webserver on a 384MB VPS from Slicehost to serve a Ruby on Rails application. I am running Phusion Passenger with Apache2. I currently expect anywhere between 10-200 visits per ...
1
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1answer
464 views

147GB vs. 146GB HP Drives

I'm kind of scratching my head here. One of our clients has a DL180 with 4 x 146GB SAS drives, they show up in ACU as 147GB drives. We ordered spares from HP, and they show as 146GB in ACU and ...
1
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1answer
827 views

How can I create an event trace with logman.exe on W2K8?

For various reasons, I'd like to get a trace of disk accesses on some Windows Server 2008 machines. I can set up a user defined data collector set in the Reliability and Performance Monitor tool to ...
0
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2answers
173 views

big difference in HTTP response time between US and UK clients

I am looking into a problem with some images hosted in the US, that some users get really slow load times. This image for example; ...
0
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2answers
1k views

windows 7 explorer to remote server 2008 r2 shares: green bar driving me nuts!

Whenever I access, with my local Windows 7 explorer in details view, a remote share on our production servers containing our own xml log files, the location bar turns into a green progress bar that ...
2
votes
1answer
193 views

mysql query monitor

I have mysql server. I need a free monitor (something similar to the mysql enterprise monitor http://www.mysql.com/common/images/enterprise/EnterpriseDashboard.png). I need the graphs to be in ...
3
votes
1answer
315 views

What are some current and relevant benchmark tools for Linux?

I'm specifically interested in benchmarks that approximate or target real in the wild usage scenarios. My main areas of focus are latency, network performance (incoming data over sockets). ...
0
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3answers
458 views

howto measure network bandwidth/perf

we have a corporate LAN of approx 200 nodes behind a firewall and recently upgraded bandwidth of ISP. Now we want to measure the performance / bandwidth (internet as well file copy perf on local ...
1
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2answers
393 views

Overloading a Windows SQL server

We've been looking at a SQL based legacy system for the past few months trying to improve performance and have done as much as possible with the code base so now we're turning our attention to the ...
1
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2answers
1k views

Best practice with huge VM disks, NFS mount or huge image file?

I am looking into a backup solution, it will run on a virtual machine located at our KVM-host. The question is wether it is best to use a LVM-volume on the host and mount that with NFS into the guest ...
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3answers
2k views

Certain SQL queries performing very poorly in ESXI hosted environment

We recently set up a new machine with 8 dual-core CPUs, 20 GB RAM, and 3 1-TB drives set up in a RAID of some sort resulting in 2 1-TB drives we actually get to use (I'm not the hardware guy here). ...