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• Does data mining qualify as an abuse?

  - by Hybryd

  Hi all, today I had a strange experience with my ISP. They disabled my password for internet connection, and when I called them, they enabled it again, but they didn't say why it happened. In the last couple of days I was running a data mining that I made for one forum to get some useful info about business that I'm in. So I thought, maybe my ISP figured that 10,000 page requests in couple of hours to the same site may be some kind of attack. What do you think, does it qualify as an attack? Is it even ok to data mine in that way?

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• How SSD hard drive affected speed of your website (asp.net/linq/ms sql database)

  - by Sergey Osypchuk

  I have a small database (<1G) But we have a lot of complex logi? in website and client complains on render time, which is 3-5 seconds. We are not google, and thousands of users a day is our dream, so size is not a problem, but speed is important. Can anybody share with experience with SSD drives for ASP.NET (MVC)/LINQ/MS SQL based application ? How you performance increased? UPDATE: this whitepaper states that it will be 20 times faster. http://www.texmemsys.com/files/f000174.pdf

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• Optimal dir strcuture for keeping millions of files on an ext4 system

  - by Alex Flo

  I need to keep millions of files on an ext4 system. I understand that having a structure with multiple subdirectories is the general accepted solution. I wonder what would be the optimal approach in terms of number of dirs/subdirs. For example I tried a structure like 16/16/16/16 (that is, (sub)directories from 1 to 16) and I found that I am able to move 100K files to this structure in 2m50s. When trying to move 100K files to a 8/8/8/8/8/8 structure it took 11 minutes. So the 16/16/16/16 approach seems to be better but I was wondering if anyone has some empirical experience with an even better dir/subdir distribution.

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• Microsoft InTune in a SBS2008 Environment

  - by Richard Craddock

  I'm looking into using InTune and Office 365, mainly for the licensing benefits it brings but also because our company is moving to having more users based around the globe and I feel it will make managing the computers easier. Currently we have a SBS2008 (Premium) server running Exchange and File and Print which I need to keep for File and Print (Exchange can move to Office 365). I cant find any information on how the AD is synchronized between InTune and the SBS server (as users will still needs access control to file shares on the SBS server). Does anyone have any experience in doing this or even know if its possible? Richard

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• What happens if an OpenStack cloud controller dies?

  - by magu

  I've been reading up on OpenStack and how we can re-create an EC2/S3-style cloud for our internal development and I'm having a hard time finding information on how the OpenStack cloud controller provides redundancy of the cloud management services. I know I can setup multiple Swift and Nova nodes, but not a single document/article/howto/wiki contains information on: a) what happens if the cloud controller node dies; and b) how to setup redundant cloud controllers. It seems to me that, although it is massively scalable, there is a big single-point-of-failure built into OpenStack. Can anyone with more experience on OpenStack please shed some light as to how it all works in regards to high-availability?

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• Is SmoothWall a good firewall alternative?

  - by Oden

  I found this linux distribution, called SmoothWall. I read its documentation and it looks pretty for me. The only problem is, that I'm not a big linux professional and I have also not a lot of experience but I want to know your thoughts about this "Firewall OS"! Can it be used for small-business environment, with 15-17 PC-s? I would use the server also as cache proxy. Is this a good idea? (I mean, using one server for two things)

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• Alerting when a RAID Array disk fails locally on VMWare ESX or ESXi System

  - by Tim K

  With ESX and ESXi, we recently had two systems where that the boot partition became degraded due to a failed disk. The only alert we managed to capture was the visual alert on the Dell servers. We failed to received any electronic alerts regarding the failed or degraded array. Does anyone have any experience with monitoring for these types of failures? In both cases, the servers were running in a RAID 5 SCSI configuration (5 disks on one system, 3 disks on another) which if we were running a Windows Server OS, we would have had an alert created in the Eventviewer. Where would I begin to look for this solution. Can it be configured in VCenter or vFoglight?

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• Dell Power Edge R515 - Replacing a Bad Hard Drive in a RAID

  - by LonnieBest

  I've ordered a new hard drive to replace a bad one in a Dell Power Edge R515. The manual covers obvious topics regarding physical replacing of hard drives, but I've never done this before on a production server where RAID is involved. I've heard people talk about this topic, and I've heard that some servers have RAID controllers that are smart enough to allow you to just put in the new drive (hot swap), and then the server will know automatically how to rebuild that drive to be what the old one was to the system. Where do I find the proper procedure for replacing a failed hard drive on a live production Dell Power Edge R515? Can someone with experience tell me how easy or hard this usually is?

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• SSL certs or intermediate for DMZ

  - by rex

  I've been tasked with deploying and managing load balancers covering internal servers and DMZ servers. I have no experience with this, and this is a first for my organization as well. Balancers are up, running, legit. Currently we are using a self-signed cert for Exchange/OWA. I know that we should have a cert signed by a CA, but the balancer has options for SSL cert or intermediate cert, and I'm unclear on the difference, or on which we need. We will be hosting Lync, Exchange and some custom apps in the DMZ. disclaimer: Apologies up front, I'm desktop support. I recently passed my Net+. It seems that has made me the network engineer in this organization.

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• Using wifi router as bridge to increase signal?

  - by overtherainbow

  A friend of mine lives in an appartment building whose structure is such that wifi signal is very weak. Even a USB key won't work. I was thinking of buying an entry-level wifi router and reconfigure it as a bridge to act as repeater. Would that increase the chance of getting a good signal, or I shouldn't bother? If experience shows that it does improve things significantly, is their another router I should look at besides the Linux-based Linksys models? Thank you.

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• What are the minimum required modules to run WordPress

  - by Mister IT Guru

  Recently a 'consultant' came in to talk to bean counters at my place of employment, with regards to being more efficient with our IT infrastructure. They suggested to be more efficient we should only load the Apache modules that are required on our web servers. (This is just 1 of 1Ks of suggestions). The Bean Counters are very excited, and prepared for me to spend the time to investigate this avenue of cost cutting. I don't mind this mundane exercise, I see it as a learning experience! I guess this leads me to the actual question: How can I determine the minimum required apache modules for a PHP based application without actually going through the code, or plain old trial and error?

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• How do I create DNS entries for EC2 instances created by Auto Scaling?

  - by Evan

  I'm looking into using auto scaling groups for a tier of webservers that would be fronted by an ELB. One of the things I'm having a hard time with is how to give each new instance the proper DNS name. For example, I'd like webservers to have names like frontend-web-XXX.prod.example.com so their names would appear correct in logs and just ease of organization. I have two other tiers I'd ultimately like to make autoscaled and I'd like them to have names like api-web-XXX.prod.example.com as well. I have some experience with cloudformation templates and have spun up individual instances with associated Route53 records but I don't see any indication of how this can be done within an autoscaled group.

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• Best technique for reusing a Windows system image across configurations

  - by Martin Wiboe

  We are a small company that provides solutions for ventilation systems. Part of the solution is a "controller" which communicates with the ventilation equipment. These controllers are simply Dell computers that come with our Windows 7 system image on them and sometimes some special hardware. We typically do a batch of 10 controllers at a time. We have been using Norton Ghost to apply the system image, but this process breaks because Dell changes the system configuration often, and our Windows image now does not contain the correct drivers. This is especially a problem when they change the RAID controller. To improve this, I see 2 options: use some kind of virtualization and install a hypervisor on each PC. This would solve the driver problem, but probably cause trouble with our special hardware. use some method of adding the proper drivers to our Windows image in offline mode. I haven't got much experience in either of these approaches. How would you solve our problem?

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• 1tera flop cluster?

  - by Adobe

  I want to buy a $40000 1 tera flop cluster to keep it in a room. What are the standard configurations? Cluster is supposed to do molecular dynamics simulations on biological systems. I'm proposed a 4 pc with 8 cores each by the selling company I'm deadling with. It looks like I also need infiniband. Does some one has an experience -- what phisical memory should I buy etc? I know things change very quickly... Still there might be a point or two to state. Edit: OS is supposed to be linux, application is gromacs.

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• Xen and Ubuntu?

  - by wag2639

  How does one properly approach having Ubuntu servers on a Xen hypervisor? I don't have any experience with RAID or Xen other than from a theoretical level. Additional requirements: Use with mdadm Software RAID 5 (can be on separate disks) that multiple instances with access Paravirtualized Ubuntu Server guests instances Possible ideas for now: Ubuntu host (dom0) with ubuntu-xen-server package (this purportedly isn't supported) dom0 host will "own" RAID 5 partition More Ubuntu servers as guests Citrix XenServer bare-metal host XenServer will own RAID Citrix XenServer bare-metal host Ubuntu guest instance creates and owns RAID Questions and concerns: Can Ubuntu be used as a dom0 Xen host? Can XenServer install packages such as mdadm and create a partition? Can multiple guest access (R + W) to the same data partition (RAID)? Note: since it may have a bearing on support, I'm referring to Ubuntu Server 10.04

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• xinet vs iptables for port forwarding performance

  - by jamie.mccrindle

  I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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• Test-service on Internet for testing incoming INVITE

  - by leiflundgren

  I am trying to set up Asterisk at home. I think I'm having trouble configuring my firewall, so that inbound traffic is accepted, but I am not sure. I got the idea that, perhaps, there is a service out on the Internet, where I can, though a web-browser, initiate an incoming call, an INVITE. And then see the SIP-trace that the remote-part experience. Anyone know of such a service? Note. I have a SIP-PSTN provider so I can generate inbound calls. But I cannot see the SIP-logs from my provider...

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• Internet problems

  - by dan

  I've got problems on my freshly installed windows Xp machine. I cannot connect to the internet and I've tried various 'solutions' provided to me by the help and support center. Surprisingly none of them worked... Anyways, I've got 3 pc's next to me sharing a lan which is connected to the internet though a modem. The computer I use right now uses windows xp aswell and runs without any problems. I've tried everything on not working computer. I've ran the connection wizard several times, but it's not working :( Also I've very little experience with this version of windows, so I'm sorry if the solution is obvious.

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• txt file descriptor in lsof

  - by wfaulk

  In my experience, files that have the file descriptor of txt in lsof output are the executable file itself and shared objects. The lsof man page says that it means "program text (code and data)". While debugging a problem, I found a large number of data files (specifically, ElasticSearch database index files) that lsof reported as txt. These are definitely not executable files. The process was ElasticSearch itself, which is a java process, if that helps point someone in the right direction. I want to understand how this process is opening and using these files that gets it to be reported in this way. I'm trying to understand some memory utilization, and I suspect that these open files are related to some metrics I'm seeing in some way. The system is Solaris 10 x86.

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• Cheapest High Available Web Server [closed]

  - by xyz

  I would like to create a high-available setup (e.g. a small cluster) for a webserver, i.e. it will run Apache, PHP and MySQL. There will be between 2-8 small websites running with only very little traffic and workload. High availability is however very important. I don't want to be dependent on 1 datacenter, so there must be a minimum of 2 servers placed in different datacenters, and if one server goes down, the user must experience no or only a minimum of downtime - and no data loss. I have considered Amazon AWS using their Elastic Load Balancing, since it is possible to buy 2 EC2 instances in 2 availability zones and set up load balancing and RDS (Multi-AZ). However this seems rather expensive. Using the AWS price calculator http://calculator.s3.amazonaws.com/calc5.html it totals to 185$/month the first year (including the free tier). Are my calculations incorrect or is there a cheaper way to make this HA setup? Best regards

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• How can I share files from my Windows 7 machine to my friend's Ubuntu machine?

  - by ProfKaos

  I run a Windows 7 Pro SP1 laptop as my home machine, and my housemate runs an Ubuntu 12.04.1.05 desktop. We share a WLAN. I would like to make certain locations and files available for him to read and maybe write. How can I go about this? Bearing in mind I have very little recent experience with modern Linux, and Ubuntu in particular. My first idea is to share a Windows folder with my Ubuntu VM under VMWare Player, then his Ubuntu machine can connect to my Unbuntu VM, and the two can use whatever magic Ubuntu uses to achieve file sharing. This requires my Ubuntu VM to be always running though, and that may not always be possible. I have also heard that Samba may have a feature to help here, but I know nothing about that. How can I share my Windows files with my mate's Ubuntu machine, preferably with a 1 to 1 connection, i.e. rather not using shim VM's

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• 250k connections for comet with node.js

  - by Nenad

  How to implement node.js to be able to handle 250k connections as comet server (client side we use socket.io)? Would the use of nginx as proxy/loadbalancer be the right solution? Or will HA-Proxy be the better way? Has anyone real world experience with 100k+ connections and can share his setup? Would a setup like this be the right one (Quad core CPU per server - start 4 Instances of node.js per Server?): nginx (as proxy / load balancing server) / | \ / | \ / | \ / | \ node server #1 node server #2 node server #3 4 instances 4 instances 4 instances

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• Unable to map to web folder using WebDAV client on Windows Server 2008 R2

  - by user74989

  Hello, I have a client running Windows Server 2008 R2 on several servers. One of the servers is also running SharePoint 3.0 and my client has created a web folder to map to. I can map to the web folder from all Server 2008 R2 boxes that have the WebDAV client (part of Desktop Experience feature) installed, except for the server the folder resides on. When I attempt to map to the web folder on the server which the folder resides, I am repeatedly prompted to enter my credentials. I am using the same account that I used to map the web folder on the other servers. I have also tried mapping from the command line and receive 'Access Denied' What may be causing the problem? I would think that if I can map to the drive from one server, I should be able to map the drive from the rest as long as the WebDAV client is installed, especially on the server where the folder is located. Jesse

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• ESXi - Should failover node be in the same geographic location?

  - by Ryan

  For some reason it seems to me that at least one failover should be in the same building. But really I have no idea. Could there be an issue with routing delays for users during a failure? I'm just imagining reasons at this point. Let me know, should at least one failover node be at the same geographic location as the other? I am trying to prevent what appears to be a poor decision so any feedback or life experience you can share would be grand. Will mostly be running Windows Server 2008 with SQL Server 2008 as our guest OS.

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• outgoing mail for web app (multiple domains as sender)

  - by solid

  I have a web app "myapp.com" that users can use to set up their own websites. Our application is written in php and should be able to do the following: send mails to our own users "from: [email protected]" send mails from our clients to their clients "from: [email protected]" We don't need to take care of incoming mails, just send out mails with the correct from and reply-to addresses. We cannot make this work using Google Apps (limited to our own domain in the from-field) and we cannot make google apps or google apps domains for all our clients, so we are looking for another simple to manage and set up solution. Does anyone have experience with this, please let me know! Thanks

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