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• Diagnose cause of long running requests in IIS 7.0

  - by Shlomi Fruchter

  We are running an ASP.NET web application on IIS 7.0, Windows Server 2008 R2, with SQL Server 2008 R2 for DB. On weekends, when the traffic is high, the request queue length in the IIS servers increase (up to 800 requests) and then drops, every minute or so. I can see that the servers are handling some requests which, according to the 'Current Requests' view in IIS Manager, are long running (thier Time Elapsed value ranges from 20 to 50 seconds). Those requests are not necessarily heavy queries, actually, I can't understand why they are taking so long. Can it be because the client is closing the connection on his side? Thanks, Shlomi

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• What software works well for viewing massive TIFF images on Windows 7?

  - by nhinkle

  Today I saw an article about a half-gig, 24000 square-pixel high-res composite image of the moon. (This is a much smaller version of the image) I find astronomy interesting, so I thought I'd download it and take a look. With 4GB of RAM and an i5 processor, I figured my computer could handle it. Unfortunately, the built-in Windows Picture Viewer didn't do such a great job. While it opened the file without a problem, zooming in was ineffective. The zoomed out image loaded, but zooming in just showed a scaled-up version of the zoomed-out version, not any detail: Closing the picture viewer also took a very long time, and the whole process used up much more RAM than the 500MB of the picture (usage went from 1.3GB to 3.8GB). What other software would work better for this? I would prefer something that is free and fairly simple. I don't really want to use an editor (like photoshop or GIMP), just a nice lightweight viewer. Any suggestions?

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• Why does my company's software download get blocked by anti-virus programs when downloading from the company website but not other websites?

  - by Adam Burgess

  My company distributes software via website download off of a URL that is on our company's website. The download is an .EXE. We are getting calls from multiple customers saying the download is being blocked. We can help them download by turning off the virus-scan software, but wondering what is causing the block. Here are the details: We have other downloadable .EXEs that download fine without being blocked from the same company website. Our problem download file downloads fine from other websites (i.e., Dropbox) without being blocked. In summary, this one particular download from our company website is being blocked by various anti-virus programs a high percentage of the time. Any suggestions?

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• Wordpress Installation on Two Servers - Loadbalancing

  - by rihatum

  Hi All, I have to install wordpress (One Blog, one domain, for e.g. mycompany.com/blog) on two servers sharing one database on a different server, these two servers are behind a loadbalancer and the db would be on another server. We are planning this way due to high traffic. I have done standalone wordpress installations on a single server, on windows 2003, 2008 with IIS6, 7 etc I am just researching as to how would I implement this. What would be the steps to achieve this and upon searching I saw some posts regarding the wp-content/uploads directory to be synced at regular intervals ? your help much appreciated Thanks for reading

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• Purpose of JBoss tables

  - by Rich

  Hi Can anyone point me in the direction of some documentation (or provide the information here) about the following tables, created by JBoss 5.1.0 when it starts up? I know what they are for at a high level, and know why they are there, but I could do with some lower-level documentation about each table's purpose. The tables are: hilosequences timers jbm_counter jbm_dual jbm_id_cache jbm_msg jbm_msg_ref jbm_postoffice jbm_role jbm_tx jbm_user I know that the first two are associated with uuid-key-generator and the EJB Timer Service respectively, while the rest are associated with JBoss Messaging. What I want to know is something along the lines of "jmg_msg stores each message when it is created...", that kind of thing. I wasn't sure where to ask this question, ServerFault or StackOverflow, but I decided it wasn't programming related so thought I should put it here - I hope that's ok! Thanks Rich

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• Am I using too much memory? (Rails on EC2 with Resque)

  - by Stpn

  I am looking at the memory usage of the Rails application (it uses background processes via Resque) and since the common answer to the question, "how many workers is too many" was "test and see", I ran some memory commands and wonder if someone can help figuring if the memory usage is high enough already, or I can still add some extra workers.. so (this is all under the maximum load): $ free -t -m total used free shared buffers cached Mem: 1756 1532 223 0 12 229 -/+ buffers/cache: 1291 464 Swap: 895 10 885 Total: 2652 1543 1108 $ vmstat procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 10588 156172 13400 326476 1 6 4 0 5 4 1 0 99 0 If there is any extra info I can provide to help answer this, I would be happy to do so. If the question is strange in some way, please let me know I'd be glad to fix etc..

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• No Sound from headphone jack

  - by Tural Teyyuboglu

  I have DELL Inspiron N5110 laptop. Using windows 8. Recently I got an issue: The problem is, when I insert headphones and microphone into laptop, I get only microphone inserted notification. Laptop detects microphone But no headphones. In fact, It mutes sound from it's speakers. But no sound from headphones too: I tested headphones separately: they're working well. I also, reinstalled windows default sound drivers and IDT High Definition Audio drivers several times. No success! The final decision is: There is no sound from headphone jack in laptop. Any suggestions?

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• Taking an image backup of an entire server?

  - by WarDoGG

  I am currently using a dedicated server for my hosting needs. However, the costs are too high and I would like to suspend everything until I work out my business strategy again. Is there a way I can take a complete backup of the filesystem and run it in VMWare ? I cannot just copy the entire filesystem because there are lots of tools installed and tight changes to the server configuration files I myself dont know about (by the developers), but I need a snapshot of the entire disk image along with processes installed and everything is as is because for development needs, I need to work on this copy in VMWare or VirtualBox etc. Is it possible for me to take a full image copy ? How do I do it ?

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• Funnelling http traffic

  - by spencer p

  I have a situation where a large batch of servers (X), on demand, need to request data from a smaller set of web servers (Y). The worst case scenario is if all servers in X decide to fetch different requests to one server in Y. That would be X amount of connections, which could be a very large burst of traffic. The best case scenario is if 1 server in X hit 1 server in Y in tandem. Life does not work like this. One idea to entertain is placing a proxy, similar to squid between X and Y. All of X servers can connect to this proxy, but would result in a few persistent (http keepalive) connections to Y. If The few were say, 3 or 4, then it would funnel. If we could then rate limit those connections and traffic decides to spike unusually high, we wouldn't hurt anyone but ourselves. Thoughts?

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• What kind of SSL certificate do I need?

  - by Christoffer

  Hi, I want to install HTTPS on my server and I wonder what kind of certificate I will need and where I can buy it. The site is a web application that demands high security by it's users since they store sensitive business data. I am also integrating a third party payment gateway into the register process of the site and need a secure way to send credit card data one way. I do not intend to store this data in our own database. So, what do I need? And also, how do I install it on Ubuntu Server 9.10 / Apache2 ? Cheers! Christoffer

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• How to troubleshoot latency between 2 linux hosts

  - by Jimm

  The latency between 2 linux hosts is about .23ms. They are connected by one switch. Ping & Wireshark confirm the latency number. But, i dont have any visibility into what is causing this latency. How can i know if the latency is due to NIC on host A or B or the switch or the cables? UPDATE: The .23 ms latency is bad for my existing application, which sends messages at very high frequency and i am trying to see if it can be brought down to .1ms

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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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• latency, regular alternations. Pfsense, network

  - by Tillebeck

  Any idea why grapgh is a shown? It i two pfsense boxes and I have not looked into where they ping to and if it is related to the server they ping. Trafic graphs are following a normal 24 hour cycle and not related to either of the latency graphs Img1: High frequent ulteration in latency. Just started a few days back. Peaks are not perfectly regular but varies from 40min to 1hour Img2: This is a different router on another internet connection. Most of our routers shown this kind of latency graphs - so for our setup it is "normal". Please note that second graph is for a whole week and not just some hours

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• Understanding ESXi and Memory Usage

  - by John

  Hi, I am currently testing VMWare ESXi on a test machine. My host machine has 4gigs of ram. I have three guests and each is assigned a memory limit of 1 GB (and only 512 MB reserved). The host summary screen shows a memory capacity of 4082.55 MB and a usage of 2828 MB with two guests running. This seems to make sense, two gigs for each VM plus an overhead for the host. 800MB seems high but that is still reasonable. But on the Resource Allocation Screen I see a memory capacity of 2356 MB and an available capacity of 596 MB. Under the configuration tab, memory link I see a physical total of 4082.5 MB, System of 531.5 MB and VM of 3551.0 MB. I have only allocated my VMs for a gig each, and with two VMs running they are taking up almost two times the amount of ram allocated. Why is this, and why does the Resource Allocation screen short change me so much?

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• Amazon EC2: how to find out detailed CPU usage?

  - by j0nes

  I am running several EC2 instances, and I want to know the exact work my CPU is doing. On "normal" machines I am doing this with munin and its CPU plugin which looks at the statistics provided by /proc/stat. On my EC2 machines however, I get incorrect graphs. The machine has two cores, so the max CPU usage should be 200% - however it gets as high as 400%: I know that I should use Amazon CloudWatch to see the total CPU usage (and this is the official and recommended from Amazon way to do this), but I am specifically looking on how the CPU usage is spend (e.g. system, user, iowait). Is there a way to get detailed CPU usage statistics on EC2 instances?

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• Time randomly changing itself, internet randomly dying

  - by Vee

  Operating System MS Windows 8 Enterprise 64-bit CPU Intel Core i7 2700K @ 3.50GHz 45 °C Sandy Bridge 32nm Technology RAM 8,00 GB Dual-Channel DDR3 @ 800MHz (8-8-8-24) Motherboard ASRock Z77 Extreme4-M (CPUSocket) 40 °C Graphics SMXL2270HD (1920x1080@60Hz) M2094D-PZ (1680x1050@60Hz) 896MB GeForce GTX 275 (CardExpert Technology) 57 °C Hard Drives 466GB FUJITSU MAXTOR STM3500320AS (SATA) 39 °C Optical Drives ASUS DRW-2014L1T Audio High Definition Audio Device Hello everyone, I installed Windows 8 RTM a few weeks ago. It's not my first time installing it, but it's the first time having two annoying problems: 1) Randomly, the system clock changes time all by itself - to fix it I have to open the time window and sync it with the internet. 2) Randomly, internet connection stops working - to fix I have to run troubleshooting. Windows will find a problem with IP on the "Ethernet" connection and fix it. 3) In rare occasions, my PC freezes and I need to restart it (a BSOD once happened, but after that only freezes) How can I permanently solve these problems? This is what I've already tried: Reset Virus scan Stop/reset the Windows Time service Disable/re-enable Windows Time automatic internet sync Change time from BIOS Change motherboard battery

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• Practical way to set up an email inbox for testing?

  - by Ben Collins

  I need to test a high-volume email application. Up to now, I've just been using gmail ad-hoc aliases ([email protected]) to receive emails and see that the content is right. However, I now need to verify a recipient list, which means I need to get every single email that goes out on a particular test run. The problem with Google isn't clear, but there's some throttling somewhere (perhaps from SendGrid, who is my delivery provider), and only a very small number of those emails ever make it to my acount. So: what's a practical way to get where I want to be? Is there a way to get gmail to just accept everything? Is there a web app / service somewhere that will let me throw up a fake email address that can receive for a large number of recipients? Is there something else?

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• Esxi with iSCSI SAN slows down with many multiple VMs running

  - by varesa

  I have a server with ESXi 5 and iSCSI attached network storage(4x1Tb Raid-Z on freenas). Those two machines are connected to each other with Gigabit ethernet, and a procurve switch in between. After a while, if I have many(4-5 or more) vms running, they start to get un-responsive (long delays before anything happens). We are trying to find the reason behind this. Today we looked at esxtop, and found that DAVG of that iSCSI LUN stays at 70-80. I read that +30 is critical! What could be causing those high response-times?

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• How do I disable microphone volume auto-adjusting?

  - by balpha

  My coworkers started yelling at me today because apparently I started screaming in their ears during a Google hangout. And sure enough, when I go to the Microphone settings dialog, I can see the level being auto-adjusted constantly; sometimes way too high. I don't think this has happened previously; at least nobody ever complained. Can I find out who is doing that auto-adjusting, and more importantly, can I turn it off? I couldn't find any related setting in the recording device settings. I'm using Windows 7 64bit, and (I'm mentioning this because the theory has come up that it may be related) I don't have Skype running.

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• Streamline Active Directory account creation via automated web site

  - by SteveM82

  In my company we have high employee turnover, and hence our helpdesk receives about a dozen requests per week for new Active Directory accounts. Currently, we receive these requests simply via e-mail or voice-mail, and rarely do we have all of the information necessary to create the account. I would like to find a web application that can be used by a manager or supervisor to formalize the requests they make for AD accounts for new employees under their command. Ideally, the application would prompt for all of necessary information, and allow the helpdesk to review the requests and approve or deny each one. If approved, the application would take care of creating the account and send an e-mail to the manager. I have found several application on the Internet that handle self-service account management (i.e., password resets or update contact info), which is also nice to have, but nothing that streamlines the new account request and creation part. Can anyone make suggestions on such an application? Thanks.

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• How can I run a job when the server load is low?

  - by jberryman

  I have a command that runs a disk snapshot (on EC2, freezing an XFS disk and running an EBS snapshot command), which is set to run on a regular schedule as a cron job. Ideally I would like to be able to have the command delayed for a period of time if the disk is being used heavily at the moment the task is scheduled to run. I'm afraid that using nice/ionice might not have the proper effect, as I would like the script to run with high priority while it is running (i.e. wait for a good time, then finish fast). Thanks.

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• Fast, reliable data transfers from/to China

  - by Nils

  We are a small company and we will need to transfer rather large amounts of data (10GB+ each time) between Europe and China in the near future. As many may have experienced, Internet connections to or from China can be rather unreliable and slow at times without any apparent reason. For example, while sending data to China via FTP generally works well, it can be painfully slow in the other direction. Currently, we are investigating new ways to have high transfer rates in both directions. So far we have tried: FTP (see above) FTP over VPN services (generally slower than direct connections) F2F (like Retroshare or Freenet - slow!!) Aspera (fast but expensive!) BitTorrent (unreachable end nodes, b/c of firewalls which we must not configure) We would like to try: Cloud storage (e.g. Amazon S3, Google Storage) - are those services always and reliably reachable from inside China? Point-to-Point VPN (currently not possible, b/c of the network, see above) I'd be especially grateful to hear from people who have already dealt with this kind of problem before.

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• What type of amazon instance should I use and do I need auto scaling and load balancing?

  - by Navetz

  Hi I am looking to release a website that will initially have large amounts of uploads from users. The first will be 65GB and the rest will probably be close to 1TB. They could happen simultaneously. My question is what type of amazon server instance would be best for this? The website is just being released so the traffic wont be very high. I have been using a micro instance for development but it is time to launch and I need more power. Should I use auto scaling and a load balancer to increase the number of instances when I need it or Will a small or medium instance do the trick? If I do use auto scaling and load balancing how do I handle things like sessions and the database/file lookups? Does one instance become the primary instance and the rest become clones?

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• Google Chrome passphrase : where is it?

  - by danielson

  Every time I do a fresh install, Google Chrome asks me for my passphrase. Have searched high and low in Google's help forum and have yet to receive or find any form of response. When I do a fresh install, if I try to enter the passphrase (with all possible passwords i can recall) nothing works and I can't recover my extensions, bookmarks etc. On the other hand, if I wait a bit, everything falls to place. I close that window asking for passphrase and all my extensions, bookmarks are back. The failure to enter a proper passphrase code gets me a message to change my passphrase in my account settings. Who knows where that is! No one at Google's forum seems to know anything about this "passphrase".

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• Optimal Disk Setup for OLTP SQL Server

  - by Chris

  We have a high transaction (lots of reads and writes) database server (running SQL 2005) that is currently set up with a RAID 1 OS partition (C:) and a RAID 5 data/log/tempdb partition (D:). The C: has 2 drives and the D: has 4 drives. The server has around 300 databases ranging from 10MB to 2GB in size. I have been reading up on best practices for partioning the disks, but would like some opinions on our setup since we are so limited in the number of disks. It seems like RAID 10 is popular, but I dont think we could use it with only 6 total disks to work with. Thanks. Update I went with 3 RAID 1 Partitions (2 disks each) Partition 1: OS, TempDB, Backups Partition 2: Logs Partition 3: Data

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