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  • How long do managed gigabit ethernet switches take to boot up?

    - by Warren P
    One critical drawback that I have found in researching managed-switches, and one that I have some past experience with is that anything with "lots" of firmware is going to have lots of issues associated with that firmware. We are in the middle of researching rackmount gigabit switches (48 port). It looks like for 48 ports, our only choice is managed switches (Dell, Cisco/Linksys,HP, etc). What I want to know, that I can not find out much about is the boot-time for various managed switches. If you own one, can you please answer with the model number, and the cold boot time in seconds. I have read online that Linksys (now Cisco) SRW series sometimes take almost 5 minutes before they are fully booted up, and that is an unacceptable cost for us. I particularly want to know about Dell PowerConnect managed switch bootup time (model 3548 and 5448), and would like to confirm the 5-minute boot time on the SRW2048 or similar model, and any HP ProCurve boot up times. The composite of all those figures ought to form an interesting overall performance picture.

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  • Correct way to make datasources/resources a deploy-time setting

    - by Draemon
    I have a web-app that requires two settings: A JDBC datasource A string token I desperately want to be able to deploy one .war to various different containers (jetty,tomcat,gf3 minimum) and configure these settings at application level within the container. My code does this: InitialContext ctx = new InitialContext(); Context envCtx = (javax.naming.Context) ctx.lookup("java:comp/env"); token = (String)envCtx.lookup("token"); ds = (DataSource)envCtx.lookup("jdbc/datasource") Let's assume I've used the glassfish management interface to create two jdbc resources: jdbc/test-datasource and jdbc/live-datasource which connect to different copies of the same schema, on different servers, different credentials etc. Say I want to deploy this to glassfish with and point it at the test datasource, I might have this in my sun-web.xml: ... <resource-ref> <res-ref-name>jdbc/datasource</res-ref-name> <jndi-name>jdbc/test-datasource</jndi-name> </resource-ref> ... but sun-web.xml goes inside my war, right? surely there must be a way to do this through the management interface Am I even trying to do the right thing? Do other containers make this any easier? I'd be particularly interested in how jetty 7 handles this since I use it for development. EDIT Tomcat has a reasonable way to do this: Create $TOMCAT_HOME/conf/Catalina/localhost/webapp.xml with: <?xml version="1.0" encoding="UTF-8"?> <Context antiResourceLocking="false" privileged="true"> <!-- String resource --> <Environment name="token" value="value of token" type="java.lang.String" override="false" /> <!-- Linking to a global resource --> <ResourceLink name="jdbc/datasource1" global="jdbc/test" type="javax.sql.DataSource" /> <!-- Derby --> <Resource name="jdbc/datasource2" type="javax.sql.DataSource" auth="Container" driverClassName="org.apache.derby.jdbc.EmbeddedDataSource" url="jdbc:derby:test;create=true" /> <!-- H2 --> <Resource name="jdbc/datasource3" type="javax.sql.DataSource" auth="Container" driverClassName="org.h2.jdbcx.JdbcDataSource" url="jdbc:h2:~/test" username="sa" password="" /> </Context> Note that override="false" means the opposite. It means that this setting can't be overriden by web.xml. I like this approach because the file is part of the container configuration not the war, but it's not part of the global configuration; it's webapp specific. I guess I expect a bit more from glassfish since it is supposed to have a full web admin interface, but I would be happy enough with something equivalent to the above.

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  • Should I invest time in learning about OR\M or LINQ?

    - by Peter Smith
    I'm a .NET web developer primarily who occasionally writes console applications to mine data, cleanup tasks, etc. Most of what I do winds up involving a database which I currently design via sql server management studio, using stored procedures, and query analyzer. I also create a lot of web services which are consumed via AJAX applications. Do these technologies really help you in speeding up development times? Do you still have to build the database or object code first?

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  • Upload Excel or CSV file to MySQL with PHP

    - by Tony
    I'm looking to allow users to upload an Excel or CSV file to MySQL for a contact management system. Need to be able to allow users to map their columns so that they are imported into the correct column in the table. Anyone know of a good site or tutorial on this?

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  • Home server - HP Proliant Microserver - Software and setup - OS on USB stick? [closed]

    - by Lloyd Watkin
    I've just purchased a HP ProLiant Microserver for home use. I want to set up with web server, samba shares, the usual stuff. My question is really about system setup. It has an internal USB socket so I've attempted to install a copy of Fedora 14 onto it. I turned off X/Gnome, but it still ran like a pig. I've now put the OS on one of the internal disks (250Gb, 7200rpm), but I was wondering if there was a way to utilise the internal USB to give me better power-saving allowing the hard drives to be shut down when not in use. How would you set this server up? I'd rather not go to the extra cost of an SSD right now, but if that's the best way then so be it.

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  • Disable TSQL script check?

    - by grady
    Hi, lets say I have a script like that: if(some condition) begin select somecolumn from sometable end Lets say, that "somecolumn" does not exist and the condition is not true, which means the select is NOT executed. Even though the select would not be executed, the script is not valid, Management Studio complains about the missing column "somecolumn". Question: Can I somehow disable this sort of check so that the script is executed and since the if is not true, it will never notice that the column is missing? Thanks :-)

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  • sql 2008 express connection problems

    - by user163457
    Hi, I've just installed a fresh copy of SQL 2008 Express. before I did anything I opened Management Studio and successfully connected using Window Authentication. However I tried to run the following on the command line "telnet localhost 1433" and got the error "Could not open connection to the host, on port 1433: Connect failed" I checked netstat and there is nothing listening on port 1433. Before I go any further, is there a problem with the install? thanks, Shane

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  • logins with cURL

    - by steve
    I'm looking to use cURL to login to Blackboard, a course management system used a many universities. (For example, http://blackboard.unh.edu) How would I do this? Blackboard uses HTTPS certificates and cookies too I believe. Thanks!

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  • Software Architecture: Unit of Work design pattern discussion

    - by santiagobasulto
    Hey everybody. According Martin Fowler's Unit of Work description: "Maintains a list of objects that are affected by a business transaction and coordinates the writing out of changes and resolution of concurrency problems." Avoiding very small calls to the database, which ends up being very slow I'm wondering. If we just delimit it to database transaction management, won't prepare statements help with this?

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  • automating sql express backup via VSS backup

    - by Ornus
    I need to set up on my server automated daily SQL db backups (sql express, so no maintenance plans). To keep things simple I'm gonna use a backup solution (JungleDisk) that uses VSS to back up the DB file. SQL fully supports VSS and on requests freezes DB I/O, so I understand I'm taking snapshots. JungleDisk supports doing differential back up and compression, so it simplifies things and keeps the cost/bandwidth down. Is it enough to just backup up db file (mdf). Do I need to back up transaction log (ldf) file as well? I'm ok with losing a day's worth of work (since the last backup). if I go this route, what's the best way to restore the database? are there any issues with this approach I'm not aware of?

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  • Running a home mail server using dynamic dns [closed]

    - by Anand
    Hi, Is it possible to run an email server on my home box using dynamic dns? The scenario is, I want to auto cc all incoming and outgoing emails from my one account to another, from some server side config instead of configuring email clients for rules. I have tried Google Apps Mail but it doesn't allow auto cc of outgoing emails. After having read tons of blogs, forum messages etc (hope I have been reading the correct info :) ) the only option to achieve what I am needing is to setup my own mail server, but the cost of getting a static IP doesn't fit my budget. Please can someone point me in the correct direction. Platform doesn't matter, I can setup a Windows or Linux server. Many Thanks

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  • DNS failover across multiple datacenters?

    - by Jae Lee
    I've got a site that is starting to get a lot of traffic and just the other day, we had a network outage at the datacenter where our loadbalancer (haproxy) is hosted at. This worried me as despite all my efforts of making the system fully redundant, I still could not make our DNS redundant, which I think isn't an easy solution. Only thing I was able to find was to sign up for DNS failover from places like dnsme, etc .... but they cost too much for budding startups. Even their Corporate plan only gives you 50 million queries per month and we use that up in a week. So my question is, are there any self hosted DNS we can do that provides the failover like how dnsme does it?

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  • Virtual Machine files on ramdisk doesn't run faster than on physical disk

    - by Landy
    I installed total 36G memory (4x8G + 2x2G) in the host (Windows 7) and I used ImDisk to create a 32G ramdisk and format it to NTFS file system. Then I copied the virtual machine (in VMware Workstation format) folder, including vmx, vmdk, etc... to the new created ram disk. Then I tried to power on it in VMware Workstation. What made me surprised is that the performance is not better than before. It cost almost the same time to power on the Windows 7 VM. I check the Resource Monitor in the Windows 7 host, and the statistics of CPU, disk, network are rather normal. The memory has reported 3000+ hard fault/sec when guest OS boot then drop to 0 after the guest powered on. Any idea about this issue? I had thought the performance of ramdisk will be better than physical disk in this case. Am I wrong? Thanks.

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  • What features would you like to see removed from C++?

    - by Justin Ethier
    This question was inspired by what-features-would-you-like-to-see-added-to-c. anBasically, C++ is a great general-purpose language. But perhaps too general and feature-rich... multiple inheritance, operator overloading, manual memory management, templates, smart pointers, virtual destructors, legacy frameworks (think MFC), and I could just go on. Is there any one feature / aspect of C++ that you would like taken away, to make our lives easier as C++ developers? One feature per answer, please.

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  • CentOS Vs Windows Server 2008

    - by Steve
    Hi, Apologies if the question appears ambiguous, I have little experience in this area and was after some informed opinions. I am deploying a test scenario of a server/client network and need to make some choices for Server. The client will be a Windows system as it meets the requirements for the client, the server choice has more room for selection. From my experience with Linux in general and the appealing nature of open source for low cost, security etc and the availability and performance of database and web server programs I have been considering CentOS as a server choice. I have the ability to make most of the choices of what software / server packages I wish to install. This includes Active Directory (something I have no experience with). How well does this operate with Windows clients? Am I being too selective and creating unnecessary complication by setting out not to use a Windows Server OS?

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  • In general, do 3rd-party laptop AC adapters / chargers work reliably?

    - by MGOwen
    The AC adapters for my 2 dell laptops wore out very quickly. One supplies power but won't charge the battery (it's about 3 years old, the other is a bit newer). Both have worn through to the shielding around the notebook connector and look like they'll be unusable soon. Checking user reviews of the replacement adapter on Dell's own website, it appears they usually fail this fast. Apparently Dell does this deliberately to make money (their adapters sell for about 10-15 times what they cost to make). Same with replacement batteries. I can see there are plenty of much cheaper ($50 less) compatible AC adapters on eBay. Does anyone have experience with these? Naturally I'm nervous a crappy knock-off could fry my notebook, but has this ever actually happened to anyone recently? Has anyone had a good experience? Can anyone recommend a good online seller (who doesn't charge nonsensical shipping costs to Australia, preferably?)

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  • IPhone memory problems...

    - by jAmi
    Hi, I am working on an App that is already been made but Memory Management was not considered in the development stages. So what can I do to keep the App memory usage low as soon as I get a memory warning? Is there any general tool or some piece of code that I can use to release any unused memory?

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  • LotusNotes as a datasource for a .net C# site

    - by AlexFreitas
    Is it possible to have a connection to LotusNotes and use it as a data source for a C# project? We use LN for email/calendar :(... and management wants a web page that would interact with the calendar. I think this can all be done within Notes, but I would much rather do it in .net. They also want some very specific functionality, some of which I'm not really sure can even be done in Notes. Cheers, -Alex

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  • Is django orm & templates thread safe?

    - by Piotr Czapla
    I'm using django orm and templates to create a background service that is ran as management command. Do you know if django is thread safe? I'd like to use threads to speed up processing. The processing is blocked by I/O not CPU so I don't care about performance hit caused by GIL.

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  • Should I split my website into different servers

    - by Nyxynyx
    I have a website where a user uploads photos, the photos gets resized and thumbnailed, and stored on the server. At the same time, there are some INSERTS into a MySQL table regarding the photo uploaded (like description, user id etc). The site currently runs off a managed VPS, and I love the support it provides. However it is expensive to store the many small photos and the resizing and thumbnailing processes do cause spikes on the app performance. (Amazon S3 is pretty expensive, especially considering the costs for uploading many small files) Question: Will it be a good idea to move the image processing operations and image storage to another server which is an unmanaged dedicated server with a much lower cost/gb and keep the current VPS for its 24/7 support and hosting the webapp? Or should I move the entire site to the dedicated server? VPS Specs 16 cores 2.4GHz (E5620) 1GB memory 60GB Storage 3.5TB transfer $43/mth Managed (24/7) Dedicated Specs i3 2130 2 cores 3.4+ GHz 16 GB DDR3 2 x 1TB SATA2 storage 15 TB transfer $79/mth Unmanaged (Weekdays support) Software used Apache PHP MySQL Solr PostgreSQL ImageMagick

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  • How long to erase flash memory (RAID controller)?

    - by Rob Nicholson
    I made a bit of a boo boo last night in upgrading the BIOS in a Silicon Image Sil3132 eSATA adapter. It's a RAID controller in a server. I accidently flashed it with the wrong BIOS ;-) Not the end of the world as this card only cost £15 but I'm trying to flash it with the correct BIOS as it won't obviously work anymore. Silicon Image supply a DOS program for flashing and I thought I'd use the Erase function to get rid of the old BIOS. Any idea how long this should take? It's been sat at the "Erasing memory" prompt for about 15 minutes. Thanks, Rob.

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