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  • Proper management of PGPool II

    - by Cathy
    Currently I have a site, with one Postgres database server. It is just for a select number of users (less than ten) but it needs the maximum uptime possible. I would like some kind of automatic failover for the database. So I was thinking something like: one server running PGPool II, one running Postgres as master, one running Postgres as slave. But then, if wherever PGPool is running suddenly loses power (or dies, or whatever), there's a single point of failure and the whole thing goes down. Is there a solution, assuming that outsourcing this to someone else isn't possible?

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  • Experience with AMCC 3ware 9650se raid cards? Ours seems dead

    - by antiduh
    We have a 8-port 3ware 9650se raid card for our main disk array. We had to bring the server down for a pending power outage, and when we turned the machine back on, the raid card never started. This card has been in service for a couple years without problems, and was working up until the shutdown. Now, when we turn the machine on, the bios option rom that normally kicks in before the bootloader doesn't show up, none of the drives start, and when the OS tries to access the device, it just times out. The firmware on it has been upgraded in the past, so it's possible we've hit some sort of firmware bug. We're using it in a Silicon Mechanics R272 machine with gentoo for the OS. The OS eventually boots, but alas, without the card. We've ordered a new one, but I'm worried that if we replace the card it won't recognize the existing array. Has anybody performed a card swap before? Any help would be greatly appreciated.

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  • Grails - Self Join

    - by WaZ
    Hi, When I write the following class, I get the following compilation error: could not resolve property How can I achive the following: class Employee{ String Name String Email Employee Manager static hasMany = [desginations:Designation] static constraints = { Name(unique:true) Email(unique:true) } Thanks, Much appreciated.

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  • Problem with xvideoservice thief

    - by Nrew
    Xvideo service thief is an application that allows you to download and convert youtube videos into .avi format. The problem is when it tries to convert the .flv into a .avi. The audio in the video is not being played when you try to play the video. But the .flv works fine. I have also enabled Intel(R) speedstep feature in my processor(Pentium Dual core E5200) to decrease the power consumed by the processor with the help of Granola software. What might be the reason for the audio less video converter by xvideo service thief? Could it be the enabling of intel(R) speedstep? Because the software works fine when its not enabled. Is this possible?That the output some applications can be altered when enabling this processor feature?

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  • Slight network lag on Small Business Server 2008 R2

    - by Sir.Nathan Stassen
    I recently upgraded a network from a SBS 2003 server to a SBS 2008 R2 Server. Both I and users have noticed a slight delay in network applications and browsing network drives on the new server. It is minor, maybe a second or two at most. However I am wondering if anyone knows of anyway to optimize the networking to service requests sooner to the workstations. The network is running a 1 gig network with some 100 meg devices (mainly network printers). All workstations are XP SP3 Network software runs out of a shared folder mapped as a network drive, no sql databases. Server is a Dell Poweredge T610 with plenty of ram, cpu power, and storage.

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  • Reloading of persisted entity

    - by Udi
    I'm using OpenJPA in my application as a JPA vendor. The question is theoretical or conceptual: Is there any way to tell an entity manager to load an entity from the DB rather than from it's cache? The problematic scenario: EM1.persist(Entity1) EM2.merge(Entity1) EM1.find(Entity1) <--- Entity1 is the cached version rather than the merged one.. Any elegant way to do it? I really don't want to call em.refresh(entity).

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  • Fiddler - Daily stop start

    - by weismat
    What is the best way to stop/start Fiddler as a daily task? I am usin Fiddler to monitor/logs https trafficon machine which runs fully automated and runs software which is not controlled by me, but uses https. My machine stopped yesterday because Fiddler went out of memory after running over 3 days and now I want to have a clean way to start/stop it. I guess I could just specify a process duration in the task manager, but I would prefer something cleaner, especially to avoid issues when things are started manually.

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  • My External USB drive stops after reading some data

    - by user191542
    I had the external USB 3.0 western Digital My Book essential 3TB drive. I had loto of data on it. Suddenlt when i start copying data from it then after reading 20GB or so data then i get error that system can't read from the location. I have to turn the uSB power off , disconnect it and then again connect it. so i have to trnasfer the data in small chunks like 20Gb , 30GB etc. I have n ow transferred all the data but i want to know that is hard disk gone or it can be fixed or its something windows fault not HD fault

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  • Most efficient way to use a laptop like a desktop? [closed]

    - by user74757
    When I'm at home (which is the vast majority of the time now in Summer), I rarely use my laptop away from my desk. When it is at the desk, I plug in a monitor through HDMI, a power cable, and a mouse and keyboard that always stay there. I was wondering if anyone had any recommendations as to a good dock or product that does a good job of transforming a laptop into a true "desktop replacement." Ideally, it would allow all the connections to remain in place, with minimal effort to take the laptop in and out of the fixture. Thanks for any suggestions!

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  • Node.js server crashes , Database operations halfway?

    - by Ranadeep
    I have a node.js app with mongodb backend going to production in a week and i have few doubts on how to handle app crashes and restart . Say i have a simple route /followUser in which i have 2 database operations /followUser ----->Update User1 Document.followers = User2 ----->Update User2 Document.followers = User1 ----->Some other mongodb(via mongoose)operation What happens if there is a server crash(due to power failure or maybe the remote mongodb server is down ) like this scenario : ----->Update User1 Document.followers = User2 SERVER CRASHED , FOREVER RESTARTS NODE What happens to these operations below ? The system is now in inconsistent state and i may have error everytime i ask for User2 followers ----->Update User2 Document.followers = User1 ----->Some other mongodb(via mongoose)operation Also please recommend good logging and restart/monitor modules for apps running in linux

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  • Using 2-port LSI 2308-8e card to control 24 SAS HDDs

    - by GregC
    I would like to rely on a RAID-on-chip solution to control 24 SAS hard drives in a direct-attached environment. How would you approach this to get best bandwidth given that I'd like to spend less than $10,000 on the interconnect. I've read that LSI 2308 chip can easily handle 8-drive SSD RAID6 in hardware. I'd like to harness its power to control 24 SAS hard drives over an expander in an external enclosure. Currently I use an Infortrend S24S-G2240 external enclosure. It provides its own controller and expander. I'd like to use LSI 2308 controller for RAID6 somehow instead of the mystery controller in the enclosure. P.S. I tried to create SAS-expander as a tag, but my rep on this site is low.

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  • TrueCrypt Failing to Decrypt External Hard Drive after changing Enclosures

    - by Anx Ara
    I have a 4TB external hard drive that was previously encrypted using TrueCrypt. The power source on the hard drive enclosure failed, so I had to switch the hard drive itself into a new enclosure. I can no longer decrypt the hard drive using TrueCrypt, as it says my password is wrong. I am certain that I entering the correct password. Additionally, in TrueCrypt, when I try to mount the volume under "Select Device", it shows the following: Harddisk 5: 3.6TB Device\Harddisk5\Partition 1 H: 465GB Whereas before I changed the enclosure it would show: Harddisk 5: 3.6TB Device\Harddisk5\Partition 1 H: 3.6TB I am on a Windows 8 PC and using TrueCrypt 7.1a. How can I get it to decrypt properly?

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  • Odd Tools and Techniques for System Administrators

    - by Joseph Kern
    There's been a lot of questions centering on Software Tools for System Administrators. But I would like to know about any odd physical tools or techniques that you've used; Something that you never expected to be useful, but ended up saving the day. I'll go first: A Camera Phone. An application server had a major power issue that borked the RAID. Many of the disks were offline. Before I took the plunge and forced disks back online, I took a picture of the RAID BIOS screen with my camera phone. Having the exact layout of the RAID stored safely in my pocket, I was able to reset the RAID, and reboot the server. What odd tools/techniques have you used?

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  • Experienced developer trying to get outsourcing contract with current client.

    - by Mike
    I work for a major bank as a contract software developer. I've been there a few months, and without exception this place has the worst software practices I've ever seen. The software my team makes has no formal testing, terrible code (not reusable, hard to read, etc), minimal documentation, no defined development process and an absolutely sickening amount of waste due to bureaucratic overhead. Part of my contract is to maintain a group of thousands of very poorly written batch jobs. When one of the jobs fails (read: crashes), it's a developers job to look at the source, figure out what's wrong, fix it, and check it in. There is no quality assurance process or auditing of the results whatsoever. Once the developer says "it works" a manager signs off and it goes into production. What's disturbing is that these jobs essentially grab market data and put it into a third-party risk management system, which provides the bank with critical intelligence. I've discovered the disturbing truth that this has been happening since the 90s and nobody really has evidence the system is getting the correct data! Without going into details, an issue arose on Friday that was so horrible I actually stormed out of the place. I was ready to quit, but I decided to just get out to calm my nerves and possibly go back Monday. I've been reflecting today on how to handle this. I have realized that, in probably less than 6 months, I could (with 2 other developers) remake a large component of this system. The new system would provide them with, as primary benefits, a maintainable codebase less prone to error and a solid QA framework. To do it properly I would have to be outside the bank, the internal bureaucracy is just too much. And moreover, I think a bank is fundamentally not a place that can make good software. This is my plan. Write a report explaining in depth all the problems with their current system Explain why their software practices fail and generate a tremendous amount of error and waste. Use this as the basis for claiming the project must be developed externally. Write a high level development plan, including what resources I will require Hand 1,2,3 to my manager, hopefully he passes it up the chain. Worst case he fires me, but this isn't so bad. Convinced Executive decides to award my company a contract for the new system I have 8 years experience as a software contractor and have delivered my share of successful software products, but all working in-house for small/medium sized companies. When I read this over, I think I have a dynamite plan. But since this is the first time doing something this bold so I have my doubts. My question is, is this a good idea? If you think not, please spare no detail.

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  • Joomla - Contact form error

    - by Steph
    Hi, I have a working contact form in Joomla however when the user submits the form they are taken to a page that doesn't exist so they see the 404 error. Is it possible to change the page they are taken to after they click submit? It's a contact page made from a contact in the Contact Manager... Thanks a lot, Steph

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  • write-through RAM disk, or massive caching of file system?

    - by Will
    I have a program that is very heavily hitting the file system, reading and writing randomly to a set of working files. The files total several gigabytes in size, but I can spare the RAM to keep them all mostly in memory. The machines this program runs on are typically Ubuntu Linux boxes. Is there a way to configure the file system to have a very very large cache, and even to cache writes so they hit the disk later? I understand the issues with power loss or such, and am prepared to accept that. Crashing aside, in normal operation the writes should eventually reach the disk! Or is there a way to create a RAM disk that writes-through to real disk?

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  • Updating a deallocated UIWebView from a background thread

    - by Dan Ray
    As you can see from the title, I've programmed myself into a corner and I've got several things working against me... In a UIViewController subclass that manages a large and complex view. One part of it is a UIWebView that contains output from a web request that I had to build and execute, and manually assemble HTML from. Since it takes a second or two to run, I dropped it into the background by calling self performSelectorInBackground:. Then from that method I call there, I use self performSelectorOnMainThread: to get back to the surface of the thread stack to update the UIWebView with what I just got. Like this (which I've cut down to show only the relevant issues): -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { //then get mapquest directions NSLog(@"Got called to handle new location!"); [manager stopUpdatingLocation]; [self performSelectorInBackground:@selector(getDirectionsFromHere:) withObject:newLocation]; } - (void)getDirectionsFromHere:(CLLocation *)newLocation { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; CLLocationCoordinate2D here = newLocation.coordinate; // assemble a call to the MapQuest directions API in NSString *dirURL // ...cut for brevity NSLog(@"Query is %@", dirURL); NSString *response = [NSString stringWithContentsOfURL:[NSURL URLWithString:dirURL] encoding:NSUTF8StringEncoding error:NULL]; NSMutableString *directionsOutput = [[NSMutableString alloc] init]; // assemble response into an HTML table in NSString *directionsOutput // ...cut for brevity [self performSelectorOnMainThread:@selector(updateDirectionsWithHtml:) withObject:directionsOutput waitUntilDone:NO]; [directionsOutput release]; [pool drain]; [pool release]; } - (void)updateDirectionsWithHtml:(NSString *)directionsOutput { [self.directionsWebView loadHTMLString:directionsOutput baseURL:nil]; } This all works totally great, UNLESS I've backed out of this view controller before CLLocationManager hits its delegate method. If this happens after I've already left this view, I get: 2010-06-07 16:38:08.508 EverWondr[180:760b] bool _WebTryThreadLock(bool), 0x1b6830: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now... Despite what this says, I can repeatably cause this crash when I back out too early. I'm not at all convinced that attempting a UI update from a background thread is really the issue; I think it's that my UIWebView is deallocated. I suspect that the fact I was just IN a background thread makes the runtime suspect something's up about that, but I feel fairly sure that's not it. So how do I tell CLLocationManager not to worry about it, when I'm backing out of that view? I tried [self.locationManager stopUpdatingLocation] inside my viewWillDisappear method, but that didn't do it. (Incidentally, MapQuest's apis are FANTASTIC. Way WAY better than anything Google provides. I can't recommend them highly enough.)

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  • Replacing notebook SATA hard disk with SSD without reinstalling

    - by Graeme Donaldson
    So there's a notebook (Lenovo Thinkpad Z61m) with a SATA hard disk, the SATA controller is configured for native AHCI operation & the OS is Windows XP. The hard disk is going to be replaced with an SSD which is larger. I have an idea of how I'm going to do this, but I want to be sure there isn't something obvious I'm missing. Connect external USB drive Boot some flavour of Linux live CD Use dd to clone the SATA disk to the external drive Power off and replace the SATA disk with the SSD Boot the live CD Use dd to clone back from the external drive to the SSD Does anyone have anything to add?

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  • How to Configure SSL over Database in Spring?

    - by Sameer Malhotra
    Hi, I want to add SSL security in the Database layer. I am using Struts2.1.6, Spring 2.5, JBOSS 5.0 and Informix 11.5. Any idea how to do this? I have researched through a lot on the internet but could not find any solution. Please suggest! Here is my datasource and entity manager beans which is working perfect without SSL: <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <property name="database" value="INFORMIX" /> <property name="showSql" value="true" /> </bean> </property> </bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="com.informix.jdbc.IfxDriver" /> <property name="url" value="jdbc:informix-sqli://SERVER_NAME:9088/DB_NAME:INFORMIXSERVER=SERVER_NAME;DELIMIDENT=y;" /> <property name="username" value="username" /> <property name="password" value="password" /> <property name="minIdle" value="2" /> </bean> <bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean" lazy-init="false"> <property name="targetObject" ref="dataSource" /> <property name="targetMethod" value="addConnectionProperty" /> <property name="arguments"> <list> <value>characterEncoding</value> <value>UTF-8</value> </list> </property> </bean> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" scope="prototype"> <property name="dataSource" ref="dataSource" /> </bean> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <tx:annotation-driven transaction-manager="transactionManager" />

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  • What does the "Maximum Frequency" number mean in the Windows Resource Monitor?

    - by nhinkle
    In the Windows Resource Monitor's CPU tab, there is a status box and graph for the "Maximum Frequency", right next to the "CPU Usage" values. What does this mean? The value is sometimes over 100% on my system... what could that imply? By looking at CPU-z's real-time report of the processor's clock speed, it seems to be loosely related to what frequency the CPU is running at, which would imply that it means "percent of maximum possible frequency the CPU is running at"; this would be of relevance on systems with SpeedStep and/or TurboBoost technology (or similar). Furthermore, setting the system to "power saving mode" lowers the "maximum frequency" value to around 60%, while setting it to "high performance" mode sets it to around 110%. However, the percentage does not seem to exactly correlate to the CPU speed being shown. What value is this actually representing then?

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  • USB ports not recognizing devices (vista)

    - by frank
    I'm trying to fix a problem on a Vista machine where all the USB ports seem to have power but they don't recognize devices plugged into them. It seemed to start after I plugged my mp3 player (sansa clip) into it and disconnect it. So it sounds similar to this article http://support.microsoft.com/kb/817900 but that was for XP. And I did try all the fixes (including the registry entry) but they did not help. It also sounds similar to this SU question 50110 but I don't think it is the mother board. I have see other places that suggest reinstalling the OS...but that seems like a last resort type of thing. I have also seen a suggestion of doing a system restore but not sure if that will help. Any ideas of what I can try?

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  • Looking a lightweight PHP ORM

    - by allenskd
    At first I was going to use doctrine ORM as the main one but it was an overkill, unneeded features and probably excessive calls. One of the main reasons was the "helper" that handled traverse trees (the hierarchy tree) easily but I'm starting to prefer building my own class. This is what I'm looking for: 1) Can manage multiple database connections, (sort of like doctrine manager) 2) Models 3) flexible All suggestions are welcome

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