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Can you point me to a nontrivial strategy pattern implementation?

- by Eugen Martynov

We are faced implementing a registration workflow with many branches. There are three main flows which in some conditions lead to one another. Each flow has at least four different steps; some steps interact with the server, and every step adds more information to the state. Also the requirement is to have it persistent between sessions, so if the user closes the app (this is a mobile app), it will restore the process from the last completed step with the state from the previous session. I think this could benefit from the use of the strategy pattern, but I've never had to implement it for such a complex case. Does anyone know of any examples in open source or articles from which I could find inspiration? Preferably the examples would be from a live/working/stable application. I'm interested in Java implementation mostly; we are developing for Java mobile phones: android, blackberry and J2ME. We have an SDK which is quite well separated from platform specific implementations, but examples in C++, C#, Objective-C or Python would be acceptable.

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How can I discourage the use of Access?

- by Greg Buehler

Lets pretend that a very large company (revenue numbers with more than 8 figures) is looking to do a refresh on a software system, particularly the dashboard used by employees. This system was originally put together in the early 1990's to handle inventory tracking and storage across a variety of facilities (10+). Since this large company is now in the process of implementing some of these inventory processes with SAP they are in need of a major refresh. The existing system: Microsoft Access project performs dashboard duties Unique shipping/receiving configurations at different facilities require unique forms and queries within the Access project Uses 3rd party libraries referenced by Access to directly interface with at control system (read: motors, conveyors, and counters) Individual SQL Server 2000 instances (some traces of pre-update SQL Server 6.0 documents) at each facility The Issue: This system started as a home brewed inventory tracking scheme with a single internal sponsor who is still in charge of the technical direction. The original sponsor prescribing the desired deliverables that are being called for in the current RFP. The RFP describes a system based around a single Access project. Any suggestion that Access is ill suited for a project of this scope are shot down under the reasoning that "it works for the scope now". Are there any case studies, notices, or statements that can be used to disuade this potential customer from repeating their mistake? Does Microsoft make any statements directly about when it is highly recommended to ditch Access?

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Cannot terminate proces: access is denied

- by jao

Skype and Spotify remain active after I close them. When I try to close them via Task Manager Details End Task, I get the following error: The operation could not be completed. Access is denied. So I have to reboot to get rid of these programs or to log in to Skype again. Also, running a CMD as administrator and executing taskkill /f /im skype.exe results in an Access is denied error. What is going on? (this is Windows 8 RTM x64) update I have to kill skype.exe because it crashed and when I restart skype, I get the following error: It says: Could not open Skype, you are already signed in on this computer. update 2 The process is owned by my own username.

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Prevent Windows 7 prompt format USB HDD

- by mike

I am running Windows 7. I have a USB HDD 100% formatted with a Trucypt partition. When I insert the drive into my system, Windows asks if I would like to format the drive, each time I insert the drive. So how do I turn this prompt off? If so, I would prefer it be applied globally (e.g. no more prompts for any other drives). Since its an invisible partition unless mounted with Trucypt, Windows is always going to think nothing is there and continue to prompt me. I don't want to hit enter on the keyboard a few times by mistake doing something else and have it to go through the process. I'll lose everything. It is all backed up BTW. Will just be inconvienient.

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Taking ownership of trustedinstaller files?

- by P a u l

vista32-sp1: I am unable to delete some files on my system that were installed with 'special permissions' by 'trustedinstaller'. I find the usual help suggestion to use 'takeown' is not working, all I get is access denied. I refuse to believe there isn't some way to delete these files, or that microsoft has finally acheived their perfect security filesystem. This is NOT a case of a file being locked by a process. If this is all it was, I could solve this by myself. I know there are some recommended unlocking programs and they might do some sort of file system trick, but I would like to know what my possible direct actions might be. If a 3rd party program can 'unlock' a file, I want to know the mechanism. But like I said 'takeown' at the command line is not working for this.

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MOSC Bits - Personalized Profile

- by Irina Donaldson - Moderator -Oracle

It is a good idea to have a unique profile in MOSC. Your activities there are better recognized and might even become a well known brand! This leads to recognition and trust. My Oracle Support Communities (MOSC) is a well established platform where experiences are shared. Reputation and trust are the basis for the quality of all communication there. A personalized profile can help to build up a good reputation. Besides the experience counter, a good name, details about your location and business experience are valuable details. Although a little bit hidden, the profile's avatar can be customized, too. The profile's avatar is an eye catcher and can act as an unique visual representation for you. How to add / modify MOSC profile avatar (picture, icon) ? Don't look in Edit Profile section. After login, click on your profile's name on top right. This lists all public information as part of the Bio section. Select the Activity tab. The Change Avatar link is on same level at far right. A list of predefined symbolic pictures is populated. Choose from the list of existing pictures or try Add Another to upload an image file from your local computer (JPG, PNG, GIF, or BMP only, maximum file size of 2.0 MB). Note: New added images can be used only after running through a review process. Usually after one business day they can be selected for your personal avatar.

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What's the fastest and automatic way to transfer 2GB of data between 2 PCs every night?

- by phan

While it's fast (less than 2 minutes) I hate having to copy files from PC #1 onto a USB stick, and then manually popping it in PC #2 to copy the files to PC #2. Dropbox is too slow in uploading and then downloading 2GBs (synching), it could take hours. Copying 2GBs over the network is also slow because we're dealing with 10,000 little files that totals 2GBs, and not just one, giant 2gb file. Not sure why, but dealing with 10,000 little files makes the copy process much longer. Is there any other method that I'm missing? Any ideas? I'm using Win7 on both PCs. Edit: These files change every single night.

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browser without gpu support

- by manuzhang

Google has an Easter egg that draws 3D graph but when I tried it out on chrome it complained about no WebGL support. I've also tested it on Firefox whose WebGL support was enabled but ended up with the same problem. Thus, I suspect it's an issue of my GPU. Some googling led me to chrome://gpu and here's what I got Graphics Feature Status Canvas: Software only, hardware acceleration unavailable HTML Rendering: Software only, hardware acceleration unavailable 3D CSS: Unavailable. Hardware acceleration unavailable WebGL: Unavailable. Hardware acceleration unavailable WebGL multisampling: Unavailable. Hardware acceleration unavailable Problems Detected GPU process was unable to boot. Access to GPU disallowed. GL driver is software rendered. Accelerated compositing is disabled.: 59302 Mesa drivers in linux older than 7.11 are assumed to be buggy. Accelerated 2d canvas is unstable in Linux at the moment. Version Information Data exported Tue Apr 10 2012 18:35:57 GMT+0800 (CST) Chrome version 18.0.1025.151 (Official Build 130497) Operating system Linux 3.0.0-0300-generic Software rendering list version 1.27 ANGLE revision 988 2D graphics backend Skia I wonder what each of the problem implies and How I may properly deal with it? I'm using Ubuntu 11.04

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Post-compromise security scan; anything else?

- by IVR Avenger

Hi, all. My girlfriend checked her Gmail yesterday morning, and then found, later on in the day, that it would no longer accept her password. She also found that this happened to her Hotmail and Yahoo! accounts. She's only checked these accounts from her work and home PC, and I've spent the day checking the home PC for problems. A full AVG scan revealed a couple of installers for her webcam software that had questionable security signatures, and a full Windows Defender scan brought back nothing. Assuming that her home PC was compromised, somehow, is there anything else I should use to check it for some sort of lingering malicious app before I tell her it's okay to login to her accounts, again? Furthermore, she's going through the GMail "account recovery" process as the account appears to have been disabled. Does anyone know if this actually works? Thanks so much. IVR Avenger

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NginX & PHP-FPM, random 502.

- by pestaa

2010/09/19 14:52:07 [error] 1419#0: *10220 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: [...], server: [...], request: "POST /[...] HTTP/1.1", upstream: "fastcgi://unix:/server/php-fpm.sock:", host: "[...]", referrer: "[...]" This is the error I'm receiving randomly. 95% of the time my setup works perfectly, but once in a while I'm getting 502 for 3-4 subsequent requests. I'm using Unix socket between the server and the PHP process as you can see, also have set up FastCGI params (SCRIPT_FILENAME), etc. correctly. What can I do about it to strengthen the connection between these services? Thank you very much in advance.

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Brocken package for libavcodec54 & libx264-123 in ubuntu 14.04LTS

- by Kachavarapu Ajay

$ sudo apt-get install -f [sudo] password for ajay: Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: libx264-123 The following NEW packages will be installed: libx264-123 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. 2 not fully installed or removed. Need to get 0 B/345 kB of archives. After this operation, 1,005 kB of additional disk space will be used. Do you want to continue? [Y/n] y (Reading database ... 166965 files and directories currently installed.) Preparing to unpack .../libx264-123_0.123.2189+git35cf912-1ubuntu4_amd64.deb ... Unpacking libx264-123:amd64 (2:0.123.2189+git35cf912-1ubuntu4) ... dpkg-deb (subprocess): decompressing archive member: lzma error: compressed data is corrupt dpkg-deb: error: subprocess <decompress> returned error exit status 2 dpkg: error processing archive /var/cache/apt/archives/libx264-123_0.123.2189+git35cf912-1ubuntu4_amd64.deb (--unpack): cannot copy extracted data for './usr/lib/x86_64-linux-gnu/libx264.so.123' to '/usr/lib/x86_64-linux-gnu/libx264.so.123.dpkg-new': unexpected end of file or stream Errors were encountered while processing: /var/cache/apt/archives/libx264-123_0.123.2189+git35cf912-1ubuntu4_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1)

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ArchBeat Link-o-Rama for November 27, 2012

- by Bob Rhubart

Eventing Hello World | Ronald van Luttikhuizen Oracle ACE Director Ronald van Luttikhuizen shares the slides, source code, and other information from his recent presentation at the DOAG conference in Nürnberg. How to Create Virtual Directory in Weblogic Server | Zeeshan Baig Oracle ACE Zeeshan Baig shows you how in six easy steps. ADF Mobile - Secured Web Service Access | Andrejus Baranovskis "There are good tutorials how to consume open Web Service in ADF Mobile," says Oracle ACE Director Andrejus Baranovskis, "but in practice almost every Web Service exposed for the mobile must be secured - who wants to expose open Web Service on the public internet?" His blog post will set you on the right course. How-to: Starting with Oracle Service Bus | Dr. Frank Munz Dr. Frank Munz shares advice and resources for those interested in getting started with Oracle Service Bus. One-Stop Shop for Oracle Webcasts Webcasts can be a great way to get information about Oracle products without having to go cross-eyed reading yet another document off your computer screen. Oracle's new Webcast Center offers selectable filtering to make it easy to get to the information you want. Yes, you have to register to gain access, but that process is quick, and with over 200 webcasts to choose from you know you'll find useful content. Thought for the Day "There is only one thing more painful than learning from experience and that is not learning from experience." — Archibald MacLeish (May 7, 1892 – April 20, 1982) Source: SoftwareQuotes.com

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High availability for Windows Service under Windows Server 2003

- by empi

Hi. I have a following situation: I need to deploy a windows service that listens for incoming request on tcp port (basically WCF service). I have a High Availability requirement - the service must be deployed on two servers and if the service stops (only the service, not the whole server) on one server, all the requests must be redirected to the second one. For me it looks like a basic failover scenario. How can I achieve this on Windows Server 2003? Should I use Microsoft Cluster Service or Network Load Balancing? The important part is that the process of swapping the servers should not concern the clients (the client must see only single address / single host or domain name). Thanks in advance for help.

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OpenJDK 6 B24 Available

- by user9158633

On November 16, 2011 the source bundle for OpenJDK 6 b24 was published at http://download.java.net/openjdk/jdk6/. The main changes in b24 are the latest round of security updates (e.g. the security changes in jdk repo) and a few other fixes. For more information see the detailed list of all the changes in OpenJDK 6 B24. Test Results: All the jdk regression tests run with make test passed. cd jdk6 make make test Per Kelly's B23 Release blog: The new process is - all the jdk regression tests run with make test should just pass. Over time we will fix the tests that have been excluded, possibly add more tests, and exclude tests that fail to demonstrate stability (with a bug filed against the test). For the current list of excluded tests see jdk6/jdk/test/ProblemList.txt file: ProblemList.html in B24 | Latest ProblemList.txt (in the tip revision). Special thanks to Kelly O'Hair for his direction and Dave Katleman for his Release Engineering work.

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Discuss: PLs are characterised by which (iso)morphisms are implemented

- by Yttrill

I am interested to hear discussion of the proposition summarised in the title. As we know programming language constructions admit a vast number of isomorphisms. In some languages in some places in the translation process some of these isomorphisms are implemented, whilst others require code to be written to implement them. For example, in my language Felix, the isomorphism between a type T and a tuple of one element of type T is implemented, meaning the two types are indistinguishable (identical). Similarly, a tuple of N values of the same type is not merely isomorphic to an array, it is an array: the isomorphism is implemented by the compiler. Many other isomorphisms are not implemented for example there is an isomorphism expressed by the following client code: match v with | ((?x,?y),?z = x,(y,z) // Felix match v with | (x,y), - x,(y,z) (* Ocaml *) As another example, a type constructor C of int in Felix may be used directly as a function, whilst in Ocaml you must write a wrapper: let c x = C x Another isomorphism Felix implements is the elimination of unit values, including those in tuples: Felix can do this because (most) polymorphic values are monomorphised which can be done because it is a whole program analyser, Ocaml, for example, cannot do this easily because it supports separate compilation. For the same reason Felix performs type-class dispatch at compile time whilst Haskell passes around dictionaries. There are some quite surprising issues here. For example an array is just a tuple, and tuples can be indexed at run time using a match and returning a value of a corresponding sum type. Indeed, to be correct the index used is in fact a case of unit sum with N summands, rather than an integer. Yet, in a real implementation, if the tuple is an array the index is replaced by an integer with a range check, and the result type is replaced by the common argument type of all the constructors: two isomorphisms are involved here, but they're implemented partly in the compiler translation and partly at run time.

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QA & Testing with UPK

- by dan.gallo(at)oracle.com

Most customers know that UPK produces both the word and excel based test scripts for UAT. Did you know that you can use UPK for QA review and bug tracking? To use UPK for QA, create content and assign it appropriately to authorized reviewers. Then have them open the developer, use customized views to find content assigned to them quickly and check out the topics. Then they can use the topic editor to review the content and provide comments right into the bubbles or use explanation frames. It makes QA-ing content this way easier than publishing and sending out .tpcs or docs for people to review. How about UPK for bug tracking? The hardest part about fixing bugs in software is reproducing the error! When you use UPK for bug tracking, it captures the exact steps the user took that gave them the error. Now development can easily walk through the process in a simulated environment to see what might have caused it, they have a documented procedure for what generated the error and they are able to better communicate with the LOB. Also, they can update or attach the simulation\documentation to any defect management software like bugzilla or something similar -all thanks to UPK.

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ArchBeat Link-o-Rama for 2012-09-27

- by Bob Rhubart

Understanding Oracle BI 11g Security vs Legacy Oracle BI 10g | Christian Screen "After conducting a large amount of Oracle BI 10g to Oracle BI 11g upgrades and after writing the Oracle BI 11g book," says Oracle ACE Christian Screen, "I still continually get asked one of the most basic questions regarding security in Oracle BI 11g; How does it compare to Oracle BI 10g? The trail of questions typically goes on to what are the differences? And, how do we leverage our current Oracle BI 10g security table schema in Oracle BI 11g?" Process Oracle OER Events using a simple Web Service | Bob Webster Bob Webster's post "provides an example of a simple web service that processes Oracle Enterprise Repository (OER) Events. The service receives events from OER and utilizes the OER REX API to implement simple OER automations for selected event types." Oracle Fusion Middleware Security: Attaching OWSM policies to JRF-based web services clients | Andre Correa "OWSM (Oracle Web Services Manager) is Oracle's recommended method for securing SOAP web services," says Oracle Fusion Middleware A-Team member Andre Correa. "It provides agents that encapsulate the necessary logic to interact with the underlying software stack on both service and client sides. Such agents have their behavior driven by policies. OWSM ships with a bunch of policies that are adequate to most common real world scenarios." His detailed post shows how to make it happen. WebCenter Content (WCC) Trace Sections | ECM Architect ECM Architect Kevin Smith shares a detailed technical post covering WebCenter Content (WCC) Trace sections. Thought for the Day "A complex system that works is invariably found to have evolved from a simple system that worked." — John Gall Source: SoftwareQuotes.com

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yum not able to install a package

- by shadyabhi

[root@mypc yum.repos.d]# yum search perl-Locale-gettext Loaded plugins: dellsysid, fastestmirror Repository tmz-puppet is listed more than once in the configuration Loading mirror speeds from cached hostfile * atomic: www6.atomicorp.com * base: mirror.trouble-free.net * epel: mirrors.tummy.com * extras: eq-centosrepo.hopto.org * rpmforge: mirror.hmc.edu * updates: mirror.team-cymru.org =================================================================== N/S Matched: perl-Locale-gettext ==================================================================== perl-Locale-gettext.x86_64 : Internationalization for Perl Name and summary matches only, use "search all" for everything. [root@mypc yum.repos.d] And [root@mypc yum.repos.d]# yum install perl-Locale-gettext Loaded plugins: dellsysid, fastestmirror Repository tmz-puppet is listed more than once in the configuration Loading mirror speeds from cached hostfile * atomic: mir01.syntis.net * base: mirrors.gigenet.com * epel: mirror.us.leaseweb.net * extras: centos.mirror.lstn.net * rpmforge: mirror.hmc.edu * updates: centos.mirror.choopa.net Setting up Install Process Nothing to do [root@mypc yum.repos.d]# What is going wrong here?

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Monitor Processes' Memory Usage

- by Alvin Sim

We have an IBM P series box running AIX 5.3. This is our application server, whereby our J2EE application is running in Oracle's Applications Server (version 10g r2). At around 11pm till the next day 7am, we have shell scripts running, which executes Java class programs. Recently, this server has been experiencing some high memory usage, which caused some of the Java class programs throwing "Out of memory" exception . We normally use NMON to monitor the server's resources, such as CPU, I/O, memory, etc. But because of this OOM issue, we would like to know throughout the day, what are the processes which are running and how much memory each process consumed. NMON is not able to show this. Even with the "-T" parameter, it only shows the top processes and not all. Is there any thing we can use to monitor all the processes' memory?

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Debian wheezy keyboard shortcut for both opening and closing a terminal

- by Peter

I recently installed tilda and I would like to open it and close with the same keyboard shortcut. I wrote little something in bash that closes tilda if it is open and opens tilda when there is no such a process in ps -ef. It looks like this: a=ps -ef | fgrep -i tilda | cut -d' ' -f4 | head -1;if [ $a ] ; then kill $a; else tilda; fi It seems to be working (at least partially) when I commit this in terminal, but when I assign this command to specific keyboard shortcut (for example alt+1) it does nothing. Any suggestions? btw. is it possible to assign this shortcut for button '`' like in Quake?

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How to manage drawing loop when changing render targets

- by George Duckett

I'm managing my game state by having a base GameScreen class with a Draw method. I then have (basically) a stack of GameScreens that I render. I render the bottom one first, as screens above might not completely cover the ones below. I now have a problem where one GameScreen changes render targets while doing its rendering. Anything the previous screens have drawn to the backbuffer is lost (as XNA emulates what happens on the xbox). I don't want to just set the backbuffer to preserve its contents as I want this to work on the xbox as well as PC. How should I manage this problem? A few ideas I've had: Render every GameScreen to its own render target, then render them all to the backbuffer. Create some kind of RenderAction queue where a game screen (and anything else I guess) could queue something to be rendered to the back buffer. They'd render whatever they wanted to any render target as normal, but if they wanted to render to the backbuffer they'd stick that in a queue which would get processed once all rendertarget rendering was done. Abstract away from render targets and backbuffers and have some way of representing the way graphics flows and transforms between render targets and have something manage/work out the correct rendering order (and render targets) given what rendering process needs as input and what it produces as output. I think each of my ideas have pros and cons and there are probably several other ways of approaching this general problem so I'm interested in finding out what solutions are out there.

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Joomla 1.5 Media Manager sets incorrect file permissions when uploading

- by Scott Mayfield

Howdy all, I have a Joomla 1.5 installation running on Windows Server 2008, installed via the Web Platform Installer. When uploading images with the media manager (native uploader, not the flash bulk uploader), the files arrive on the server correctly, but are given incorrect permissions. Specifically, the IIS_IUSRS group is not given access to the file. I might be incorrect about what group/user is SUPPOSED to get access to the files, but so far, I've found that unless I give IIS_IUSRS access to the uploaded files, they won't appear on the site or in the media manager (appear as broken images). Once I give IIS_IUSRS permission to the files, they work fine. So far, all the research I've done has led me to linux specific fixes that involve either changing the umask on the server, or directly modifying the Joomla codebase to add an appropriate chmod command to the upload process, but I really don't want to modify Joomla directly. I have to believe there's a setting here somewhere that will do the job, either on the Joomla or Windows side of the equation. Any thoughts? Scott

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Free, Linux-based rescue CD for Windows machines

- by Adam Matan

Hi, Too often, I'm being called to help a friend who screwed a Windows machine by some creative methods. Th usual remedy is backing up the hard drive contents and reinstalling. Right now, this is done by removing the defected hard drive to my machine. I figured out that using a rescue disk running some version of Linux might ease the process. I'm looking for: NTFS access Partition tools Large variety of drivers (Network, Hard drives, etc.) GUI and some rescue wizards a great plus. Any ideas? Adam

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SSIS Denali as part of “Enterprise Information Management”

- by jorg

When watching the SQL PASS session “What’s Coming Next in SSIS?” of Steve Swartz, the Group Program Manager for the SSIS team, an interesting question came up: Why is SSIS thought of to be BI, when we use it so frequently for other sorts of data problems? The answer of Steve was that he breaks the world of data work into three parts: Process of inputs BI Enterprise Information Management All the work you have to do when you have a lot of data to make it useful and clean and get it to the right place. This covers master data management, data quality work, data integration and lineage analysis to keep track of where the data came from. All of these are part of Enterprise Information Management. Next, Steve told Microsoft is developing SSIS as part of a large push in all of these areas in the next release of SQL. So SSIS will be, next to a BI tool, part of Enterprise Information Management in the next release of SQL Server. I'm interested in the different ways people use SSIS, I've basically used it for ETL, data migrations and processing inputs. In which ways did you use SSIS?

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How to get partition information from non-booting server?

- by gravyface

Need to manually rebuild a mirrored array on a server and am in the process of reinstalling SBS 2003 on it. However, it's a Dell server, and know that there's the Dell FAT32 diagnostics partition, a system partition, and a data partition, but do not know the size of each. Planning on reinstalling SBS 2003, all applications on the server, and then doing a System State restore, but figured that not having the correct partitions will cause some grief: am I right? Almost thinking that the size of the partitions shouldn't matter, but not positive. Question: should I care about the size of the partition? If so, how can I get this partition information from a non-booting drive? We have an Acronis image of the one working disk and the partitions are mounted/viewable in Explorer on a workstation, but I'm not sure where the Logical Disk Manager/Disk Management data is stored and/or if there's a way to retrieve it without having a working Windows installation.

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