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  • SCSI vs SATA? Is SCSI "actually" better?

    - by earlz
    Well, I was talking with a guy about servers the other day. I was a bit shocked whenever I asked him if there was any significant difference between SCSI and SATA and why he always uses SCSI. (note, I'm not sure if by SCSI he meant SAS) He told me that SCSI is always faster and that the drives are always more reliable.. I mean, this seems like a bold statement. He told me something about how SCSI will always be faster than SATA because the OS sends the SCSI (controller?) a request to get a file and it will build the file inside of the SCSI controller, instead of searching all over the disk.. which I do not understand how that would work, so I figure it is BS. SAS and SATA currently have equivalent data rate speeds.. Is there any true backing for his reasoning that SCSI is always faster and more reliable than SATA?

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  • Best way to compare (diff) a full directory structure?

    - by Adam Matan
    Hi, What's the best way to compare directory structures? I have a backup utility which uses rsync. I want to tell the exact differences (in terms of file sizes and last-changed dates) between the source and the backup. Something like: Local file Remote file Compare /home/udi/1.txt (date)(size) /home/udi/1.txt (date)(size) EQUAL /home/udi/2.txt (date)(size) /home/udi/2.txt (date)(size) DIFFERENT Of course, the tool can be ready-made or an idea for a python script. Many thanks! Udi

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  • Is there a program that compares image files and reports if they are exactly the same pixel-wise?

    - by Nathaniel Drake
    I'm making a regression testing suite for some rendering software. I need to be able to load an image file (PNG or TGA, ideally) and compare the pixel values to a standard approved image. I'd like it to be command line driven too, so I can make a batch file to run all the tests. All the compare utilities I have found so far either show differences (I just need it to fail if they are different) or compare all the bytes, meaning that meta-data will trigger a fail. Anyone got any suggestions? I am not a coder, and can only barely cobble a batch script together. Thanks for any suggestions.

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  • What can be done in Windows 7 that can't be done in Windows XP?

    - by emddudley
    In Jeff Atwood's latest blog entry on Windows 7 he talks about getting people to move off Windows XP. What, specifically, can be done in Windows 7 that cannot be done in Windows XP? I'm not looking for usability or GUI improvements, unless they happen to significantly reduce the time that it takes to perform tasks that were previously prohibitively time consuming.

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  • How to check database has not been unmounted/ marked for overwrite

    - by RPS
    Hi When restoring Exchange with use of VSS API try to catch errors in cases: 1) when restoring database has not been unmounted Exchange 2010 generate error on PreRestore call and write error to Windows Application log -all ok , but for Exchange2007 PreRestore succeded and write error toWindows Application log only 2)when restored database has been unmounted but has not been marked for overwrite Exchange 2007/2010 generate error to Windows Application log but PreRestore call succeded How can I know from application (via VSS API - not from Windows Application log) that error has happend (database has not been unmounted and has not been marked for overwrite. ) Thanks

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  • Pervasive database backup

    - by Steven
    I'm looking for the best way to backup my pervasive database. I've read the documentation but still have a few questions. It appears that Continuous Operations method only allows me to backup the entire database? So I'd do butil -startbu @filelist, then backup the entire database (copy, rsync, etc), then run butil -endbu @filelist. Looking through the documentation I don't see a way to get transaction logs out of this method; like I would do for MSSQL (BACKUP LOG ACCT TO DISK) or Postgres (archive_command). With rsync, it might be feasible to still do this every 15 minutes. The Archival Logging method means I would have to occasionally stop the database to get a full backup, which is acceptable for me. But can I copy the log files off of the server every 15 minutes, ie log shipping? Thank you.

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  • Specifying Multiplicity in a Visio Database (ERD) Diagram

    - by Nitrodist
    Is there a way to manually edit the cardinality/multiplicity symbols on the end of a database ERD made in Visio? The category I'm using is in Visio 2003 under Database -> Database Model Diagram I want to be able to go from something like this: To this: The second graphic was done by manually adding the numbers, but I would prefer to just do it in Visio. Is there any way of accomplishing this?

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  • SQL Server 2008 login problem with ASP.NET application: Failed to open the explicitly specified database

    - by eulerfx
    I am running SQL Server 2008 Express Edition on Windows Server 2008 with an ASP.NET application which must access the server. The ASP.NET application is associated with an application pool that runs on the NetworkService account. This account in turn has a Login and User record on SQL Server in the required database. When I attempt to run the ASP.NET website I get a blank page and when viewed in the error log, I seem to be getting this information event record: Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Reason: Failed to open the explicitly specified database. [CLIENT: myLocalMachine] The connection string has Trusted_Connection=True; and the required database specified. When I explicitly specify the user name and password I get another login error stating the password is incorrect, even though the same un/pw combination works through SQL Server Management studio. The NETWORK SERVICE account seems to have all the required privileges for the database. Also, I made a test ASP.NET website project which does a simple select from a table in that database, and using the same config file I am not getting the error and it seems to work. Is it something to do with trust levels then, because the original ASP.NET web app references various DLLs including open source libraries. Also, the application does not seem to be able to write to the event log itself, throwing a security exception, even though everything in the config files, including machine.config states the app is in full trust.

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  • How can I compare effective power usage of two CPUs / CPU+Mobo+Mem combinations?

    - by einpoklum
    I have this server which does mostly file sharing (with the associated storage). No serious number crunching and it isn't the firewall. My current box has a Celeron D processor (Prescott 336 2.8 GHz); and I'm considering replacing it with a Pentium D (Smithfield 805 2.66 GHz) - for reasons which do not involve performance. How can I know whether one can expect a higher or lower power consumptipn for the change? And how can I estimate the power consumption for each option?

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  • Granting rights on postgresql database to another user

    - by Austin
    I'm trying to set up a system with a PostgreSQL database per user, with a PHP-FPM resource pool for an associated account. I need to grant all privileges on the database to the other user, but it seems that it's only possible to do this for tables. I've tried grant all privileges on database username to username_shadow but this gives only limited privileges. I've upgraded to PGSQL 9.2, which has the ability to grant privileges on schema, but I can't get a useful result. How do I simply make another user have all the privileges of the first on the same database?

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  • What are the small details Windows and Linux users will trip on when using OSX for the first time?

    - by badp
    Like any other Apple product, OS X prides itself on the little details. When, earlier last week, I used my professor's Mac briefly to give a quick project presentation (mine decided to do a chkdsk at the wrong time, heh), I got the distinct feeling some were put intentionally to make the uninitiated look stupid. What are the small usability details that Windows and Linux users will trip on when their Mac using friend lend them their beloved Mac for some quick web browsing?

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  • Django - Moving database from development to production servers

    - by Garfonzo
    I am working on a Django project with a MySQL backend. I'm curious about the best way to update a production server's database to reflect the changes made on the development server's database? When I develop now, I make some changes to a models.py file, then to a schemamigration using South. Sometimes I do several migrations across several apps within the main project folder before it's ready for the production database. This means that there are several migration files in the app/migrations/ folder created by South. So on the production server, how does one update the database to reflect all the changes made in development, without having any data loss?

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  • Index fragmentation and reorganizing database pages

    - by TiQ
    Say you have a database with heavy index fragmentation. Say this database also has a lot of free space due to frequent deletes in its data file. This free space is not contiguous. If I rebuild all indexes to remove fragmentation and then reorganize the database pages so allocated pages and free pages are contiguous, would this cause further fragmentation in my indexes? I guess the question can be posed as: if it matters, which should I do first, reorganize or rebuild?

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  • Debian or CentOS?

    - by Tres
    I am looking at using either Debian or CentOS for a production server and I've heard mixed reviews of each one. I've heard CentOS performs better under load, however I am aware that Debian has a much larger package repository. Personally, I am partial to Debian since I am less familiar with Red Hat distros, but wanted to reach out on Server Fault to see which I really should be using. Any ideas? Thanks!

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  • Know any file compare utility for chunks of text?

    - by Belun
    Is there any file-compare utility-software that can help me compare chunks of text from two text files ? As in, I want to know what chunks of text that are in one file can be found again in the second file. What I need to do is more like a 'compare and search' operation, not just a compare line by line. I need this for finding common errors in application logs. Eg., I have a Java application and logs from two different days. I want to find out which stack-traces (that are actually chunks of text inside a text file) are common to both days.

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