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• System Slow After Uprading Ubuntu

  - by Aragon N

  i have an ubuntu network machine which has release of 10.04.1 LTS Lucid. on this system i have apache, postgresql and django. for some app. development i have to install php and php-curl... due to being on network, i have exported wmvare machine to internet and firstly i have upgraded system and then install php5 packages on it. After all replacing it with its old place, i have considered that the new system query is some slow according to another. Old system query time : 140 ms New system query time : 9.11 s i have checked /etc/network interface and it seems there is no problem. i have checked /etc/resolv.conf and it seems ok i have checked /etc/nsswitch.conf and only host section is different from old one which old system has hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 and then i have checked time host -t A services.myapp.com and i got real 0m0.355s user 0m0.010s sys 0m0.020s and now what can i have to check for boosting my system as before?

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• machine crash when connecting to external harddisk

  - by Gnot

  i recently had a problem with my laptop. when i booted up the machine, i would get a SMART failure error message and when i pressed F1 to continue, it would take a very long time to boot and it would come back to the same error message again. thinking that my hard disk was dying, i bought a new hard disk and installed on my laptop and so now my laptop is alright. however i need to recover data from that old hard disk, so i bought an external hard disk case and placed the old hard disk onto the case and connected to my laptop with USB. the first few times when i connected, i could see the files from the old hard disk and managed to copy some files over although it took extremely long to transfer. but now whenever i connect to the old hard disk, after a few minutes, my laptop will crash and re-boot. do you think my old hard disk is dead beyond repair? or you can offer some help here? any assistance would be appreciated!

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• erratic audio levels on windows vista

  - by old retired dude

  I'm somewhat hard of hearing. I've been listening to my windows Vista machine with a pair of headphones so I don't annoy the others. I have 2 issues: 1) the volume varies enormously depending on the source. Having a windows alert occur while I am listening to a DVD or Youtube is a painful experience. Is there a preferred way to set all the different audio controls so I have a more constant volume? I already have lowered the volumes of the windows alerts. 2)Is there a way to limit the volume of my headphones to protect what is left of my hearing? Is there a software solution or should I be going for a hardware limiter? thanks retired dude

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• One to many problem with implementing 301 redirect after changed urls

  - by user16136

  I have a problem. I had an old dynamic url which I have now split into multiple static urls. e.g. www.mydomain.com/product.php?type=1&id=2 www.mydomain.com/product.php?type=2&id=3 www.mydomain.com/product.php?type=2&id=4, etc which I have changed to something like www.mydomain.com/electronics/radio www.mydomain.com/electronics/television www.mydomain.com/mobile/smartphone, etc. Google has previously indexed the dynamic urls and search results show the old urls. I want search to point to the new urls. I have kept the old url active, so both urls work. How can I set up a 301 redirect in this case? I run IIS and it only allows a page to be redirected to 1 url. Should I deactivate the old dynamic url? In that case I lose all the previous seo rankings..

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• Missing Fields and Default Values

  - by PointsToShare

  © 2011 By: Dov Trietsch. All rights reserved Dealing with Missing Fields and Default Values New fields and new default values are not propagated throughout the list. They only apply to new and updated items and not to items already entered. They are only prospective. We need to be able to deal with this issue. Here is a scenario. The user has an old list with old items and adds a new field. The field is not created for any of the old items. Trying to get its value raises an Argument Exception. Here is another: a default value is added to a field. All the old items, where the field was not assigned a value, do not get the new default value. The two can also happen in tandem – a new field is added with a default. The older items have neither. Even better, if the user changes the default value, the old items still carry the old defaults. Let’s go a bit further. You have already written code for the list, be it an event receiver, a feature receiver, a console app or a command extension, in which you span all the fields and run on selected items – some new (no problem) and some old (problems aplenty). Had you written defensive code, you would be able to handle the situation, including similar changes in the future. So, without further ado, here’s how. Instead of just getting the value of a field in an item – item[field].ToString() – use the function below. I use ItemValue(item, fieldname, “mud in your eye”) and if “mud in your eye” is what I get, I know that the item did not have the field.   /// <summary> /// Return the column value or a default value /// </summary> private static string ItemValue(SPItem item, string column, string defaultValue) {     try     {         return item[column].ToString();     }     catch (NullReferenceException ex)     {         return defaultValue;     }     catch (ArgumentException ex)     {         return defaultValue;     } } I also use a similar function to return the default and a funny default-default to ascertain that the default does not exist. Here it is:  /// <summary> /// return a fields default or the "default" default. /// </summary> public static string GetFieldDefault(SPField fld, string defValue) {     try     {         // -- Check if default exists.         return fld.DefaultValue.ToString();     }     catch (NullReferenceException ex)     {         return defValue;     }     catch (ArgumentException ex)     {         return defValue;     } } How is this defensive? You have trapped an expected error and dealt with it. Therefore the program did not stop cold in its track and the required code ran to its end. Now, take a further step - write to a log (See Logging – a log blog). Read your own log every now and then, and act accordingly. That’s all Folks!

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• Need to move a debian server from i686 to x86_64 architecture

  - by user64204

  I have a debian server that I need to move from one hosting provider to another. I don't really know how the old server was setup, all I know is that it's running a Ruby on Rails application with a lot of custom libraries installed and that I should prepare myself for a painful migration. Old server: -os: debian 5.0.9 -used disk space: 3.2GB -architecture: i686 New server: -os: debian 5.0.9 -free disk space: 10GB -architecture: x86_64 As you can see the problem is that the servers are running different architectures. Q: Is there anyway I could somehow migrate the old to the new server in a few steps (or am I just dreaming I could) ? I was thinking maybe I could: -get list of packages and gems installed on old server and use for loop to install them all on the new -copy the disk content from old to new server while excluding what is architecture-specific (the problem is that I don't really know what to exclude).

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• Cloning Windows 2003 Server to new hard drive results in failure

  - by Level1Coder

  Scenario: Old hdd is a Seagate 320gb SATA drive New hdd is a WD 320gb SATA drive Created an exact clone and replaced old hdd with new hdd. Boot up with new hdd, it gets into Windows 2003 server environment but things look weird. Lots of system event failures in the event viewer log. System is barely unusable, critical services are all down. Boot up with old hdd, everything is fine. QUESTION: Is it possible to do a simple clone of a Windows 2003 server system? All I'm changing is the hard drive, everything else stays the same (old CPU/old mobo/etc..)

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• Domain migration - 301 Redirect of all contentes of directory)

  - by Trufa

  Hi, I would like to know if it is possible to do the following considering that I would like to migrate domains. I have lets say: one.com/files/one.html one.com/files/two.php one.com/other/three.html one.com/other/four.doc one.com/other/subdirectory/five.doc I am migrating to two.com So I would like to make RESPECTIVE 301 redirects to the following: two.com/old/files/one.html two.com/old/files/two.php two.com/old/other/three.html two.com/old/other/four.doc two.com/old/other/subdirectory/five.doc I've tried with cPanel and although I come "close" with the redirects option I can't seem to make it happen. The folders are not much (10 -12) the file are a lot, and obviously impossible to make it manually. How would you proceed? Can this/ should this be done with regex from the .htaccess?? Can you direct all the elements of a subdirectory in the manner expressed above? I hope the question is clear enough, if not please ask for any clarification needed!! Thanks in advance!!

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• Dealing with numerous, simultaneous sounds in unity

  - by luxchar

  I've written a custom class that creates a fixed number of audio sources. When a new sound is played, it goes through the class, which creates a queue of sounds that will be played during that frame. The sounds that are closer to the camera are given preference. If new sounds arrive in the next frame, I have a complex set of rules that determines how to replace the old ones. Ideally, "big" or "important" sounds should not be replaced by small ones. Sound replacement is necessary since the game can be fast-paced at times, and should try to play new sounds by replacing old ones. Otherwise, there can be "silent" moments when an old sound is about to stop playing and isn't replaced right away by a new sound. The drawback of replacing old sounds right away is that there is a harsh transition from the old sound clip to the new one. But I wonder if I could just remove that management logic altogether, and create audio sources on the fly for new sounds. I could give "important" sounds more priority (closer to 0 in the corresponding property) as opposed to less important ones, and let Unity take care of culling out sound effects that exceed the channel limit. The only drawback is that it requires many heap allocations. I wonder what strategy people use here?

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• Laptop crashes when connecting to external harddisk

  - by Gnot

  I recently had a problem with my laptop. when I booted up the machine, I would get a SMART failure error message and when I pressed F1 to continue, it would take a very long time to boot and it would come back to the same error message again. Thinking that my hard disk was dying, I bought a new hard disk and installed on my laptop and so now my laptop is alright. However I need to recover data from that old hard disk, so I bought an external hard disk case and placed the old hard disk onto the case and connected to my laptop with USB. The first few times when I connected, I could see the files from the old hard disk and managed to copy some files over although it took extremely long to transfer. But now whenever I connect to the old hard disk, after a few minutes, my laptop will crash and re-boot. Do you think my old hard disk is dead beyond repair? Or you can offer some help here? Any assistance would be appreciated!

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• How can I redirect all files in a directory that doesn't conform to a certain filename structure?

  - by user18842

  I have a website where a previous developer had updated several webpages. The issue is that the developer had made each new webpage with new filenames, and deleted the old filenames. I've worked with .htaccess redirects for a few months now, and have some understanding of the usage, however, I am stumped with this task. The old pages were named like so: www.domain.tld/subdir/file.html The new pages are named: www.domain.tld/subdir/file-new-name.html The first word of all new files is the exact name of the old file, and all new files have the same last 2 words. www.domain.tld/subdir/file1-new-name.html www.domain.tld/subdir/file2-new-name.html www.domain.tld/subdir/file3-new-name.html ect. We also need to be able to access the url: www.domain.tld/subdir/ The new files have been indexed by google (the old urls cause 404s, and need redirected to the new so that google will be friendly), and the client wants to keep the new filenames as they are more descriptive. I've attempted to redirect it in many different ways without success, but I'll show the one that stumps me the most RewriteBase / RewriteCond %{THE_REQUEST} !^subdir/.*\-new\-name\.html RewriteCond %{THE_REQUEST} !^subdir/$ RewriteRule ^subdir/(.*)\.html$ http://www.domain.tld/subdir/$1\-new\-name\.html [R=301,NC] When visiting www.domain.tld/subdir/file1.html in the browser, this causes a 403 Forbidden error with a url like so: www.domain.tld/subdir/file1-new-name-new-name-new-name-new-name-new-name-new-name-new-name-new-name-new-name-new-name-new-name-new-name-new-name.html I'm certain it's probably something simple that I'm overlooking, can someone please help me get a proper redirect? Thanks so much in advance! EDIT I've also got all the old filenames saved on a separate document in case I need them set up like the following example: (file(1|2|3|4|5)|page(1|2|3|4|5)|a(l(l|lowed|ter)|ccept)

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• Cron job failing to backing up a Postgres database

  - by user705142

  I'm unsure what's going on here: I've got a backup script which runs fine under root. It produces a 300kb database dump in the proper directory. When running it as a cron job with exactly the same command however, an empty gzip file appears with nothing in it. The cron log shows no error, just that the command has been run. This is the script: #! /bin/bash DIR="/opt/backup" YMD=$(date "+%Y-%m-%d") su -c "pg_dump -U postgres mydatabasename | gzip -6 > "$DIR/database_backup.$YMD.gz" " postgres # delete backup files older than 60 days OLD=$(find $DIR -type d -mtime +60) if [ -n "$OLD" ] ; then echo deleting old backup files: $OLD echo $OLD | xargs rm -rfv fi And the cron job: 01 10 * * * root sh /opt/daily_backup_script.sh It produces a database_backup file, just an empty one. Anyone know what's going on here?

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• Computer won't start when connecting SATA HDD

  - by vlad

  I just bough a new HDD some time ago and recently i bought another SATA cable to have both HDDs connected at the same time, to transfer all the files from the older one to the newer. When i connected both of them, the computer started working, i tapped F2 to go to bios to make sure it was detected, and then after 5-10 seconds the computer instantly shut down. After this incident, my computer won't start at all when connecting the SATA power supply to the old HDD. If i connect only my new drive, it works without any problem. If i connect only my old drive, or both the old drive and the new one, and then push on the power button, the cpu fan simply rotates about 5 degrees and then stops.. and that's it, the computer doesn't start, and no sound from the pc speaker either. Is there any way to recover my files from the old HDD and transfer them to my new one? I do not want to use the old HDD any more, i only need to save all my files.

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• Javascript Square bracket notation for global variables

  - by Yousuf Haider

  I ran into an interesting issue the other day and was wondering if someone could shed light on why this is happening. Here is what I am doing (for the purposes of this example I have dumbed down the example somewhat): I am creating a globally scoped variable using the square bracket notation and assigning it a value. Later I declare a var with the same name as the one I just created above. Note I am not assigning a value. Since this is a redeclaration of the same variable the old value should not be overriden as described here: http://www.w3schools.com/js/js_variables.asp //create global variable with square bracket notation window['y'] = 'old'; //redeclaration of the same variable var y; if (!y) y = 'new'; alert(y); //shows New instead of Old The problem is that the old value actually does get overriden and in the above eg. the alert shows 'new' instead of 'old'. Why ? I guess another way to state my question is how is the above code different in terms of semantics from the code below: //create global variable var y = 'old'; //redeclaration of the same variable var y; if (!y) y = 'new'; alert(y); //shows New instead of Old

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• Moral fits the story or suggest me a nice moral?

  - by Gobi

  A 25 year old son was sitting beside his old father in a train one day. When the train was about to leave, all the passengers started settling down in their seats. The son was filled with joy and anxiety. He was seated by the window. He put his hand out and felt the breeze and screamed, “ Papa look at all the trees, they are moving behind”. The old father smiled and admired his son’s feelings. Beside the old man, a couple was also travelling and observed this strange behavior. They found something awkward and childish in the behavior of this 25 year old man. All of a sudden, the son shouted again “Papa see! The clouds are moving about; there is a pond down and many cows are drinking it’s water”. It soon started drizzling. Once again, the young man felt exited and said “papa, I can see and feel the rain drops touching my hand”. The couple seeing this and feeling concerned, asked the old man “why don’t you consult a good doctor and treat your son; don’t you find something abnormally different in him ?” The old man replied, “Yes, I have provided the best treatment for my only boy. We are just returning from the hospital. I am happy for today is the day he has received his sense of sight. It’s for the first time my son is seeing and relishing these little wonders which we have been watching and ignoring in our routine life!” The couple had no words to reply and felt sorry for their remarks. Moral of the story: “ “don’t judge a book by its cover”. is this the moral fits the story or provide me some moral for this story :)

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• Scheme: what are the benefits of letrec?

  - by Ixmatus

  While reading "The Seasoned Schemer" I've begun to learn about letrec. I understand what it does (can be duplicated with a Y-Combinator) but the book is using it in lieu of recurring on the already defined function operating on arguments that remain static. An example of an old function using the defined function recurring on itself (nothing special): (define (substitute new old lat) (cond ((null? l) '()) ((eq? (car l) old) (cons new (substitute new old (cdr l)))) (else (cons (car l) (substitute new old (cdr l)))))) Now for an example of that same function but using letrec: (define (substitute new old lat) (letrec ((replace (lambda (l) (cond ((null? l) '()) ((eq? (car l) old) (cons new (replace (cdr l)))) (else (cons (car l) (replace (cdr l)))))))) (replace lat))) Aside from being slightly longer and more difficult to read I don't know why they are rewriting functions in the book to use letrec. Is there a speed enhancement when recurring over a static variable this way because you don't keep passing it?? Is this standard practice for functions with arguments that remain static but one argument that is reduced (such as recurring down the elements of a list)? Some input from more experienced Schemers/LISPers would help!

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• How to deal with a Java serialized object whose package changed?

  - by Alex

  I have a Java class that is stored in an HttpSession object that's serialized and transfered between servers in a cluster environment. For the purpose of this explanation, lets call this class "Person". While in the process of improving the code, this class was moved from "com.acme.Person" to "com.acme.entity.Person". Internally, the class remains exactly the same (same fields, same methods, same everything). The problem is that we have two sets of servers running the old code and the new code at the same time. The servers with the old code have serialized HttpSession object and when the new code unserializes it, it throws a ClassNotFoundException because it can't find the old reference to com.acme.Person. At this point, it's easy to deal with this because we can just recreate the object using the new package. The problem then becomes that the HttpSession in the new servers, will serialize the object with the new reference to com.acme.entity.Person, and when this is unserialized in the servers running the old code, another exception will be thrown. At this point, we can't deal with this exception anymore. What's the best strategy to follow for this kind of cases? Is there a way to tell the new servers to serialize the object with the reference to the old package and unserialize references to the old package to the new one? How would we transition to using the new package and forgetting about the old one once all servers run the new code?

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• Deserialization of a DataSet... deal with column name changes? how to migrate data from one column to another?

  - by Brian Kennedy

  So, we wanted to slightly generalize a couple columns in our typed dataset... basically dropped a foreign key constraint and then wanted to change a couple column names to better reflect their new state. All that is easy. The problem is that our users may have serialized out the old version of the DataSet as XML. We want to be able to read those old XML files and deserialize them into the revised DataSet. It seems that would be a fairly common desire... but I haven't yet figured out the right thing to search the internet for. One possible solution would seem to be some way to give a DataColumn an alias or alternate name such that when it reads the old column name, it knows that data can be read into the column with the new column name. I can find no support for any such thing. Another approach would seem to be an "after deserialization" method of some sort... so, I would let it read in the old column values into a normal DataColumn with that name, and then in the "after deserialization" method I would just move the data from the obsolete column into the new column, and then delete the old columns. That would seem to generalize to many other situations... and having such events or hooks is pretty common in ADO.NET. But I have looked for such a hook and haven't yet found it. If no "after deserialization" hook, it would seem I ought to be able to override ReadXml or ReadXmlSerializable methods to call the base and then do my "after" stuff to fix up old data into new. But it does not appear that is possible. Soooo, I have to think backward compatibility with old serialized DataSets and simple data migration would be a well-solved problem... so, trying to reinvent that wheel seems silly. But so far, I haven't seemed to find any documentation on doing those things. Suggestions? What is best practice for this?

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• How can I synchronize one set of data with another?

  - by RenderIn

  I have an old database and a new database. The old records were converted to the new database recently. All our old applications continue to point to the old database, but the new applications point to the new database. Currently the old database is the only one being updated, so throughout the day the new database becomes out of sync. It is acceptable for the new database to be out of sync for a day, so until all our applications are pointed to the new database I just need to write a nightly cron job that will bring it up to date. I do not want to purge the new database and run the complete conversion script each night, as that would reduce uptime and would create a mess in our auditing of that table. I'm thinking about selecting all the data from the old database, converting it to the new database structure in memory, and then checking for the existence of each record before inserting it in the new database. After that's done, I'd select everything from the new database and check if it exists in the old one, and if not delete it. Is this the simplest way to do this?

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• VMWare ESXi, change the default path for a VM

  - by glenatron

  For some reason VMWare ESXi has decided that one of my VMs is on a completely different path to the path it is actually on. So my VM is on /vmfs/volumes/long-guid-here/my-vm-name but when I try to open it I get the message "File < unspecified filename was not found." Which is not really surprising as unspecified filenames are quite difficult to locate. I thought it was just the swap file, which was down in the .vmx file as /vmfs/volumes/long-guid-here/old-vm-name/old-vm-name.vmsd but when I changed that in the vmx it made no difference. What I can't figure out is where VMWare is getting the old-vm-name from- when I look in the "Settings" pane it believes the working file location to be "[datastore-name] old-vm-name\" and I can't find anywhere to change it. Now the files themselves are all named for old-vm-name - so the directory is /my-vm-name/old-vm-name.vmx and so on. Is this the cause of my problems or is there some arcane configuration option elsewhere around the VMWare machine that I need to be tinkering with?

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• Change which server mailbox is associated with in Exchange 2007

  - by tacos_tacos_tacos

  I have restored and mounted an EDB file onto a new Exchange 2007 Server. However, the old server is still online and although all the mailboxes I need are in the newly-mounted database, in Exchange 2007 System Manager it still shows that the mailbox is associated with the old server. If I try to "Move" the database it actually tries to copy the files from the old server to the new server, which is not necessary because they are already there - and produces and error about the mailbox on the destination already existing. How can I simply tell Exchange (AD?) to use the new server to find the mailbox rather than the old? Edit: I did the restore by taking the old server offline (turning off all Exchange services), copying EDB file to the new server, restoring it with eseutil, and mounting it to the new server. I did it this way in part because I didn't know a better way and in part because I couldn't use move-mailbox as the source location had a horrible Internet connection (which is why Exchange is being moved to the new location). I had to copy the EDB from the old server to a hard disk, go somewhere with a better Internet connection, upload the EDB to the new server.

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• Different versions of iperf for windows give totally different results

  - by Albert Mata

  Measuring TCP output from a Windows client to Solaris server: WXP SP3 with iperf 1.7.0 -- returns an average around 90Mbit Same client, same server but iperf 2.0.5 for windows -- returns an average of 8.5 Mbit Similar discrepancies have been observed connecting to other servers (W2008, W2003) It's difficult to get to some conclusions when different versions of the same tool provide vastly different results. Example below: C:\tempiperf -v (from iperf.fr) iperf version 2.0.5 (08 Jul 2010) pthreads C:\tempiperf -c solaris10 Client connecting to solaris10, TCP port 5001 TCP window size: 64.0 KByte (default) [ 3] local 10.172.181.159 port 2124 connected with 10.172.180.209 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.2 sec 10.6 MBytes 8.74 Mbits/sec Abysmal perfomance, but now I test from the same host (Windows XP SP3 32bit and 100Mbit) to the same server (Solaris 10/sparc 64bit and 1Gbit running iperf 2.0.5 with default window of 48k) with the old iperf C:\temp1iperf -v iperf version 1.7.0 (13 Mar 2003) win32 threads C:\temp1iperf.exe -c solaris10 -w64k Client connecting to solaris10, TCP port 5001 TCP window size: 64.0 KByte [1208] local 10.172.181.159 port 2128 connected with 10.172.180.209 port 5001 [ ID] Interval Transfer Bandwidth [1208] 0.0-10.0 sec 112 MBytes 94.0 Mbits/sec So one iperf with a 64k window says 8.75Mbit and the old iperf with the same window size says 94.0Mbit. These results are constant through repeated tests. From my testing launching iperf(old) with window size "x" and iperf(new) with window size "x" instead of producing the same or very close results produce totally different results. The only difference I see is the old compiled as win32 threads vs. pthreads but parallelism (-P 10) appears to work in both. Anyone has a clue or can recommend a tool that gives results I can trust?? EDIT: Looking at traces from (old) iperf it sets the TCP Window Scale flag to 3 in the SYN packet, when I run the (new) iperf this is set to 0 in the initial packet. A quick analysis of the window size through the exchange shows the (old) iperf moving back and forth but mostly at 32k while the (new) iperf mostly keeps at 64k. Maybe it will help somebody to connect the dots.

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• How to merge arbitrary snapshot into base vdi in Virtualbox

  - by jmathew

  I botched a transfer of a VM from one harddisk to the other. Now I'm left with the base vdi and a whole bunch of snapshots. My steps Copied old VM directory over to new HDD Deleted old VM and added new VM using using Machine-add and providing the old XML file Couldn't add base vdi file due to conflict so changed the UUID of base vdi with VBOXMANGE.EXE internalcommands sethduuid <path/to/vdi> Attempt to rollback to a snapshot, but it seems the VM is looking for the snapshots on the old HDD (which is formatted and gone) This is the error (networked is the name): Failed to restore the snapshot networked of the virtual machine lfs. Could not open the medium 'H:\vm\ft.vdi'. VD: error VERR_PATH_NOT_FOUND opening image file 'H:\vm\ft.vdi' (VERR_PATH_NOT_FOUND). Result Code: E_FAIL (0x80004005) Component: Medium Interface: IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd} The old HDD was drive H: the new one is drive N: How can I modify the snapshots/VM to look in N:\vm\ft.vdi for the base vdi? I've already set the default settings in VirtualBox in general (default vm/vm snapshot location). Or if not that how can I merge the old snap shot with the base vdi given that the only things that have changed is the base vdi's UUID?

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• What is the oldest hardware still in production use? How is it kept running?

  - by sleske

  In the spirit of the question What is your oldest hardware that still works?, I'd like to ask: What is the oldest hardware you know that is still in production use? And what challenges did you (or someone else) face in keeping it running (scarce documentation, no support, no spare parts available...)? Most organizations will retire / upgrade software and hardware after 5-10 years, but sometimes old software is kept running on old boxes, because it "just works". I once worked at a client site that was running a critical piece of (in-house developed) business software on a single server running HP-UX. The server was old (ca. 12-13 years), but fortunately still running without problems; however, getting spares would have been very difficult, and since software installation was undocumented, any significant system changes or even new hardware might have caused significant downtime and data loss. We eventually managed to replace it, but this is not always possible. I also read that many organizations still run decade-old mainframe hardware, particularly for highly customized systems controlling industrial machines or power plants. Which old hardware have you encountered? How did you manage these challenges? Related question: http://serverfault.com/questions/82467/should-old-servers-be-retired

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• VirtualBox how to merge arbitrary snapshot into base vdi

  - by jmathew

  I botched a transfer of a VM from one harddisk to the other. Now I'm left with the base vdi and a whole bunch of snapshots. My steps Copied old VM directory over to new HDD Deleted old VM and added new VM using using Machine-add and providing the old XML file Couldn't add base vdi file due to conflict so changed the UUID of base vdi with VBOXMANGE.EXE internalcommands sethduuid Attempt to rollback to a snapshot, but it seems the VM is looking for the snapshots on the old HDD (which is formatted and gone) This is the error (networked is the name): Failed to restore the snapshot networked of the virtual machine lfs. Could not open the medium 'H:\vm\ft.vdi'. VD: error VERR_PATH_NOT_FOUND opening image file 'H:\vm\ft.vdi' (VERR_PATH_NOT_FOUND). Result Code: E_FAIL (0x80004005) Component: Medium Interface: IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd} The old HDD was drive H: the new one is drive N: How can I modify the snapshots/VM to look in N:\vm\ft.vdi for the base vdi? I've already set the default settings in VirtualBox in general (default vm/vm snapshot location). Or if not that how can I merge the old snap shot with the base vdi given that the only things that have changed is the base vdi's UUID? Thanks

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