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• Assembling Software RAID in Live CD for data recovery

  - by Maletor

  I need help recovering some data that's on my RAID which is on a LVM on my server running Ubuntu. What happened was I deleted the logical volume that controlled my swap space which was on a partition on drives sda2, sdb2, sdc2, and sdd2 in RAID1. This foobared my whole system for one reason or another. Booting leave me with grub rescue and an error saying that it is an unknown filesystem. When I boot to a live cd I can see my RAID arrays and I can even start them up. However, it doesn't appear to mount them anywhere so I can't see the data. I am in the live cd now and I have done sudo apt-get install mdadm lvm2 so it should be mounting them correctly. I just can't see why it wouldn't. Please any help is appreciated here. Here is some output. By the way, there are 3 RAIDs, 1) /boot 100mb RAID1, 2) swap 10gb RAID1, 3) root 990GB RAID5 ubuntu@ubuntu:~$ df -h Filesystem Size Used Avail Use% Mounted on aufs 124M 101M 18M 86% / none 2.0G 324K 2.0G 1% /dev /dev/sde1 2.0G 826M 1.2G 42% /cdrom /dev/loop0 667M 667M 0 100% /rofs none 2.0G 164K 2.0G 1% /dev/shm tmpfs 2.0G 28K 2.0G 1% /tmp none 2.0G 92K 2.0G 1% /var/run none 2.0G 0 2.0G 0% /var/lock none 2.0G 0 2.0G 0% /lib/init/rw /dev/md1 91M 73M 15M 84% /media/5ac3dbf1-a6c5-409c-96ae-edc6e27992c7 ubuntu@ubuntu:~$ cat /etc/fstab aufs / aufs rw 0 0 tmpfs /tmp tmpfs nosuid,nodev 0 0 /dev/sda2 swap swap defaults 0 0 /dev/sdb2 swap swap defaults 0 0 /dev/sdc2 swap swap defaults 0 0 /dev/sdd2 swap swap defaults 0 0

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• Why is there an extra HDD under /dev being added in my Linux Kernel?

  - by user1279156

  I have created a Linux kernel and for some reason an extra drive is always added at bootup. My hard drive is listed as /dev/sdb. /dev/sda is created too, and it is 8 MB in size. I can't find anything in the kernel config that is creating this, but if I use a different kernel it is not there. Kernel logs show it as an attached SCSI device, looks just like my hard drive but only 8 MB, and has no partition table. It also doesn't appear to be a physical device. I've tried the kernel on many different models of PCs and it is always there. Does anyone know how to remove it? /dev/disk/by-id gives me: scsi-1AMCC_U21413034D98EB000584 scsi-1AMCC_U21413034D98EB000584-part1 scsi-353333330000007d0 scsi-SATA_ST3250312AS_5VY7SH42 scsi-SATA_WDC_WD800JD-60L_WD-WMAM9Y085675 scsi-SATA_WDC_WD800JD-60L_WD-WMAM9Y085675-part1 scsi-SATA_WDC_WD800JD-60L_WD-WMAM9Y085675-part2 hdparm -i /dev/sda gives me an "invalid argument". dd if=/dev/sda of=sda.img the resulting file does not have any content sdparm results: /dev/sda: Linux scsi_debug 0004 Device identification VPD page: Addressed logical unit: designator type: T10 vendor identification, code set: ASCII vendor id: Linux vendor specific: scsi_debug 2000 designator type: NAA, code set: Binary 0x53333330000007d0 Target port: designator type: Relative target port, code set: Binary transport: Serial Attached SCSI (SAS) Relative target port: 0x1 designator type: NAA, code set: Binary transport: Serial Attached SCSI (SAS) 0x52222220000007ce designator type: Target port group, code set: Binary transport: Serial Attached SCSI (SAS) Target port group: 0x100 Target device that contains addressed lu: designator type: NAA, code set: Binary transport: Serial Attached SCSI (SAS) 0x52222220000007cd designator type: SCSI name string, code set: UTF-8 transport: Serial Attached SCSI (SAS) SCSI name string: naa.52222220000007CD

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• initrd problem and Kernel panics after openSUSE 11.2 upgrade.

  - by unixbhaskar

  Once I have done the upgrade form openSUSE11.1 to openSUSE11.2 by doing this: zypper dup Now I tried to boot the system and it failed sync with VFS and kernel panic, so clearly a initrd problem . if I'm not mistaken. Now a bit of explanation about the problem: while upgrading it shows me the error updating initramfs( I forgot the exact error or might be warning).Oh yeah it shows some grub warning too. I have had been doing that from a chroot environment.. with all the required file mounted in proper place in the chroot environment. Now .after bit googling and painfully looking the susegeek.com forum and opensuse.org forum I have decided to recreate the initrd ...but the fellow called "mkinitrd" is real real crap as I hev been pointed out by few forum members. I tried to make an initrd image by myself, failed to do so .as it shows error that device not found( if I boot into suse live cd and mount the partition ) then I tried from the chrooted env and it says "there is no space left on the device" A bit bemused :( yeah most of you pointed it right may lack of knowledge of mine. Kindly suggest me and show me steps to do it correctly and get opensuse11.2 up and running. TIA

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• Drive letter not appearing after heat-related crash

  - by NickAldwin

  I recently had my old PC (has 3 physical hard drives partitioned into 6 partitions) off while on vacation. When I came back, I turned it on. I hadn't realized the room was warmer than it usually is due to hot weather while I was away. The computer was extremely slow to start up, then it crashed. When i rebooted, it got halfway through chkdsk on one of the non-system partitions, then crashed again. I opened it up and felt the hard drives and immediately shut down the computer and moved it to my basement to cool down because it was so hot. I left it there for a length of time while I reinstalled the A/C. I have now turned it on again. It is working fine, and every drive except for the one with the partition that was being checked has appeared in Windows. I scheduled chkdsk for all of the other partitions anyway, just in case, but I'm worried about that drive. I'm pretty sure the drive itself hasn't broken but that crashing in the middle of a chkdsk repair may have corrupted the data. What would you do in this situation? Most of the data on that drive was backed up, so it's not a huge deal if I lost it, but I'd like to get it back if I could. I also would love to regain usability of the drive, even if I have to wipe it -- but that's a last-resort sort of thing. What do you suggest I do?

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• Ubuntu inside VirtualBox is slow

  - by Kapsh

  I am running an Ubuntu instance on VirtualBox inside XP. Here are the details: Host: Windows XP Pro Guest: Ubuntu 8.10 Total RAM: 3GB RAM For VM: 1GB Total Video Memory: 128MB Video Memory for VM: 40MB Hard Drive: 200GB Hard Drive for VM: 30GB Processor: 2.80GHz Core Duo The problem is that whenever I am inside the virtual machine, things seem so much slower in general. For example Firefox, Eclipse take longer to load, dragging windows show a lag etc. I have tried running Ubuntu before (not inside a VM) and it seemed fantastically fast. So I am disappointed to have to deal with this situation. But I need access to the XP partition without having to reboot and hence the attempt. I am surprised with the perceived slowness since the whole world seems to be doing virtualization and I cannot imagine everyone works on slow systems knowingly. My question is - is there something I should be doing to boost performance? Am I doing something wrong? This is my home machine and I am not sure if this is the right forum to ask. Thanks.

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• Oracle Linux screen freezes during installation

  - by Fearless

  I was installing Oracle Linux 6.4 on a server, and the screen suddenly froze. Here were the previous steps: I put in the disk, clicked install, checked the disk (no errors), did pre-install setup (clock, root password, host+domain name, etc.), configured two 40GB hard drives in a RAID1 array (no swap, 3100mb encrypted raid partitions, ~100mb ext4 partition mounting to /boot, encrypted ext4 RAID device with mounting to /), selected packages, hit continue. The system did its short preinstall processes, then when to the main installation screen with the long status bar. The installer proceeded like always, but around package 250 out of ~1000, the screen suddenly went black with a text cursor in the upper left corner of the screen and the mouse cursor in its previous place. Neither cursor moved and the only thing that triggered a response was a ctrl-alt-delete that rebooted it. I have run this in VMs before without this issue. Memtest hasn't reported anything, and the media check went smoothly. The machine has supported Ubuntu server without issues before. Any ideas? I have tried booting after that, but the grub bootloader tries to find fd0 for some reason (I have no idea why it would search for the floppy disk). UPDATE My server successfully installed, but won't boot up. I think that, for some reason, it is still using the old bootloader from the previous installation. Any ideas on how to fix that?

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• How can I extract data from Toshiba Satellite with a dead Windows installation?

  - by msanford

  I've got a Toshiba Satellite (unknown model number but bought early 2010) running Windows Vista which throws a kernel error on boot. We don't have the restore/recovery CD any more to restore the Windows partition. I have managed to boot to a Live CD version of Ubuntu 10.10 and have mounted the internal hard drive (which takes nearly 8 minutes). I suspect that the hard drive is malfunctioning, however, because copy tasks of even 30 megs of data to an attached and mounted USB flash drive takes over an hour, and some files are mysteriously inaccessible (not a permissions issue). When browsing folders, it takes many minutes to populate the folder window even with a single tiny file. During the copy tasks, the hard disk sounds like it tries to sleep several times in rapid succession, then continues accessing, it sounds, at full throughput. I initially tried using scp (from the shell) to copy data but I encountered the same local problems. I don't know the S.M.A.R.T. status of the hard disk, either. Is there a more effective way of going about recovering the data on the internal disk, assuming that I can't use a recovery CD and am too cheap to bring it in (for now, at least)?

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• saving data from a failing drive

  - by intuited

  An external 3½" HDD seems to be in danger of failing — it's making ticking sounds when idle. I've acquired a replacement drive, and want to know the best strategy to get the data off of the dubious drive with the best chance of saving as much as possible. There are some directories that are more important than others. However, I'm guessing that picking and choosing directories is going to reduce my chances of saving the whole thing. I would also have to mount it, dump a file listing, and then unmount it in order to be able to effectively prioritize directories. Adding in the fact that it's time-consuming to do this, I'm leaning away from this approach. I've considered just using dd, but I'm not sure how it would handle read errors or other problems that might prevent only certain parts of the data from being rescued, or which could be overcome with some retries, but not so many that they endanger other parts of the drive from being saved. I guess ideally it would do a single pass to get as much as possible and then go back to retry anything that was missed due to errors. Is it possible that copying more slowly — e.g. pausing every x MB/GB — would be better than just running the operation full tilt, for example to avoid any overheating issues? For the "where is your backup" crowd: this actually is my backup drive, but it also contains some non-critical and bulky stuff, like music, that aren't backups, i.e. aren't backed up. The drive has not exhibited any clear signs of failure other than this somewhat ominous sound. I did have to fsck a few errors recently — orphaned inodes, incorrect free blocks/inodes counts, inode bitmap differences, zero dtime on deleted inodes; about 20 errors in all. The filesystem of the partition is ext3.

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• mysqldump --where with = operator doesn't get all rows = - Help!

  - by JonathanLIVE

  I have a situation with a particular table that now thinks it contains 4 Petabytes of data. I know that sounds cool, but I assure you, it is only on a 60GB partition. This table has 9 fields in it. One of them is a domain_id field. It is the best field to identify the rows by, as there are only approximately 6300 of them. The only other field option to match has over 2million records, and thats just more difficult. I cannot do a straight mysqldump because it will attempt to output all 4PB of data and fill the drive long before it gets close to that, so I need to surgically remove the good stuff, destroy the db, and recreate it. I believe if I can do a dump for each domain_id record, then I will get most of the usable data out of it. This is what I am trying to use: mysqldump -u root --skip-opt -q --no-create-info --skip-add-drop-table --max_allowed_packet=1000000000 database table --where="domain_id=10" domains10.sql Using this I expect every row with the domain_id 10 to be exported. However, when I check the export, I am only getting 1 row, when however I look at the db, there are many many rows. It is as though the operator just finds one, then gives up. I have tried various operators. Using the < or I am able to get more of the data, but the export stops short at certain rows where the data has been compromised. With over 6000 to go through, I can't narrow down which rows are being affected in the export easily enough. So, what I need is an operator that will basically do what I thought = would do, simply give me an export of all records that match the specific field. Also note, the only way I got this DB even accessible is through an innodb force recovery 3. So I need to get this right, because after this is done, I have to drop the db in order to make mysql functional again. Looking forward to any helpful answers.

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• How to fix missing RAID1 drive

  - by Sodved

  I had to do some fiddling about with my cables inside thebox and now I am getting a "Critical Error" about the RAID disks during startup. I have a gigabyte GA-MA770T-UD3 motherboard. Aparently the RAID controller is an AMD SB710 chip. I'm pretty sure I know what happenned. The first time I rebooted I had forgotten the power cable on one of the disks in the RAID1 (mirror) and let it boot up. So I shut down and put the power back in. So now when it boots up I go into the RAID admin interface (between the BIOS screen and the OS loading): it shows the RAID1 as in error the logical device has one disk and says the other is disconnected or missing the other physical disk shows up as a single disk If I boot to the OS (Windows 7 32 bit) the data all seems to be there. If I go into computer management it says my partition is on a disk and working OK. But the other disk is offline because: "The disk is offline because it has a signature collision with another disk that is online" So I am guessing because I STUPIDLY booted up with only one of the disks powered on, the other disk fell out of synch with the mirror and so now cannot rejoin the mirror. How do I fix this? I want to get the RAID1 mirror working again. There does not appear to be any "Repair" option in the basic RAID admin tool which I get into during startup before the OS boots. I have not made any explicit changes to the online one (but I guess the OS has probably written some admin data).

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• Did Adobe Photoshop just killed my Graphics Card for good?

  - by user6004

  I was working with Adobe Photoshop, just some regular work, when I came to edit a PSD file and change the text of some layer, when all of a sudden the PC froze. No mouse, screen is frozen, keyboard strokes aren't getting me anything, no Task Manager, nada. So I rebooted my PC, and then something quite terrifying appeared before my eyes. It was not the Checkdisk utility that was launched, that made me terrified (by the way, that reboot damaged the partition table of an external HDD that was connected at the time to my PC, but that's another story). It was the screen itself. Please have a look. So after Checkdisk finished and Windows loaded, I noticed that the resolution was not right. Instead of 1440x900 which I had set, it was 1280x1024. When I went to change it back, I had no option to change back to my old resolution, and has only 3 other general resolution properties, as if my Video Card (GeForce 8800 GTS btw) was not recognized. And what do you know, in the Device Manager it appeared with an exclamation mark. Inside the hardware, it said this: Windows has stopped this device because it has reported problems. (Code 43) Uninstalling the drivers, downloading the newest drivers from NVIDIA and installing them did not work. It always comes back to this. So, do you have any advice before I go out and buy a new graphics card? I thought this was the only option left, but maybe the experts at Super User can help me out. By the way, the dotted screen appears after every reboot, and I see the dots when the ASUS Motherboard screen shows up at boot. Thanks in advance.

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• How do I re-configure grub options

  - by Ash

  I've searched this topic and I can't find an article with a plausable solution, to my problem. I installed windows 7 first, with 100gb of disk space. I created the necessary partitions via windows. Then I installed Ubuntu 12.04 on the remaining 400gb of disk space. During the Ubuntu installation I installed the ubuntu boot loader on /dev/sda3 which Windows (as expected never granted me the option pre-boot for which OS I wanted to boot). So I re-installed Ubuntu on that /dev/sda3 partition, overriding the windows 7 loader. Now when I boot windows 7, it runs GNU Grub, so like an infinite loop. How can I reconfigure grub to say: /dev/sda is the bootloader. /dev/sda2 is Windows. /dev/sda3 is Ubuntu. Re-installing windows and my partitions isn't an option, purchasing software for windows isn't an option (theres a reason I use linux, it's not because it's free, because you don't have to install lots of shit to get stuff working, and over-all it's a robust OS).

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• Linux Has Become Very Slow Dealing With Large Data

  - by Kohjah Breese

  Last year I bought a computer, for around $1,800, so it is relatively high-end. When I first got it I was particularly pleased at how quick it dealt with large MySQL queries, imports and exports. But somewhere along the way something has gone wrong and I am not sure how to diagnose the problem. Any job that involves processing large amounts of data, e.g. gzipping file c. 1GB+, UPDATEs on large MySQL tables etc. have become very slow. I just performed an intensive alter statement on a 240,000,000 row table on a remote server, which is lower spec. This took about 10 minutes. However, performing the same query on a 167,000,000 row table on my computer went fine until it hit 860MB. Now it is only writing about 1MB every 15 seconds. Does anyone have any advice as to debugging what the issue is? I am using LinuxMint (based on Ubuntu 12.04.) The home partition is encrypted, which really slows down gzip. I have noticed the swap is barely used, but am not sure if that is because there is more than enough RAM. The filesystem is ext4. The MySQL server is on a separate hard drive, but it was fine when I first installed it. Other than the above issues, there are no other problems with it. I am going to install a fresh Ubuntu on the 4th hard drive to see if that is any different.

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• SQL Server 2005 Disk Configuration: Single RAID 1+0 or multiple RAID 1+0s?

  - by mfredrickson

  Assuming that the workload for the SQL Server is just a normal OLTP database, and that there are a total of 20 disks available, which configuration would make more sense? A single RAID 1+0, containing all 20 disks. This physical volume would contain both the data files and the transaction log files, but two logical drives would be created from this RAID: one for the data files and one for the log files. Or... Two RAID 1+0s, each containing 10 disks. One physical volume would contain the data files, and the other would contain the log files. The reason for this question is due to a disagreement between me (SQL Developer) and a co-worker (DBA). For every configuration that I've done, or seen others do, the data files and transaction log files were separated at the physical level, and were placed on separate RAIDs. However, my co-workers argument is that by placing all the disks into a single RAID 1+0, then any IO that is done by the server is potentially shared between all 20 disks, instead of just 10 disks in my suggested configuration. Conceptually, his argument makes sense to me. Also, I've found some information from Microsoft that seems to supports his position. http://technet.microsoft.com/en-us/library/cc966414.aspx In the section titled "3. RAID10 Configuration", showing a configuration in which all 20 disks are allocated to a single RAID 1+0, it states: In this scenario, the I/O parallelism can be used to its fullest by all partitions. Therefore, distribution of I/O workload is among 20 physical spindles instead of four at the partition level. But... every other configuration I've seen suggests physically separating the data and log files onto separate RAIDs. Everything I've found here on Server Fault suggests the same. I understand that a log files will be write heavy, and that data files will be a combination of reads and writes, but does this require that the files be placed onto separate RAIDs instead of a single RAID?

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• Windows 7 clean install becomes corrupt after reboot (repeated many fresh installs)

  - by pjotr_dolphin

  My laptop keeps crashing on boot after clean Windows 7 install. Ok, here is the story, and some fact. Computer: Samsung NP900X3C-A04HK (256GB SSD, 8GB RAM) OS to install: Windows 7 Ultimate SP1 (not from Samsung, own fresh Win) I purchased this laptop about a year ago, never booted it into the Windows Home that was installed on it, installed directly Ubuntu on the machine. Full disc encryption was the selected install, so of course it wiped the complete disc (including Samsung Recovery Partition). After some time, I felt like going back to Windows, as Windows 7 is actually quite nice. So I went to buy a fresh Windows 7Ultimate with SP1. Now to the tricky part. Windows installs perfectly, and after installing all Windows updates, drivers from Samsung, software I need, it is time for shutting it down and go to bed. Starting it up again, and it is not booting, these are the type of errors I have gotten so far (fresh installed it more then a dozen times now, and tried different suggestions from threads on the net). Windows failed to start... Status: 0xc000000f Info: The boot selection failed because a required device is inaccessible. File: /boot/bcd Status: 0xc000000f Info: an error occurred while attempting to read the boot configuration data. And some other errors, not all the same. Not memory of this. I have run different disc checks, and all says my SSD is in perfect shape. Note: Soft reboots from Windows menu works, never gets corrupted. But if I Shutdown and then start it up again, this is when it happens. Can someone help me not get back to Ubunut? What can be the cause, and how can it be fixed so I do not get there problems again?

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• Is it possible (and how if it is) dump two concatenaded disks in a new disk using DD?

  - by pedromarce

  Hi, I have a Lacie enclosure that has a setup with 2 500gb disks configured as 1 drive of 1TB, the only partition created for the whole drive is HFS+ journaled, but the controller in the enclosure is gone and so the drive refuses to mount anymore. I have been able to remove those two disks from the enclosure and connect them using USB ports and a program called R-studio (Raid recovery program) check that the setup the controller in the enclosure was using was both disks concatenated (Not Striped). And so configuring that option in R-studio I could be able to get back all the information. But before I got a license for r-studio for just one use, I would rather buying a new 1TB disk and try to write all the information of those two disks in this new one. I can use Mac or linux machines to do it, and I think it should be ok use DD command in linux to concatenate those two drives into the new one in the right order to get it working again in the new disk and I will reformat the old ones, but I am not sure. So, is it possible in this scenario to write both disks into a new one using DD? Any hints how the command would look? Thanks,

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• 'Microsoft.Practices.EnterpriseLibrary.Caching.CacheFactory' threw an exception

  - by user281180

  Hi I`m having the error message: The type initializer for 'Microsoft.Practices.EnterpriseLibrary.Caching.CacheFactory' threw an exception. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Practices.ObjectBuilder2, Version=2.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. Source Error: Line 30: private static ICacheManager GetCacheManager() Line 31: { Line 32: return CacheFactory.GetCacheManager(cacheManagerName); Line 33: } Line 34: } Source File: C:\Dev\DEV\HotHouse\HotHousetest3_rtmClone107\Code\MvcUI\State\PersistentCache.cs Line: 32 Assembly Load Trace: The following information can be helpful to determine why the assembly 'Microsoft.Practices.ObjectBuilder2, Version=2.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded. , whereas my colleages using the same dll, are not having the error message. Help please. I have Microsoft.Practices.EnterpriseLibrary.Caching and Microsoft.Practices.EnterpriseLibrary.Common as references both version 4.1.0.0 and runtime version v2.0.50727.

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• Missing Edit Option on Silverlight 4 DataForm

  - by rip

  I’m trying out the Silverlight 4 beta DataForm control. I don’t seem to be able to get the edit and paging options at the top of the control like I’ve seen in Silverlight 3 examples. Has something changed or am I doing something wrong? Here’s my code: <UserControl x:Class="SilverlightApplication7.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400" xmlns:dataFormToolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.DataForm.Toolkit"> <Grid x:Name="LayoutRoot" Background="White"> <dataFormToolkit:DataForm HorizontalAlignment="Left" Margin="10" Name="myDataForm" VerticalAlignment="Top" /> </Grid> </UserControl> public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(MainPage_Loaded); } void MainPage_Loaded(object sender, RoutedEventArgs e) { Movie movie = new Movie(); myDataForm.CurrentItem = movie; } public enum Genres { Comedy, Fantasy, Drama, Thriller } public class Movie { public int MovieID { get; set; } public string Name { get; set; } public int Year { get; set; } public DateTime AddedOn { get; set; } public string Producer { get; set; } public Genres Genre { get; set; } } }

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• Detect user logout / shutdown in Python / GTK under Linux

  - by Ivo Wetzel

  OK this is presumably a hard one, I've got an pyGTK application that has random crashes due to X Window errors that I can't catch/control. So I created a wrapper that restarts the app as soon as it detects a crash, now comes the problem, when the user logs out or shuts down the system, the app exits with status 1. But on some X errors it does so too. So I tried literally anything to catch the shutdown/logout, with no success, here's what I've tried: import pygtk import gtk import sys class Test(gtk.Window): def delete_event(self, widget, event, data=None): open("delete_event", "wb") def destroy_event(self, widget, data=None): open("destroy_event", "wb") def destroy_event2(self, widget, event, data=None): open("destroy_event2", "wb") def __init__(self): gtk.Window.__init__(self, gtk.WINDOW_TOPLEVEL) self.show() self.connect("delete_event", self.delete_event) self.connect("destroy", self.destroy_event) self.connect("destroy-event", self.destroy_event2) def foo(): open("add_event", "wb") def ex(): open("sys_event", "wb") from signal import * def clean(sig): f = open("sig_event", "wb") f.write(str(sig)) f.close() exit(0) for sig in (SIGABRT, SIGILL, SIGINT, SIGSEGV, SIGTERM): signal(sig, lambda *args: clean(sig)) def at(): open("at_event", "wb") import atexit atexit.register(at) f = Test() sys.exitfunc = ex gtk.quit_add(gtk.main_level(), foo) gtk.main() open("exit_event", "wb") Not one of these succeeds, is there any low level way to detect the system shutdown? Google didn't find anything related to that. I guess there must be a way, am I right? :/

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• bulk insert and update with ADO.NET Entity Framework

  - by Keith Barrows

  I am writing a small application that does a lot of feed processing. I want to use LINQ EF for this as speed is not an issue, it is a single user app and, in the end, will only be used once a month. My questions revolves around the best way to do bulk inserts using LINQ EF. After parsing the incoming data stream I end up with a List of values. Since the end user may end up trying to import some duplicate data I would like to "clean" the data during insert rather than reading all the records, doing a for loop, rejecting records, then finally importing the remainder. This is what I am currently doing: DateTime minDate = dataTransferObject.Min(c => c.DoorOpen); DateTime maxDate = dataTransferObject.Max(c => c.DoorOpen); using (LabUseEntities myEntities = new LabUseEntities()) { var recCheck = myEntities.ImportDoorAccess.Where(a => a.DoorOpen >= minDate && a.DoorOpen <= maxDate).ToList(); if (recCheck.Count > 0) { foreach (ImportDoorAccess ida in recCheck) { DoorAudit da = dataTransferObject.Where(a => a.DoorOpen == ida.DoorOpen && a.CardNumber == ida.CardNumber).First(); if (da != null) da.DoInsert = false; } } ImportDoorAccess newIDA; foreach (DoorAudit newDoorAudit in dataTransferObject) { if (newDoorAudit.DoInsert) { newIDA = new ImportDoorAccess { CardNumber = newDoorAudit.CardNumber, Door = newDoorAudit.Door, DoorOpen = newDoorAudit.DoorOpen, Imported = newDoorAudit.Imported, RawData = newDoorAudit.RawData, UserName = newDoorAudit.UserName }; myEntities.AddToImportDoorAccess(newIDA); } } myEntities.SaveChanges(); } I am also getting this error: System.Data.UpdateException was unhandled Message="Unable to update the EntitySet 'ImportDoorAccess' because it has a DefiningQuery and no element exists in the element to support the current operation." Source="System.Data.SqlServerCe.Entity" What am I doing wrong? Any pointers are welcome.

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• Mutual SSL Client Authentication

  - by nordisk

  Hi, I'm trying to achieve mutual SSL client authentication but without much success so far. Let me explain my scenario first: I have a client certificate issued by an intermediate CA whose certificate in turn was issued by a root CA (the intermediate and root CAs are within the company's network). This is the certificate I am including as part of my call to the server (using the HttpWebRequest object). The server has imported my client certificate and it is one of the certificates presented to me. An important thing to note is that the server does not trust the intermediate CA or the root for that matter. What we're trying to achieve is authentication against the certificate directly, i.e. mutual authentication using my client certificate. The error I'm getting is: "The request was aborted: Could not create SSL/TLS secure channel." From my trace logs I also get the following: System.Net Information: 0 : [3380] SecureChannel#34868631 - We have user-provided certificates. The server has specified 2 issuer(s). Looking for certificates that match any of the issuers. System.Net Information: 0 : [3380] SecureChannel#34868631 - Left with 0 client certificates to choose from. One of the certificates presented to us from the server is the same as our client certificate but the matching between them seems to fail. It looks like it's trying to verify the issuer. Now to make things even more interesting: If the server trusts and sends back the intermediate CA then everything works fine! (This is not an option for the production environment though I'm told) Using jmeter to test the request works fine too. I can only assume that Java's SSL handshake implementation is somewhat different. So it really comes down to this: Do you need to implement mutual SSL authentication differently from normal client SSL authentication? Any ideas or comments would be greatly appreciated.

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• SSH / SFTP connection issue using Tamir.SharpSsh

  - by jinsungy

  This is my code to connect and send a file to a remote SFTP server. public static void SendDocument(string fileName, string host, string remoteFile, string user, string password) { Scp scp = new Scp(); scp.OnConnecting += new FileTansferEvent(scp_OnConnecting); scp.OnStart += new FileTansferEvent(scp_OnProgress); scp.OnEnd += new FileTansferEvent(scp_OnEnd); scp.OnProgress += new FileTansferEvent(scp_OnProgress); try { scp.To(fileName, host, remoteFile, user, password); } catch (Exception e) { throw e; } } I can successfully connect, send and receive files using CoreFTP. Thus, the issue is not with the server. When I run the above code, the process seems to stop at the scp.To method. It just hangs indefinitely. Anyone know what might my problem be? Maybe it has something to do with adding the key to the a SSH Cache? If so, how would I go about this? EDIT: I inspected the packets using wireshark and discovered that my computer is not executing the Diffie-Hellman Key Exchange Init. This must be the issue. EDIT: I ended up using the following code. Note, the StrictHostKeyChecking was turned off to make things easier. JSch jsch = new JSch(); jsch.setKnownHosts(host); Session session = jsch.getSession(user, host, 22); session.setPassword(password); System.Collections.Hashtable hashConfig = new System.Collections.Hashtable(); hashConfig.Add("StrictHostKeyChecking", "no"); session.setConfig(hashConfig); try { session.connect(); Channel channel = session.openChannel("sftp"); channel.connect(); ChannelSftp c = (ChannelSftp)channel; c.put(fileName, remoteFile); c.exit(); } catch (Exception e) { throw e; } Thanks.

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• COM Object Method Invoke Exception - Silverlight 4

  - by Adam Driscoll

  I'm trying to use the new AutomationFactory provided with Silverlight 4 to call a .NET COM class. .NET COM-Exposed Class: public class ObjectContainer { public bool GetObject([Out, MarshalAs((UnmanagedType.IUnknown)] out object obj) { obj = new SomeOtherObj(); return true; } } Silverlight Assembly: dynamic objectContainer; try { objectContainer = AutomationFactory.GetObject(ProgId); } catch { objectContainer = AutomationFactory.CreateObject(ProgId); } object obj; if (!objectContainer.GetObject(out obj)) { throw new Exception(); } When I call objectContainer.GetObject(out obj) an exception is thrown stating: Value does not fall within the expected range. at MS.Internal.ComAutomation.ComAutomationNative.CheckInvokeHResult(UInt32 hr, String memberName, String exceptionSource, String exceptionDescription, String exceptionHelpFile, UInt32 exceptionHelpContext) at MS.Internal.ComAutomation.ComAutomationNative.Invoke(Boolean tryInvoke, String memberName, ComAutomationInvokeType invokeType, ComAutomationInteropValue[] rgParams, IntPtr nativePeer, ComAutomationInteropValue& returnValue) at MS.Internal.ComAutomation.ComAutomationObject.InvokeImpl(Boolean tryInvoke, String name, ComAutomationInvokeType invokeType, Object& returnValue, Object[] args) at MS.Internal.ComAutomation.ComAutomationObject.Invoke(String name, ComAutomationInvokeType invokeType, Object[] args) at System.Runtime.InteropServices.Automation.AutomationMetaObjectProvider.TryInvokeMember(InvokeMemberBinder binder, Object[] args, Object& result) at System.Runtime.InteropServices.Automation.AutomationMetaObjectProviderBase.<.cctorb__4(Object obj, InvokeMemberBinder binder, Object[] args) at CallSite.Target(Closure , CallSite , Object , String , Object& ) at CallSite.Target(Closure , CallSite , Object , String , Object& ) at ApplicationModule.ObjectContainer.GetObject() Wha's the deal?

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• OutputStream is not available when a custom TextWriter is used.

  - by Pinu

  this is my function which converts pdf to png image, it's throwing an error on this line-- stream.WriteTo(Response.OutputStream); Is there some thing wrong?? protected void CreatePngFromPdf() { try { string PDFLocation = string.Format(@"\\XXXX\{0}\{1}\{2}.pdf", Yr, Loc.Substring(0, 4), Loc.Substring(4, 4)); Utilities.WebPDF.PDF WebPDF = new DocuvaultMVC.Utilities.WebPDF.PDF(); WebPDF.Credentials = new NetworkCredential(@"xyz", "xyz"); byte[] png = WebPDF.StreamPdfPageAsPngResize(PDFLocation,PageNumber, 612, 792); MemoryStream ms = new MemoryStream(png); MemoryStream stream = new MemoryStream(); int newWidth = 612; int newHeight = 792; System.Drawing.Image newImg = System.Drawing.Image.FromStream(ms); Bitmap temp = new Bitmap(newWidth, newHeight, newImg.PixelFormat); Graphics newImage = Graphics.FromImage(temp); newImage.DrawImage(newImg, 0, 0, newWidth, newHeight); newImg.Dispose(); temp.Save(stream, ImageFormat.Png); stream.WriteTo(Response.OutputStream); temp.Dispose(); stream.Dispose(); } catch (Exception ex) { Response.Write(ex.Message.ToString()); } }

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• CA2000 passing object reference to base constructor in C#

  - by Timothy

  I receive a warning when I run some code through Visual Studio's Code Analysis utility which I'm not sure how to resolve. Perhaps someone here has come across a similar issue, resolved it, and is willing to share their insight. I'm programming a custom-painted cell used in a DataGridView control. The code resembles: public class DataGridViewMyCustomColumn : DataGridViewColumn { public DataGridViewMyCustomColumn() : base(new DataGridViewMyCustomCell()) { } It generates the following warning: CA2000 : Microsoft.Reliability : In method 'DataGridViewMyCustomColumn.DataGridViewMyCustomColumn()' call System.IDisposable.Dispose on object 'new DataGridViewMyCustomCell()' before all references to it are out of scope. I understand it is warning me DataGridViewMyCustomCell (or a class that it inherits from) implements the IDisposable interface and the Dispose() method should be called to clean up any resources claimed by DataGridViewMyCustomCell when it is no longer. The examples I've seen on the internet suggest a using block to scope the lifetime of the object and have the system automatically dispose it, but base isn't recognized when moved into the body of the constructor so I can't write a using block around it... which I'm not sure I'd want to do anyway, since wouldn't that instruct the run time to free the object which could still be used later inside the base class? My question then, is the code okay as is? Or, how could it be refactored to resolve the warning? I don't want to suppress the warning unless it is truly appropriate to do so.

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