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• How do I easily repair a single unreadable block on a Linux disk?

  - by Nelson

  My Linux system has started throwing SMART errors in the syslog. I tracked it down and believe the problem is a single block on the disk. How do I go about easily getting the disk to reallocate that one block? I'd like to know what file got destroyed in the process. (I'm aware that if one block fails on a disk others are likely to follow; I have a good ongoing backup and just want to try to keep this disk working.) Searching the web leads to the Bad block HOWTO, which describes a manual process on an unmounted disk. It seems complicated and error-prone. Is there a tool to automate this process in Linux? My only other option is the manufacturer's diagnostic tool, but I presume that'll clobber the bad block without any reporting on what got destroyed. Worst case, it might be filesystem metadata. The disk in question is the primary system partition. Using ext3fs and LVM. Here's the error log from syslog and the relevant bit from smartctl. smartd[5226]: Device: /dev/hda, 1 Currently unreadable (pending) sectors Error 1 occurred at disk power-on lifetime: 17449 hours (727 days + 1 hours) ... Error: UNC at LBA = 0x00d39eee = 13868782 There's a full smartctl dump on pastebin.

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• Chroot jail of Nginx and php

  - by sqren

  I'm hosting multiple websites on one VPS, and want to chroot each website, eg. /chroot/website1 /chroot/website2 I'm using makejail, which is a highlevel tool, for creating the jails, and copying the libraries and dependencies. Easy peasy. Each website will need nginx, php and mysql. For php I'm using php5-fpm which actually supports chroot by configuration, however I'm not using this (maybe I should?) My question is which approach of the following three is the better: 1) Every website will have its own seperated instance of nginx, php and mysql. The downside is, that each webserver + php has to listen to a different port. I also need a "master" nginx web server in front of them, reverse proxying to the chrooted servers behind it. Probably most secure, but also most advanced. 2) I don't make any chroot jails manually. I setup one nginx web server, that proxies php requests to php-fpm, on different ports. I can have multiple php-fpm configurations each with is own chroot'ed folder. This is quite managable - however only php will be chrooted. Not the actual webserver. Is this secure enough. Also, I tried this option out, and it seems I will need to use TCP instead of sockets for connecting to MySQL. 3) You tell me ;) I'm quite new to chroot jailing, so please correct me if I'm wrong in my assumptions. I've been reading all the tutorials I could find, however, I find the market for chroot guides very scarce. Any help or inputs much appreciated!

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• Broken UAC, cant edit File/folders or change settings in user account

  - by Antoros

  It appears that UAC is broken cant move/delete some file/folders, when asked to use administrative right (and say yes) it shows the loading bar and then nothings gets moved/deleted, no error whatsoever opened control panel, user account and when i click on any option with the Shield (administrative rights) the mouse changes to loading and thengo back to normal, not opening any menu or showing any error Already done a sfc /scannow , no errors found Already used Microsoft's Fix it, reclycle bin broken and repaired, still the same error Used microsoftaccounts tool , this are the errors i got: Problem with microsoft account policy... <- this is the problem (didint fix) Trust this PC <- loop of redirections, cant get to trust this pc (only one with w8) Problems witht sytem registration : i think it is because of the soft system reset Some setting have sync turned off : i never configured anything to sync Rootcauses found and created logs : would like to know where the logs are saved... had to use a ".reg" file to change uac setting to never notify, thinking it would fix this, no, it stoped asking though, i can still open a cmd with Administrative rights, but cant access to UAC settings Accesed Administrator account (net user administrator /active:yes)and even with that account could change any settings so there it is, dont know what else to do in the moment (this pc broke with 8.1 update and was restored to factory configuration, it broke several drivers and kept most of the registry entries, i cant find the cause of this problem. other info: i tried to delete a file in a program folder and couldnt, downloaded unlocker to check first if it was permissions but no, it showed me a msg telling me that there wasnt any error, and if i would like to delete it, clicked on yes, and it did delete it, what amuses me is that i cant without this tool, not even using the feature that takes over ownership Edit: wow, in a not crappy pc chkdsk is fast, completed with no errors found : /

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• Enabling Hyper-V Integrated Services Time Sync Services versus Internet Time Synchronization

  - by cpuguru

  Should I deselect the "Synchronize with an Internet Time Server" checkbox under the VM's "Date and Time - Internet Time Settings" tab if the "Time Synchronization Service" for a Hyper-V-based Virtual Machine is enabled? One of the Integration Services that Hyper-V provides is the Time Synchronization Service, which can be enabled/disabled by going to a VM's Settings-Integration Services setting in the Management section. I believe this is checked by default. When you install a Windows Server 2008 OS in a VM on the Hyper-V server, it comes with the "Synchronize with an Internet Time Server" option set, pointing to "time.windows.com". I'd think that if the parent Hyper-V server is set to one time server, and the child VM is pointing to a different time server, there would be a momentary blip if the two are not spot on with their times when the synchronization services run. So the question is, which time sync service should I use? I'm assuming not both. And what is the advantage of one over the other? Note: This question assumes that the machines are not joined to a domain. If they were, the machines would also try to update their time against the domain controller with the primary domain controller role too, right? Thanks!

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• Commandline program to extract archives with automatic subdirectry detection

  - by ??????

  The title already says it. What I'm looking for is essentially the pure commandline counterpart to ark -ba <path> (on KDE), or file-roller -h <path> (on GNOME/Unity). Unfortunately, both ark and file-roller require X to be running. I'm aware that it is relatively simple to write a tool that detects archives based on their file extension, and then runs the appropiate program: #!/bin/bash if [[ -f "$1" ]] ; then case $1 in *.tar.bz2) tar xjvf $1 ;; *.tar.gz) tar xzvf $1 ;; *.bz2) bunzip2 $1 ;; *.rar) rar x $1 ;; *.gz) gunzip $1 ;; *.tar) tar xf $1 ;; *.tbz2) tar xjvf $1 ;; *.tgz) tar xzvf $1 ;; *.zip) unzip $1 ;; *.Z) uncompress $1 ;; *.7z) 7z x $1 ;; *) echo "'$1' cannot be extracted with this utility" ;; esac else echo "path '$1' does not exist or is not a file" fi However, that doesn't take care of subdirectory detection (and in fact, many extraction programs do not even supply such an option). So might there be a program that does exactly that? I wasn't sure whether or not to ask on askubuntu.com, because this question isn't really about Ubuntu, but rather about any Linux operating system. My apologies if this question does not fit in here.

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• EFI pxe network boot error

  - by Lee

  Asking this on both [serverfault][1] and [superuser][2]. When attempting to network boot RHEL 5.4 on an old ia64 machine I get the following error : ![alt text][3] So I've basically followed the tutorial here : [http://www-uxsup.csx.cam.ac.uk/pub/doc/suse/sles9/adminguide-sles9/ch04s03.html][4] DHCPD,TFTPD etc are already setup and working with standard x86 PXE clients. I've unpacked the boot.img file into /tftpboot/ia64/ and passed the path to the elilo.efi file via DHCP with the filename ""; option. Changing this filename generates a PXE file not found error (see below). So I assume that PXE has found the file... ![alt text][5] The only thing wrong I can find in the logs is : Jan 6 19:49:31 dhcphost in.tftpd[31379]: tftp: client does not accept options Any ideas? I'm sure I hit a problem like this a few years ago but I can't remember the fix :) Thanks in advance! Thanks in advance! [1]: http:// serverfault.com/questions/100188/ efi-pxe-network-boot-error [2]: http:// superuser.com/questions/92295/ efi-pxe-network-boot-error [3]: http:// i.imgur.com/Zx1Jy. png [4]: http:// www-uxsup.csx.cam.ac.uk/pub/doc/suse/sles9/adminguide-sles9/ch04s03.html [5]: http:// i.imgur.com/CEzGf. jpg

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• Broken Creative DTT3500 Digital

  - by djechelon

  Hello, many years ago I bought a Creative DTT3500 Digital surround speakers system. It's been a while since my home theatre started behaving strange. During the past 6 months, I have noticed that the amplifier needed some time before correctly playing digital audio. Until a couple of weeks ago, it needed up to 5 minutes of very noisy "warm up" before playing an "almost" clear audio. Today, I found that even using the analog input (completely disabling digital inputs) the noise persists. Powering off and on the speakers doesn't work. Now, it's reasonable that after almost 10 years, the amplifier got broken. My problem is that I can't simply replace the speakers with another kit from another brand, since 2 speakers in my room are placed in the back wall, with coaxial cables going under the floor but not completely inside a single tube. I mean, I have coaxial extension cables starting from the DTT3500 amplifier, going into the wall, then under the floor in a plastic cable tube, then exiting the tube (still under the floor), connecting to the male coaxial connector of the original cable supplied by Creative, and continuing up to the point close to my bed where the speakers are. I could replace the speakers **only as soon as the new speakers have the same coaxial to bi-polar cables that Creative ships with DTT3500 Another option might be "repairing the amplifier", but I don't know if it's feasible, what should I or a technician look for in the amplifier, and how much would it cost (is it worth to repair or buy a new kit considering the problem above? What do you suggest me to do, basing on the above observation? Thank you.

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• Computer specs for a large database

  - by SpeksETC

  What sort of computer specs (CPU, RAM, disk speed) should I use for running queries on a database of 200+ million records? The queries are for a research project, so there is only one "user" and only one query will be running at a time. I tried it on my own laptop with SQL Server with an i3 processor, 2GB RAM, 5400 RPM disk and a simple query didn't finish even after 8+ hours. I have an option to connect a SSD via eSata and upgrade to 4GB RAM, but not sure if this will be enough... Thanks! Edit: The database is about 25 GB and the indexes are not setup properly. When I tried to add an index, I let it run for about 8 hours and it still hadn't finished so I gave up. Should I have more patience :)? In general, the queries will run once in a while and its ok even if it takes a couple hours to complete.... Also, the queries will produce probably about 10 million records which I need to process using Stata/Matlab and I'm concerned that my current laptop is not strong enough, but unsure of the bottleneck....

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• How \Deleted flag can be unset for all mails in cyrus-imapd mailbox?

  - by Sachin Divekar

  I have a 5GB mailbox which I moved using imapsync. But somehow I messed up with --delete/--delete2 option and end up with almost all the messages having \Deleted flag set. I do not have delayed expunge enabled, so I can not use unexpunge utility. I am using cyrus-imapd v2.3.7. Using cyrus-imapd's debugging feature I found out that email client(Roundcube in my case) fires following IMAP command to unset it. UID STORE 179 -FLAGS.SILENT (\Deleted) I don't know if somehow I can fire this command for all the mails. Is there any way I can unset \Deleted flag for all the mails in the mailbox? UPDATE: Using @geekosaur's tip of specifying range of message-ids in the above command, I could solve it for one mailbox under INBOX like INBOX.folder1. Is there any way I can do it for multiple mailboxes under INBOX recursively? Now I am working on solving it using/creating some script, maybe using Perl's IMAP related module. But still I need to solve it asap so inputs are welcome.

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• Ripping a home video VCD on Linux or Windows with VLC or otherwise

  - by user259774

  I have a VCD with 22 minutes of video on it. I would like to retain this footage and throw away the VCD. I can play the whole thing with VLC ("open disc - vcd - /dev/sr0 - play"): all 22 minutes of the main track. I don't believe there's any other content aside from the main track. I can seek to anywhere I want to within the 22 minute track. If I mount /dev/sr0 /media/vcd and then try to copy the only file from the MPEGAV folder, I get an I/O error, with an empty destination file. VLC has a "convert" option in addition to "play". When I use this I actually get a good OGG file back, after it runs through the video in painful real-time. I guess it dubs it frame-by-frame. But the file is only 10 minutes long, leaving 12 minutes off of the track. Handbrake doesn't detect it's track titles, unfortunately. I don't know if I should start getting involved with GNU ddrescue or if it's because VCDs somehow encode their data sectors differently. Anyway, I'm in way over my head and if anyone knows how I could get that video track off the thing, feel free to share! Edit: I should note that I also have access to a Windows computer

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• Sql Server Management Studio: Change Prefix or Suffix characters

  - by PhantomDrummer

  I have an instance of SSMS 2008, for which the option to edit data in a table doesn't work. If I right-click on any table in the Object Explorer and select 'Edit top 200 rows' I get an error dialog 'Invalid prefix or suffix characters. (MS Visual Database Tools)'. The error seems to be associated specifically with SSMS, not with SQL Server (because this SSMS instance gives the same error no matter what database I connect to, but I've verified I can connect to some of the same databases using SSMS on other machines without the error). (However, our firewall prevents me using SSMS on other machines for some crucial tasks, so I do need to fix the problem). Googling for the error suggests that I should change the prefix, suffix or escape character, but without any indication of how you can make that change in SSMS. I'd also note that I'm not aware of having done any customization on SSMS since installing it, so would be surprised at having to make such a change now. Does anyone have any idea what the error message means or what I can do about it? Or how I can change the prefix/suffix/escape characters if that is really the problem.

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• Virtualbox Headless Server on Ubuntu missing VRDP Options

  - by The Daemons Advocate

  I'm running VirtualBox headless server on an Ubuntu 64 bit host, and I want to use it remotely. However, I'm having problems connecting via RDP. The DNS names in my network show the host to be 'server', and the guest to be 'ubuntu-vm'. From the official documentation, I gather that I am to connect to server on the default RDP port in order to see the guest machine. I start the virtual machine like so: vboxheadless -startvm My_VM Then I connect on my laptop, and I get... rdesktop -a 16 server ERROR: server: unable to connect So next I consult the documentation further, and I find there are RDP flags that can be turned on (but should be on implicitly for a headless server). So I pull up information using 'vboxmanage showvminfo My_VM', and I find the VRDP property is off. VRDP Connection: not active To make things even weirder, RDP flag seems to be missing from vboxmanage. I've installed straight from the ubuntu repo's using the virutalbox-ose package, not sure how that measures up against the official docs. For instance, this command doesn't exist: VBoxManage modifyvm My_VM --vrdp on From the UI, the VM's Settings regarding Display have greyed out the 'remote Display' option. What I'm looking for is advice :). I'm open to suggestions that don't involve starting again with something like VMWare. Thanks in advance!

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• Solaris TCP stack tuning

  - by disserman

  We have a large web project (about 2-3k requests per second), using haproxy (http://haproxy.1wt.eu/) as a frontend and load balancer between the java application servers. The frontend (haproxy) is running on Linux but we are going to migrate it to the Solaris 10 as all our other servers are running under Solaris. After switching a traffic I see the two things: a) the web site became loading slower (5-10 seconds with images in comparison to 2-3 seconds on Linux) b) sometimes haproxy fails to perform a "lifecheck" (get a special web page and analyze http response code) due to the socket timeout. After switching traffic back to Linux everything is okay. I've tried to tune all params I found in /dev/tcp but no progress. I believe the problem is in some open socket limitations. If someone can point me to the answer, I would be greatly appreciated. p.s. haproxy is running under Xen DomU on Linux (Kernel 2.6.18, Debian 5), under zone on Solaris (10 u8). the only thing we did on Linux is increasing of ip_conntrack_max (I believe Solaris option tcp_conn_req_max_q is the equivalent).

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• How do I host multiple independent, secured SharePoint sites (WSS 3.0) without using Active Director

  - by Kyle Noland

  I have a SharePoint site set up on one of my networks to service Active Directory users. To be clear, this is a Windows SharePoint Services 3.0 installation running on Windows Server 2003 Standard. It is not an option to upgrade the server or SharePoint version. Management would like to create several new sites, one for each of a handful of clients. These sites will be used like "dropboxes" or FTP sites so that my company can make large files available to outside contacts, and vice versa. Here are my requirements: I do not want to have to create Active Directory accounts for each external contact. If possible, I would like to store the external usernames and passwords in a database that I can write a small GUI for so that management can handle adding their own external contacts. Each client site must be sandboxed from each other and from my main company SharePoint site. I would like to keep everything running on port 80 and be able to access the sites as either clientname.mycompany.com or www.mycompany.com/clientname If anybody has ever done this I would really appreciate hearing about any lessons you learned and suggestions for how to set this up. Kyle

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• Using Virtualbox Bridge Networking fails connection from Guest OS to Oracle XE running on Host

  - by Licheng

  I am trying to make a JDBC connection from a VirtualBox Ubuntu Guest OS to an Oracle XE database running o Host. However, the connection is refused. Here are the details of my environment: VirtualBox: 4.1.4 Host OS: Windows 7 Guest OS: Ubuntu server 11.4 Networking mode: Bridged network Oracle XE database running on Host Issue: WebLogic server runs on the Ubuntu virtualbox. It attempts to connect to an Oracle XE database running on the Host OS (windows 7) with listening port 1521. On the Guest OS (Ubuntu), I am able to ping the Host computer from the Guest OS. However, when I configured a JDBC data source on the WebLogic server on the Guest OS to connect to the Oracle XE, connection took a long time, and eventually I received an "IO Exception: The Network Adapter could not establish the connection". When I tried "telnet host-ip 1521", no connection was established. With Bridge networking, I can make bi-directional connections between the host and the guest OS (e.g. connection through ssh and ftp). Is there anything I missed in the setup of Bridge networking and the guest/host OS? Note that I was able to make the same connection within a normal networking environment (i.e. not using virtual box). I am not sure whether Bridge networking is a good option for the work described above. Should I use host-only networking mode? If so, any specific configurations I need to perform? I read through the Virtual box document on setting up the host-only network, however, it lacks of details. I followed the procedures described in the manual, and couldn't even connect to the host. Could some experts here enlighten me on this issue? Much appreciated. Licheng

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• Installing SATA dvd burner on machine with no spare SATA ports/connectors

  - by Faheem Mitha

  Greetings. I have the following motherboard Tyan Thunder K8WE S2895A2NRF Motherboard - extended ATX - nForce Pro 2200/2050 - Socket 940 - UDMA133, Serial ATA-300 (RAID) - 2 x Gigabit Ethernet - FireWire - 6-1 channel audio This is part of a computer that was assembled in the winter of 2006/2007. The user manual says the following with regard to SATA Integrated SATAII Generation 1 Controllers (from NForce Professional 2200) Two integrated dual port SATA II controllers Four SATA connectors support up to four drives 3 Gb/s per direction per channel NvRAID v2.0 support Supports RAID 0, 1, 0+1 and JBOD. I just purchased a SATA DVD burner. Here is the page for the product http://www.amazon.ca/gp/product/B002QGDWLK/ The problem I am facing is that I already have 4 SATA drives installed. I don't want to remove any of them. However, I want the DVD burner above installed as well. The person I am consulting with here (Bombay, India) tells me that my four available SATA ports are filled, and that my only option is to install a SATA card into the one free PCI slot on the motherboard. However, he says that with this setup I will not be able to boot from the DVD drive. Are these statements correct, and what are my other options if any? Even it the statements in the last para are true, I suppose I could use one of the motherboard connectors/ports there are currently being used with the hard drives with the DVD drive, and use the "add-on" connector with one of the hard drives. Not all the 4 hard drives need to be bootable. BTW, despite having read through http://en.wikipedia.org/wiki/Serial_ATA#Cables.2C_connectors.2C_and_ports I am fuzzy on the differences between connectors, cables and ports. Thanks in advance.

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• Accessing network shares on Windows7 via SonicWall VPN client

  - by Jack Lloyd

  I'm running Windows7 x64 (fully patched) and the SonicWall 4.2.6.0305 client (64-bit, claims to support Windows7). I can login to the VPN and access network resources (eg SSH to a machine that lives behind the VPN). However I cannot seem to be able to access shared filesystems. Windows is refusing to do discovery on the VPN network. I suspect part of the problem is Windows persistently considers the VPN connection to be a 'public network'. Normally, you can open the network and sharing center and modify this setting, however it does not give me a choice for the VPN. So I did the expedient thing and turned on file sharing for public networks. I also disabled the Windows firewall for good measure. Still no luck. I can access the server directly by putting \\192.168.1.240 in the taskbar, which brings up the list of shares on the server. However, trying to open any of the shares simply tells me "Windows cannot access \\192.168.1.240\share You do not have permission to access ..."; it never asks for a domain password. I also tried Windows7 native VPN functionality - it couldn't successfully connect to the VPN at all. I suspect this is because SonicWall is using some obnoxious special/undocumented authentication system; I had similar problems trying to connect on Linux with the normal IPsec tools there. What magical invocation or control panel option am I missing that will let this work? Are there any reasonable debugging strategies? I'm feeling quite frustrated at Windows tendency to not give me much useful information that might let me understand what it is trying to do and what is going wrong.

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• multiple php compiler on single apache installation

  - by getmizanur

  elloo, i have some old php scripts which runs on php-5.2.x and the current server has php-5.3.x. to get around this problem,i have got two options one is to downgrade php-5.3.x or install php-5.2.x and php-5.3.x at the same time where php-5.2.x serve cgi script. i have decided go for the second option i have followed this tutorial and i can get most of it working however except execution of shell script which selects php-cgi version. i cannot get apache to execute this script. how do i get apache to execute #!/bin/sh # you can change the PHP version here. version="5.2.6" # php.ini file location, */php-5.2.6/lib equals */php-5.2.6/lib/php.ini. PHPRC=/etc/php/phpfarm/inst/php-${version}/lib/php.ini export PHPRC PHP_FCGI_CHILDREN=3 export PHP_FCGI_CHILDREN PHP_FCGI_MAX_REQUESTS=5000 export PHP_FCGI_MAX_REQUESTS # which php-cgi binary to execute exec /etc/php/phpfarm/inst/php-${version}/bin/php-cgi my apache vhost.conf <VirtualHost *:80> ServerName 526.localhost DocumentRoot /home/getmizanur/public_html/www <Directory "/home/getmizanur/public_html/www"> AddHandler php-cgi .php Action php-cgi /php-fcgi/php-cgi-5.2.6 </Directory> </VirtualHost> can some one tell me what am i doing wrong? thanks in advance. solution: if i did a2dismod php5 then the above configuration worked. when a2enmod php5 had been activated, apache was executing php5.3 instead of php5.2 even after telling apache to execute php5.2 shell script. to solve my problem, i had to change my virtualhost configuration <VirtualHost *:80> ServerName 526.localhost DocumentRoot /home/getmizanur/public_html/www DirectoryIndex index.php <Directory "/home/getmizanur/public_html/www"> AddHandler php-cgi .php Action php-cgi /php-fcgi/php-cgi-5.2.6 <FilesMatch "\.php"> SetHandler php-cgi </FilesMatch> </Directory> </VirtualHost> presto, it started working.

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• Retail windows xp prof sp 2 Lost key but have the genuine cd , what to do?

  - by AdityaGameProgrammer

  I had recently formatted my system only to find out i have lost the cd key to my original cd. i had used the option to enter the product key later. Yes, i know its a stupid thing to do but i bought the cd in 2008 from a retail store and i lost the original packaging. the actual label on the cd is includes service pack version 2002 .@2004 microsoft corporation reserved. There are some numbers on the back side of the cd in the inner ring. i cant for the life of me figure out how what is the use of the genuine cd i have with me when i cant seem to activate it. what exactly is the advantage of having the original cd in your possession in situations like this?. i have tried the unattend.txt and it doesnt contain the correct key. and there does not exist any winnnt.sif file in the cd. where on the cd or in it can i find the product id information i stay in india . and my attempts at trying the microsoft support site keeps getting me directed to page which says they had stopped support for windows xp in 2011. lets say by some miracle i do contact microsoft. what information would i have to provide them? and would they be giving me the product key for my cd key from their database? or a new key?

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• Backing up VMs to a tape drive

  - by Aljoscha Vollmerhaus

  I've got myself one of these fancy tape drives, HP LTO2 with 200/400 GB cartridges. The st driver reports it like this: scsi 1:0:0:0: Sequential-Access HP Ultrium 2-SCSI T65D I can store and retrieve files like a charm using tar, both tar cf /dev/st0 somedirectory and tar xf /dev/st0 work flawless. However, what I really would like to backup are LVM LVs. They contain entire virtual machines with varying partition layouts, so using mount and tar is not an option. I've tried using something like dd if=/dev/VG/LV bs=64k of=/dev/st0 to achieve this, but there seem to be various problems associated with this approach. Firstly, I would like to be able to store more than 1 LV on a single tape. Now I guess I could seek to concatenate the data on the tape, but I think this would not work very well in an automated scenario with many different LVs of various sizes. Secondly, I would like to store a small XML file along with the raw data that contains some information about the VM contained in the LV. I could dump everything to a directory and tar it up - not very desirable, I would have to set aside huge amounts of scratch space. Is there an easier way to achieve this? Thirdly, from googling around it seems like it would be wise to use something like mbuffer when writing to the tape, to prevent what wikipedia calls "shoe-shining" the tape. However, I can't get anything useful done with mbuffer. The mbuffer man page suggests this for writing to a tape device: mbuffer -t -m 10M -p 80 -f -o $TAPE So I've tried this: dd if=/dev/VG/LV | mbuffer -t -m 10M -p 80 -f -d 64k -o /dev/st0 Note the added "-d 64k" to account for the 64k block size of the tape. However, reading data back from a tape written in this way never seems to yield any useful results - dd has been running for ages now, and managed to transfer only 361M of data from the tape. What's wrong here?

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• Netcat (nc) traditional package for RHEL 6.x?

  - by HTTP500

  I'm trying to use the Percona Apache Monitoring [Cacti] Template for Memcached. They do indeed warn that you can't use the openbsd version of the package and provide a solution for Ubuntu/Debian users, i.e.: You need nc on the server. Some versions of nc accept different command-line options. You can change the options used by configuring the PHP script. If you don’t want to do this for some reason, then you can install a version of nc that conforms to the expectations coded in the script’s default configuration instead. On Debian/Ubuntu, netcat-openbsd does not work, so you need the netcat-traditional package, and you need to switch to /bin/nc.traditional... Since the RHEL 6.x version indeed comes from openbsd (confirmed by rpm -qi nc) how does one go about getting this installed on RHEL/CentOS? Anyone else running these Percona templates on RHEL/CentOS? What did you do? alien the Debian package? Update 1: FWIW, I tried to use GNU netcat by compiling it from source but it doesn't seem to have the exact options required by the Cacti template either (i.e. there is no analogy for -C or -q1 so it seems) Update 2: I alien[ed] the netcat-traditional_1.10-38_amd64.deb package to make a .tgz and it does produce a binary "nc.traditional" and that version has the -q option but no -C Cheers

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• VMware vSphere Hypervisor 5 with Intel SPL 5000 in Raid 0 no boot from DVD?

  - by Richard

  I hope this is the correct StackExchange, since I am only using StackOverflow for Web development, but need some help with my server configuration. I would like to install VMware vSphere Hypervisor 5 on my server here at home and run a view machines on it such as Windows Server 2008 and Red Hat. I used to have either OpenSuse or Windows Server 2008 installed but I would like to get into VMWare Hypervisor. My hardware configuration: - Intel S5000PSL with bios version S5000.86B.10.60.0091 build date 10/09/2008 as of read out of bios - E5420 @ 2.5GHz Intel Xeon CPU The Intel Virtualization Technology is enabled in the BIOS - DVD DH20A4P DVD Writer - 8GB ECC Ram I have configured a RAID 0 on my 2 WD 2TB SATA drives I have burned the Hypervisor 5 on an empty DVD and it is bootable, I tested it on my client PC. The main problem here is basically, that I cannot boot the DVD on my server. I have set the Boot Option to the DVD drive. I have booted from the BIOS straight in the DVD drive and it does not work. I do not see any error messages. The only thing I see are the PXE error messages when it tries booting from the network and other devices, obviously without any result. Does anybody know why I cannot boot the DVD? What could cause the problem? I have sucessfully installed Windows Server 2008 via original DVD about 1 year ago, so the DVD drive can read and does work. The DVD drive is available in the BIOS and I have checked all cables and none of them is loose in any way. I even see the light flashing but it does not want to boot from the DVD. I am looking forward to suggestions and things that I should check. Thank you very much

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• sql developer cannot establish connection to oracle db with listener running

  - by lostinthebits

  I am working from home and connected to my work's vpn. I have tried to connect to the work db with sql developer (the latest version and the previous version) on the following environments: mac os x 10.8.5 (with sql developer launched and installed directly on the iMac. sql developer launched and installed directly on a vm on same computer (guest Ubuntu 12.04 LTS) sql developer launched and installed directly on a vm on same computer (guest Windows 7.0 Professional) I get Status Failure Test Failed : IO Error - The Network Adapter could not establish the connection. I have read dba forums and googled and the most common suggestion is that the oracle listener is not up and running. I can conclusively say this is not the case because I have the option of using remote desktop and accessing the oracle db in question on my work computer. If the listener was down, according to my DBA, no one would be able to connect. My sysadmin and dba are stumped so I assume it is something unique to my home system. The reason I do not want to continue with the remote desktop workaround is because remote desktop has an annoying (infuriating often) lag.

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• Ripping CD Audio simultaneously from 2 drives on one PC via USB or PATA - rip accuracy preserved?

  - by Rob

  I'm considering ripping audio (reading audio) from CDs using 2 drives simultaneously to speed up the process of ripping the CDs - i.e. 2 at a time rather than 1. Are there any issues with achieving maximum rip accuracy? In general I wondered if people have tried this and if the simultaneous streams from both rip activities would overload the host machine and cause packet loss or read retries resulting in a sub-standard CD-DA Audio CD rip? If it just means the rip is slightly slower (but still faster than sequentially doing one rip followed by another) but still of maximum accuracy then that is OK for me. I will be using dbPowerAmp to rip the CDs and converting to FLAC lossless format. Specific examples: There are 2 machines I intend to do it on: A Toshiba NB100 1.6Ghz Atom netbook, 2Gb RAM, running Windows XP Home with 1 external LG DVD/CD burner and external 1 LG Blu-ray burner attached via USB 2.0, ripping to the machine's 5400rpm internal hard drive. This rips from one CD drive very well, more than adequate, it is a nippy, fast little machine for its specification. A Desktop PC running Windows 7 Home Premium with MSI P4M900M2-L/ MS-7255v2.0 motherboard and 1.86Ghz Intel Core 2 Duo E6320, 7200rpm hard drive and 2Gb RAM, with an internal LG PATA DVD/CD burner (master) and a Philips DVD/CD burner (slave) on the same PATA bus (perhaps separate buses would be another option to consider here). Thoughts?

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• Why won't Google Chrome install on my Windows 7?

  - by quakkels

  I can tell something is wrong with my computer. A little history: Google Chrome was not running correctly. When i was using facebook, any link on face that ran an ajax javascript function would not work. No error was being thrown, it just wasn't working. I uninstalled Chrome and reinstalled it. On re-install, a toolbar automatically installed with Chrome. BitTorrentBar. I did not install BitTorrentBar, it installed on it's own. Bad. When BitTorrentBar was active, then ajax functions on facebook worked. When I deactivated or uninstalled BittorrentBar from Chrome extensions, then ajax stopped working. I ran scanned the computer with Avast (free version) and SpyBot Search and Destroy (also free). They found nothing wrong. I uninstalled Chrome using Control Panel and then I went through my file system deleting anything that had "google", "BitTorrent", "chrome", or "conduit". Conduit seems to distribute BitTorrentBar. After doing all that, I tried to reinstall Chrome. I got this error: System.ComponentModel.Win32Exception: The system cannot find the file specified at System.Diagnostics.Process.StartWithShellExecuteEx(ProcessStartInfo startInfo) at System.Diagnostics.Process.Start() at System.Diagnostics.Process.Start(ProcessStartInfo startInfo) at ClickOnceBootStrap.ClickOnceEntry.Main() This error interupts the Chrome install every time! computer scans don't show anything wrong. So then, I thought this might be a .net framework error. Perhaps I deleted something I wasn't supposed to. So I reinstalled .NET Framework 4 and checked the repair option. I also ran Windows Updates. When I tried to download Chrome, again I got the same error as listed above. What should I do?

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