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  • What proportion of DBA skills are platform-independent?

    - by Arkaaito
    Problem: we've grown to the point where we need a real DBA. Real DBAs are hard to find. Possible solution: I know someone with extensive experience (currently working on MSSQL) who is looking for a new DBA job. He might be willing to consider working for a MySQL shop (I haven't asked). Snag: I don't know to what extent MSSQL DBA skills map to MySQL DBA skills. I'm a developer, so I know enough about MySQL to develop apps which use it (including the basic performance-tuning, index selection, etc.), do schema design, and perform simple utility tasks (backup with mysqldump, scripting, etc.). I don't know anything about MSSQL. Nor do I actually know much about the boundaries of the DBA role. Can anyone with more experience - perhaps as a DBA - weigh in on this? Are there enough similarities between MSSQL and MySQL that it's worth asking a MSSQL DBA if he'd be interested in applying for a MySQL position?

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  • Dell e4300 Random Beeps

    - by Mikey.B
    I’ve noticed that my Dell e4300 Laptop will randomly beep every now and then. The symptoms are virtually identical to the issue described here: http://en.community.dell.com/support-forums/laptop/f/3518/t/19314488.aspx Any ideas why? I thought it might be related to hard drive activity so I downloaded the western digital disk utility and all tests check out fine. It’s not a big deal and it only beeps once every few days. I just want to make sure there isn’t a larger problem looming. =) -M

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  • What backup solution for Windows 2008 R2 servers on XenServer 5.0?

    - by Niels R.
    A friend of mine is hosting a lot of Linux VM's on his servers using XenServer 5.0. He uses rdiff-backup to make daily backups. I'm trying to convince him to host some Windows VM's (Windows 2008 R2 Web Edition) too, so he could provide (me) .NET hosting. The main problem at the moment is a backup strategy for these Windows VM's. I would like to see something like a weekly full backup (snapshot of the VM?) with daily incrementals. I've looked at Windows Backup, but because the backups are made onto network shares it doesn't provide incrementals (for what I understand). Does anyone has any experience with this situation? How did you solve this in a "not-too-hard-to-install/maintain" way?

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  • CentOS vs. Ubuntu

    - by DLH
    I had a web server that ran Ubuntu, but the hard drive failed recently and everything was erased. I decided to try CentOS on the machine instead of Ubuntu, since it's based on Red Hat. That association meant a lot to me because Red Hat is a commercial server product and is officially supported by my server's manufacturer. However, after a few days I'm starting to miss Ubuntu. I have trouble finding some of the packages I want in the CentOS repositories, and the third-party packages I've tried have been a hassle to deal with. My question is, what are the advantages of using CentOS as a server over Ubuntu? CentOS is ostensibly designed for this purpose, but so far I would prefer to use a desktop edition of Ubuntu over CentOS. Are there any killer features of CentOS which make it a better server OS? Is there any reason I shouldn't switch back to Ubuntu Server or Xubuntu?

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  • Build a RAID-5 USB Array or NAS?

    - by TK Kocheran
    I'm looking to build a RAID-5 or RAID-6 hard disk array to be used as a centralized backup location for my home network. I have a lot of 4-8GB DVD ISO files which I intend to serve over the network to my TV using DLNA or something similar. I need decent write times, fast read times, and preferably a way to connect this array to my network router over USB. I'll probably be using ext3/4 on it (I'd use btrfs if my router supported it :-[). Is there a way to build a RAID array that is accessible over USB? I'm kind of new to this and most guides assume you're running a RAID array inside your machine. I need at least 5TB of space, and I need redundancy, so I prefer RAID-6. How can I go about accomplishing this?

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  • Fiber Channel Loop vs Point to Point

    - by RandomInsano
    So, I'm playing with a couple of QLogic QLA2340s connected directly together. I've got options here to either have them act as a loop, or in point to point mode. What's the difference if I'm only going to have two machines connected together? Is point-to-point more efficient? The firmware has an option to prefer loop, then fall back to p2p. Anyone have any idea if there are performance benefits or drawbacks? It's pretty hard to find that information.

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  • Linux Virtualization Options on EC2

    - by recampbell
    I need to subdivide EC2 (or perhaps other cloud provider) instances. I know you cannot run a full virtualization stack on another. For instance a Xen guest cannot host a VirtualBox guest. So this means I am left with operating system-level virtualization. EC2 kernels are only publishable by select vendors, so you cannot upload the custom kernels required for OpenVZ or Vserver. For Linux, I think this leaves me with lxc (on Ubuntu 9.10), User Mode Linux, or qemu. I'm having a hard time finding comparisons between them. Performance is a concern, as is the ability to provide SMP to the guests. I would also like to use COW/sparse roots to reduce guest provisioning. My question is, what are the trade-offs between these options?

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  • NST-475LX-BK NAS Enclosure Is It Any Good?

    - by peter
    Hi All, Has anyone got one of these NST-475LX-BK? It is this, Vantec NexStar LX Ultra Gigabit NAS Hard Drive Enclosure. http://www.vantecusa.com/front/product/view_detail/403#rev What are your experiences with it? What type of file system does it format the drive to? It has an eSata cable so it must support NTFS right? Or does it use ext3? How good is the media streaming? What type of files can it stream? MPEG 2? Thanks.

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  • The difference between desktop-series HDD drives and server-series

    - by FractalizeR
    Hello. What are the main differences between desktop-series hard disks and server-series? The obvious things I can see are: durability (server hardware mostly more qualitative and have more warranty) and power consumption (server hardware more focused on performance, than on power economy). Also server disks are usually a little faster, but it seems, that it is not always the case. May be there are some other reasons, that make you choose server-oriented series (Seagate ES drives, for example) over desktop-oriented ones (Seagate Barracuda series)? What are they?

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  • Nexenta/OpenSolaris filer kernel panic/crash

    - by ewwhite
    I've an x4540 Sun storage server running NexentaStor Enterprise. It's serving NFS over 10GbE CX4 for several VMWare vSphere hosts. There are 30 virtual machines running. For the past few weeks, I've had random crashes spaced 10-14 days apart. This system used to open OpenSolaris and was stable in that arrangement. The crashes trigger the automated system recovery feature on the hardware, forcing a hard system reset. Here's the output from mdb debugger: panic[cpu5]/thread=ffffff003fefbc60: Deadlock: cycle in blocking chain ffffff003fefb570 genunix:turnstile_block+795 () ffffff003fefb5d0 unix:mutex_vector_enter+261 () ffffff003fefb630 zfs:dbuf_find+5d () ffffff003fefb6c0 zfs:dbuf_hold_impl+59 () ffffff003fefb700 zfs:dbuf_hold+2e () ffffff003fefb780 zfs:dmu_buf_hold+8e () ffffff003fefb820 zfs:zap_lockdir+6d () ffffff003fefb8b0 zfs:zap_update+5b () ffffff003fefb930 zfs:zap_increment+9b () ffffff003fefb9b0 zfs:zap_increment_int+68 () ffffff003fefba10 zfs:do_userquota_update+8a () ffffff003fefba70 zfs:dmu_objset_do_userquota_updates+de () ffffff003fefbaf0 zfs:dsl_pool_sync+112 () ffffff003fefbba0 zfs:spa_sync+37b () ffffff003fefbc40 zfs:txg_sync_thread+247 () ffffff003fefbc50 unix:thread_start+8 () Any ideas what this means?

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  • Problem restarting my Ubuntu system

    - by VoY
    Whenever I try to restart my Ubuntu either from the command line by typing reboot or in GNOME the computer goes from X to console, starts the shutdown process and then a message saying "[ some number ] Starting new kernel" appears on the screen and the computer goes back to X login screen. I suspect this must have something to do with nvidia drivers, because it seemed to have appeared around the time I bought a new graphic card. Also, when I reboot the second time I see weird graphical artifacts on the screen. When I boot from ubuntu live cd I can reboot just fine. I used jaunty, recently I switched to karmic with no change. This bug is very annoying, because I have to hard reset my computer in order to reboot. Also not good for the filesystems, I suspect. Can you suggest a way to debug the cause or if not at least the easiest way to go about reinstalling ubuntu without losing customizations/settings/data?

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  • VSFTPD and Implicit SSL

    - by Luma
    Hi Everyone, I have a Debian Dedicated server and I want to enable Implicit SSL on it using VSFTPD and I am having a hard time. I have read online and the only thing I can really find is how to enable SSL and in the man pages it lists one implicit ssl command. but since Implicit ssl uses a second listener (990 by default) I have no idea how to make it work on Debian. Has anyone managed to get this working? Here is my config: listen=YES anonymous_enable=NO local_enable=YES write_enable=YES local_umask=022 connect_from_port_20=YES pam_service_name=vsftpd ssl_enable=YES allow_anon_ssl=NO force_local_data_ssl=NO force_local_logins_ssl=NO ssl_tlsv1=YES ssl_sslv2=NO ssl_sslv3=NO rsa_cert_file=/etc/ssl/certs/vsftpd.pem if I include Implicit_SSL=YES the server won't even start. thanks

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  • How to recover bitlocker encrypted partition that is now 'unallocated'/'free space'?

    - by Atishay Jain
    My hard drive had 5 partitions(including 1(some 4-5GB) bit locker encrypted one). When I used disk mgmt I could view 2 partitions(24.4GB and 8.94GB) in green colour labeled Empty space. So, I wanted to merge them and I used minitool partition wizard for the purpose. I don't know, what that software did, but all I was left with 2 partitions and lots of green free space. I recovered 2 partitions using EaseUS partition master, but the bitlocker encrypted partition cannot be searched by it(and also minitool partition recovery). Now, the disk mgmt shows 2 free space partitions of 28.36GB and 8.94GB respectively. Here is a screenshot http://s14.postimage.org/4tvij041t/Screen_Shot003.jpg Please, tell me a way to recover the bitlocker encrypted partition that is showing as a free space in disk management. P.S. - It contains very important data.

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  • Difference between XeTeX and LuaTeX

    - by Konrad Rudolph
    I have a hard time contrasting XeTeX and LuaTeX. At the moment, I am using XeTeX almost exclusively, mainly because it uses UTF-8 as the native input encoding and because it supports TTF and OTF fonts. However, the lack of support for pdftex’ microtyping is mildly annoying. LuaTeX, on the other hand, does support this, as well as UTF-8 input and (rudimentary?) fontspec support. So my question boils down to: Is there any advantage in using XeTeX over using LuaTeX? Has anybody used both and can compare them? In particular, LuaTeX sounds very experimental and unstable – but is this really the case?

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  • kmemsize problems in VPS even when there is about 500MB free mem

    - by Amer
    Hello, I have a site hosted on a Plesk VPS with 512MB memory and keep on getting kmemsize in "black zone" QoS errors. The soft limit of kmemsize is 12,288,832 and hard limit is 13,517,715. The definition Virtuozzo gives is: Size of unswappable memory, allocated by the operating system kernel. What's eating up the kmemsize? Is there any way to reconfigure and increase the kmemsize? The servers barely have any load or processing. Thanks for the help...

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  • explorer.exe eating all CPU, how to to detect culprit?

    - by JohnDoe
    Windows 7 64bit. I am using ProcessExplorer from Sysinternals, and it says, that the offending call is ntdll.dll!RtlValidateHeap+0x170 however, the call stack towards the entry is always different, so it's hard for me to track the problem. Maybe it's a mal-programed trojan, causing exceptions in Explorer.exe, but that is only a wild speculation. Explorer.exe is then consuming 25% (a core on a dual core). Killing the process makes the task bar go away, respawning from task manager, and half a minute later it's again eating all CPU cycles.

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  • How to troubleshoot a GPF?

    - by AngryHacker
    I get a GPF dialog box out of the blue fairly often (like about 2 hours after I turn on the computer). It basically says that svchost.exe had a failure... (see the corresponding Event Log entry below). Event Type: Error Event Source: Application Error Event Category: (100) Event ID: 1000 Date: 5/18/2010 Time: 7:41:16 PM User: N/A Computer: DKHA-IPSA Description: Faulting application svchost.exe, version 5.1.2600.5512, faulting module ole32.dll, version 5.1.2600.5512, fault address 0x0004eaa9. Shortly after this error pops up, the computer pretty much grinds to a halt (e.g. some UI elements on the desktop simply do not respond). And I have to do a hard reboot. How do I troubleshoot this type of thing? P.S. The PC has all the latest patches and nothing is missing in the Device Manager.

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  • Choosing a very basic Linux distro with minimal boot time?

    - by user30961
    I've had Ubuntu for a year now, like it but it doesn't match my needed configuration for my old laptop. So... I am using Linux mainly for webapps so I don't care much about user interface. What I need is a distro which is small enough to install on a SD memory card (or USB) since I am removing the hard drive, all my data is in the cloud. I also want it to have as short boot time as possible. I tried Puppy Linux and it seems ok but it had preinstalled looots af small apps I don't need, I would really like to have a distro with minimal preinstallations and add them on my own. So what are my choices and why would you recommend these?

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  • If Nvidia Shield can stream a game via WiFi (~150-300Mbps), where is the 1-10Gbps wired streaming?

    - by Enigma
    Facts: It is surprising and uncharacteristic that a wireless game streaming solution is the *first to hit the market when a 1000mbps+ Ethernet connection would accomplish the same feat with roughly 6x the available bandwidth. 150-300mbps WiFi is in no way superior to a 1000mbps+ LAN connection aside from well wireless mobility. Throughout time, (since the internet was created) wired services have **always come first yet in this particular case, the opposite seems to be true. We had wired internet first, wired audio streaming, and wired video streaming all before their wireless counterparts. Why? Largely because the wireless bandwidth was and is inferior. Even today despite being significantly better and capable of a lot more, it is still inferior to a wired connection. Situation: Chief among these is that NVIDIA’s Shield handheld game console will be getting a microconsole-like mode, dubbed “Shield Console Mode”, that will allow the handheld to be converted into a more traditional TV-connected console. In console mode Shield can be controlled with a Bluetooth controller, and in accordance with the higher resolution of TVs will accept 1080p game streaming from a suitably equipped PC, versus 720p in handheld mode. With that said 1080p streaming will require additional bandwidth, and while 720p can be done over WiFi NVIDIA will be requiring a hardline GigE connection for 1080p streaming (note that Shield doesn’t have Ethernet, so this is presumably being done over USB). Streaming aside, in console mode Shield will also support its traditional local gaming/application functionality. - http://www.anandtech.com/show/7435/nvidia-consolidates-game-streaming-tech-under-gamestream-brand-announces-shield-console-mode ^ This is not acceptable to me for a number of reasons not to mention the ridiculousness of having a little screen+controller unit sitting there while using a secondary controller and screen instead. That kind of redundant absurdity exemplifies how wrong of a solution that is. They need a second product for this solution without the screen or controller for it to make sense... at which point your just buying a little computer that does what most other larger computers do better. While this secondary project will provide a wired connection, it still shouldn't be necessary to purchase a Shield to have this benefit. Not only this but Intel's WiDi claims game streaming support as well - wirelessly. Where is the wired streaming? All that is required, by my understanding, is the ability to decode H.264 video compression and transmit control/feedback so by any logical comparison, one (Nvidia especially) should have no difficulty in creating an application for PC's (win32/64 environment) that does the exact same thing their android app does. I have 2 video cards capable of streaming (encoding) H.264 so by right they must be capable of decoding it I would think. I should be able to stream to my second desktop or my laptop both of which by hardware comparison are superior to the Shield. I haven't found anything stating plans to allow non-shield owners to do this. Can a third party create this software or does it hinge on some limitation that only Nvidia can overcome? Reiteration of questions: Is there a technical reason (non marketing) for why Nvidia opted to bottleneck the streaming service with a wireless connection limiting the resolution to 720p and introducing intermittent video choppiness when on a wired connection one could achieve, presumably, 1080p with significantly less or zero choppiness? Is there anything limiting developers from creating a PC/Desktop application emulating the same H.264 decoding functionality that circumvents the need to get an Nvidia Shield altogether? (It is not a matter of being too cheap to support Nvidia - I have many Nvidia cards that aren't being used. One should not have to purchase specialty hardware when = hardware already exists) Same questions go for Intel Widi also. I am just utterly perplexed that there are wireless live streaming solution and yet no wired. How on earth can wireless be the goto transmission medium? Is there another solution that takes advantage of H.264 video compression allowing live streaming over a wired connection? (*) - Perhaps this isn't the first but afaik it is the first complete package. (**) - I cant back that up with hard evidence/links but someone probably could. Edit: Maybe this will be the solution I am looking for but I still find it hard to believe that they would be the first and after wireless solutions already exist. In-home Streaming You can play all your Windows and Mac games on your SteamOS machine, too. Just turn on your existing computer and run Steam as you always have - then your SteamOS machine can stream those games over your home network straight to your TV! - http://store.steampowered.com/livingroom/SteamOS/

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  • Applying memory limits to screen sessions

    - by CollinJSimpson
    You can set memory usage limits for standard Linux applications in: /etc/security/limits.conf Unfortunately, I previously thought these limits only apply to user applications and not system services. This means that users can by bypass their limits by launching applications through a system service such as screen. I'd like to know if it's possible to let users use screen but still enforce application limits. Jeff had the great idea of using nohup which obeys user limits (wonderful!), but I would still like to know if it's possible to mimic the useful windowing features of screen. EDIT: It seems my screen sessions are now obeying my hard address space limits defined in /etc/security/limits.conf. I must have been making some mistake. I recently installed cpulimit, but I doubt that's the solution.Thanks for the nohup tip, Jeff! It's very useful. Link to CPU Limit package

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  • Cannot resize OS X partition

    - by David Pearce
    I am trying to resize my existing Mac OS Extended partition on my Macbook to install Windows 7 (using steps similar to these), but when ever I go to apply the changes, I get this error: Partition failed Partition failed with the error: The partition cannot be resized. Try reducing the amount of change in the size of the partition. The total capacity of the hard drive in question is 260GB, with the entirety being taken up by the OS X boot partition. There is I am aiming to shrink that partition down to 60GB. How can I fix this problem? I have been reducing the amount of change by 10GB each attempt, but it still is not working. I assume the problem is that there is not a large amount of continuous space on the device. Is there some way to can do a manual defrag that would rectify this problem?

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  • Robocopy to a drive connected to a wlan router fails

    - by Ville Koskinen
    I have a wireless router and an USB hard drive connected to it. Basic file access on the command line and Explorer works flawlessly after having set up some options on the router and mapping to some folders with net use k: \\ROUTER\Folder1 /user:MYLAPTOP\Me password /persistent:yes net use n: \\ROUTER\Folder2 /user:MYLAPTOP\Me password /persistent:yes Robocopy (and using SyncToy for that matter) to a network drive however fails: robocopy c:\Files k:\Backup /MIR /Z gives There is not enough space on the disk. 2010/01/05 09:52:11 ERROR 112 (0x00000070) Accessing Destination Directory N:\ Waiting 30 seconds... The error message is misleading: there is plenty of space on the disk and the folders I'm copying are small. The router is an ASUS WL-500gp with a standard firmware. I'd appreciate if someone would be able to explain what is causing the problem and, if possible, how to fix it.

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  • Recovering database files from a corrupted VHD

    - by Apocalypse9
    We have a SQL server hosted on a virtual machine. Our hosting company updated/restarted the server and for some reason the virtual machines became unbootable. We've spoken to Microsoft and used a few higher level tools to attempt to recover the virtual machines but were unsuccessful. In browsing the file system the database folder doesn't even appear. I'm wondering if there are any lower level tools that might be able to find and copy the database files. As far as I know the physical hard drive is ok, so I'm hoping there may be some way to recover the files themselves even if the rest of the virtual machine file-system is a loss. Obviously we're in a bit of a bind, and any help/ suggestions are very much appreciated.

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  • Dell Latitude e6520 gaming capabilities?

    - by user1072185
    I am purchasing a very reduced Dell Latitude e6520 from a friend and was wondering what kinds of games I could play on it and what resolutions. I'm not buying it for gaming purposes, but I am curious. The specs are as follows: Intel® Core™ i7-2720QM (2.20GHz, 6M cache) with Turbo BoostTechnology 2.0 nVidia® NVS™ 4200M 512MB DDR3 Discrete Graphics for Quad Core upon further research, the CPU requires this graphic card. 4.0GB, DDR3-1333MHz SDRAM 500GB 7200rpm Hard Drive I may upgrade to 8GB memory, depending if I am bogged down, what do you guys think?

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  • Installing Windows Server 2003 on AMD environment

    - by santhosh kumar
    Hi all, Our organisation we have 25 computers and we are trying to setup Windows Server 2003. We are planning to configure Active Directory NAT DNS server Visual Studio Team Foundation Server Subversion (SVN) Trac (Bug tracking tool) FTP server And our Hardware configuration is AMD Athlon 64 X2 Dual (Core processor 5600+, 2.60 GHz) Asus motherboard (M2N series) Transcend 4 GB RAM (800 MHz) 500 GB Hard Disk (RAID enabled) But my colleague is advising me AMD won't suite for servers platforms, and use Intel environment. Also they telling we can't install all the services to one server. I got confusion what to do?... Is really can`t install above services to AMD computer? Thanks...

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