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  • Run a MongoDB configuration server without 3GB of journal files

    - by Thilo
    For a production sharded MongoDB installation we need 3 configuration servers. According to the documentation "the config server mongod process is fairly lightweight and can be ran on machines performing other work". However, in the default configuration, they all have journalling enabled, and with preallocation this takes up 3 GB of disk space. I assume that the actual data and transaction volume of a config server is quite small, so that this seems a bit too much. Is there a way to (safely!) run these config servers with much less disk use for the journal? Do I need journalling at all on config servers? Can I set the journal size to be smaller?

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  • What would happen in a Software Raid 1 of one HDD and one SSD?

    - by Adrian Grigore
    Hi, I'm running my Windows 7 installation and all of my apps from an SSD for performance reasons. Since SSD's can instantly die at any moment, I'm looking for some kind of data backup strategy. Right Now I regularly backing up the drive image on a hard disk, but that only happens once per day, which is not enough for my taste. So I got an idea: What if I created a software raid 1 of the SSD and partition on my Hard disk? All data would be mirrored on both drives, making this a lot safer. But what about performance? Will Windows 7 detect that the SSD is faster than the hard drive and always read from the SSD? Or will it randomly read from both, thus reducing read performance? Thanks, Adrian Edit: I just found this article which basically answers my question. Feel free to close this post.

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  • Install Windows Server 2008 Core on a Dell Optiplex 790

    - by Alex Marshall
    Does anybody have experience installing Windows Server 2008 Core on a Dell Optiplex 790? When I connect to the machine with the Hyper-V Manager Administrator snap-in, and try to create and run a virtual machine, I get the error "The Virtual Machine could not be started because the hypervisor is not running". I've disabled the Execute Disable functionality in the BIOS as was requried for other Dell models, but no matter what combination of security and virtualization settings I use on the machine, I can't get this working. EDIT: I've installed Windows Server 2008 Core on a Dell Optiplex 790, and I'm trying to install and setup a guest VM on the Hypervisor EDIT 2: The Hyper-V role is installed and configured, without any errors in the event log. Hardware-assisted virtualization is also enabled.

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  • Questions about adding space to an Amazon EC2 Instance

    - by Misha
    I have an Amazon EC2 instance that is running a simple LAMP stack with Amazon's flavor of linux. I want to stop it and add more disk space. We will need more than our current 8 gigabytes. I was wondering: 1) When I stop my instance what will be lost? Will the content of /var/www be lost? What does this mean? I am sure my instance isn't a spot instance. 1.5) What is an ephemeral disk? Is my instance completely ephemeral? Are parts of it ephemeral? When I press "stop", probably, not everything is cleared. So what is cleared? 2) Amazon has tools in the Management Console to facilitate enlarging an instance? 3) Will I have to re-partition the instance? Can an instance expand the partition it is running on?

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  • Reset Mac OS X (Snow Leopard) File Permissions -- All Files

    - by Frank
    Is their a script or process completely reset all file system file permissions to factory default? (Less restoring from a image backup or reinstalling the OS). This would include I've affected all files from / to Applications and home folder and all contents. (Everything) I've tried to use the Disk Utility's First Aid 'Repair Disk Permissions' but it didn't seem to touch or affect everything - some but not all. I've ran it twice so far... I've seen this but it's not quite the something. Fixing mac user file permissions, not the system The reason for all of this is I accidentally ran a chmod on all files (as sudo). Working too fast, now I'm in a hole.

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  • Why do I have multiple drives in my backup system image?

    - by bebop
    I have a drive which has 2 partitions. One is where the OS is installed, the other is a data (but not libraries) drive. When I try and create a backup using the built in tool, it wants to include both partitions in the system image. Why does it do this? If I move the os to a separate drive will I be able to back up just this data? Edit: To be more clear. I have 4 disks in the machine. 1 disc has 2 partitions. These are c: and e:, the other disks are d: f: and h:. The OS is installed on c: and libraries are stored on h:. The libraries are already backed up using crashplan, but I want to create a system image so I can easily restore the machine, if it either dies or if I get a SSD drive. When I choose backup (either through the wizard or if I open it through control panel) and check (or click) create a system image it automatically adds both c: and e: to the list of drives that will be backed up, and I cannot change this, the checkboxes to unselect are greyed out. I would like to know why it automatically adds e: to the list (but not h:, where the libraries are) and if I can change some setting so whatever files it has on e: that it thinks need to be backed up as part of the system image are moved to c:. How can I determine what they are? Is it because c: and e: are partitions of the same disk? If I move c: tro a different disk will that mean I only have to back up c:? Thanks Edit 2: I have viewed all files including hidden and system ones on both drives and it seems that I have a suspicous hidden e:\boot\ folder. I think that I might have installed the OS as a VHD at first then installed a seperate version straight on the disk, having dual boot for a while, then used EasyBCD to remove the VHD boot and file. Might this be what is causing my issue? How might I go about removing this? is it safe to just delete the boot folder?

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  • performance of vmware-machine on different computers

    - by bxshi
    I'm working on a filesystem improving project, and found a paper says the cheating on benchmark, and it gives a solution that use VMs could help others to reproduce our result. And the question is, if I have made a specific vmware virtual machine, will it runs the same at different computer and platform? For example, I have a virtual machine which is 1G RAM, 4G HD and 2G one-core CPU. Will that runs the same at a qual-core 3G CPU and a 2.4G P4? What if the computer have 4G RAM? Will vmware use some buffer mechanism to improve performance? If that's true, does it means the VM runs on a 2G RAM host will slower than on a 4G host? Hope you can help me on that, or just told me where could I find the answer.

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  • Postfix configuration problem

    - by dhanya
    Can anyone help me by giving your postfix configuration file as a reference so that I can find my mistakes? I'm working on SUSE Linux Enterprise Server. My goal is to set up a mailserver in a campus network. Postfix shows it is running but no mail is sent to var/spool/mail I send mail using mail command at terminal. Here is my main.cf file, please help me finding a solution: readme_directory = /usr/share/doc/packages/postfix-doc/README_FILES inet_protocols = all biff = no mail_spool_directory = /var/mail canonical_maps = hash:/etc/postfix/canonical virtual_alias_maps = hash:/etc/postfix/virtual virtual_alias_domains = hash:/etc/postfix/virtual relocated_maps = hash:/etc/postfix/relocated transport_maps = hash:/etc/postfix/transport sender_canonical_maps = hash:/etc/postfix/sender_canonical masquerade_exceptions = root masquerade_classes = envelope_sender, header_sender, header_recipient myhostname = cmail.cetmail delay_warning_time = 1h message_strip_characters = \0 program_directory = /usr/lib/postfix inet_interfaces = all #inet_interfaces = 127.0.0.1 masquerade_domains = cetmail mydestination = cmail.cetmail, localhost.cetmail, cetmail defer_transports = mynetworks_style = subnet disable_dns_lookups = no relayhost = postfix mailbox_command = cyrus mailbox_transport = strict_8bitmime = no disable_mime_output_conversion = no smtpd_sender_restrictions = hash:/etc/postfix/access smtpd_client_restrictions = smtpd_helo_required = no smtpd_helo_restrictions = strict_rfc821_envelopes = no smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination smtp_sasl_auth_enable = no smtpd_sasl_auth_enable = no smtpd_use_tls = no smtp_use_tls = no alias_maps = hash:/etc/aliases mailbox_size_limit = 0 message_size_limit = 10240000

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  • Cannot boot from USB on my Mac mini

    - by Thai Tran
    Two weeks ago I installed OSX 10.8 on my Mac mini. After that, my system started to hang a lot, so I tried to erase it and install OSX 10.7 again. I used carbon Copy Cloner to make the bootable USB and it can load successfully on another Macbook. However, on my Mac mini, when I press on the option button to select the USB, it loads the white screen with a ban symbol at the center of the screen. After a moment, my machine automatically shuts down. Does anyone know how to solve this problem? Edit: this is exactly the problem I have now http://forums.macrumors.com/archive/index.php/t-1207168.html Update 1: the hdd seems ok (from disk utility). I restored the booting partition by disk utility (drag the dmg file to that partition). After restarting and using that partition to boot, prohibited symbol is still there

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  • Performance issue when configuring non HA VM in cluster

    - by laiys
    Hi, I saw this article http://technet.microsoft.com/en-us/library/cc764243.aspx Quote taken from the link “ Important It is recommended that you not deploy virtual machines that are not highly available on your host clusters. Although you can do this by using Hyper-V (VMM does not allow it), the non-highly available virtual machines will consume resources that otherwise would be available to the HAVMs What kind of resources (CPU,memory, NIC, etc) that non HA VM will consume? Just curious as not all VM (in production) not to be in Failover Cluster and Live Migration. If i put the VM into CSV but did not make it as HA, what impact does it make since i allocate same vCPU, vNic and VMemory into the VM. (not to mention that i lost failover feature). Curious to understand more about this. Please advise. Thanks

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  • How can I stop sysprep from interacting with boot on windows 7

    - by Grofit
    I have recently had a laptop sent back to supplier for fixing a mainboard fault. I got it back today and every time it boots up I am faced with: "Setup is preparing windows for first time use" Then once it gets to the desktop I get the sysprep dialog come up asking if I want OOBC or Audit actions. I can close it, but it just keeps coming back, and I cannot find any startup or boot actions, even downloaded autoruns, and that cannot find anything to do with it. Ideally I do not want to format/fdisk as I have just spent hours installing everything on the laptop and I have my primary C:/ which has all windows and at worst case I can get rid of that, but I have a secondary partition D:/ which has alot of stuff I cant lose as its work related and important. Also to make matters more difficult I do not have a windows 7 disk, it was just pre-installed and they dont provide a disk. Any help would be great!

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  • requests are taken to the wrong directory

    - by gidireich
    Hi, I use xampp on windows 7 64, to test locally my php web application I use virtual hosts to have access to my code from different domain names. Now, I created a new version of the code and want to access both versions using different domain names. I added a new virtual host newversion.mysite.local to httpd-vhosts.conf and directed it to the directory of the new version. Also updated the windows hosts file with the line 127.0.0.4 newversion.mysite.local A strange thing happens: when browsing to newversion.mysite.local I'm being taken to the old version, which is located at a different location. How the hell this happens? Please help me with ideas Thank you Gidi

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  • Terminal services and memory limits

    - by Mark Wassell
    Is there a way in Terminal Services to set limits on memory related parameters for a process. For example working set size and, possibly, if it makes sense, total virtual memory allocation for the session? To turn the question around, we have an application which cannot allocate as much virtual memory running on a terminal server as it can when running on a desktop PC (both I would expect to have a limit of 2GB for user mode address space) and I was wondering if there is another limit for processes or users on a terminal server. Perhaps even 2GB per user rather than per process.

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  • VMware Virtualisation - Convert 64bit Windows Server to 32bit VM?

    - by dannymcc
    I have just started playing around with Vmware sphere and have the hypervisor OS installed on a spare HP ProLiant DL360 G4. I have created a test virtual machine running Ubuntu which has worked well. As a test project I wanted to convert a powered on server running Windows Server 2008 64bit into a virtual machine. As soon as I ran the Vmware Go software to start the conversion it became apparent that I cannot run 64bit guest OS's on that particular server. So, is there a way of migrating 64bit to 32bit during the conversion?

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  • What things should I run daily, weekly, monthly on my Windows machine?

    - by Jitendra vyas
    What things should I run daily, weekly, monthly on my Windows XP machine? De fragmentation Scan-disk Full system scan Disk clean up Trojan checker malware remover or any other thing... And should I run all these things in Safe-mode always? I want to perform all mentioned things automatically at night. How to set schedule and What would be the best plan? For daily weekly and monthly? I've 300 GB SATA HDD with 6 partition. I would like to know in above mentioned list: Which process should I run daily? Which process should I run weekly? Which process should I run on monthly basis How to set schedule for all in Windows task scheduler?

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  • Bridging VirtualBox over OpenVPN TAC adapter on Windows

    - by Sean Edwards
    I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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  • Disabling RAID feature on HP Smart Array P400

    - by Arie K
    I'm planning to use ZFS on my system (HP ML370 G5, Smart Array P400, 8 SAS disk). I want ZFS to manage all disks individually, so it can utilize better scheduling (i.e. I want to use software RAID feature in ZFS). The problem is, I can't find a way to disable RAID feature on the RAID controller. Right now, the controller aggregates all of the disks into one big RAID-5 volume. So ZFS can't see individual disk. Is there any way to acomplish this setup?

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  • How to make a pxe bootable 10MegaByte or larger dos image?

    - by rjt
    Would like to make a "massive" DOS floppy disk image, say 10MegaBytes or more containing all the firmware updates i need for any system, harddrive, BIOS. i do not need the DOS image to be networkable as everything will be on the PXE booted image, but networking would be nice. Since ZipDisks were attached to the floppy disk controller and were over 100MegaBytes, this should be possible. i tried a long time ago to do this and spent too much time on it only to have it fail to boot. So if someone has reliable instructions on how to create such a nightmarish beast and edit it, please let me know. One image that can used for PXE and copied to a USB stick would be a plus. Too bad manufacturers don't supply a single bootable Linux ISO containing all their firmware updates, that would be easy to boot over-the-lan and have networking. HP servers do this and it is awesome.

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  • Windows 7 - can't uninstall application as admin

    - by James Atkinson
    I'm trying to uninstall Microsoft Virtual PC 2007 from my Windows 7 machine. Logged in as administrator, when I attempt to uninstall I get a messagebox stating "The system administrator has set policies to prevent this installation." Excuse me? No I haven't. Immediately following, another messagebox displays: "You do not have sufficient access to uninstall Microsoft Virtual PC 2007. Please contact your system administrator." I didn't do anything unusual when installing or setting up the software. Just normal home use computer. Any ideas on how to remove this software?

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  • Windows 7 boot problem on a Lenovo Thinkpad Z61m 9450HAG

    - by Matt Taylor
    Hello, I recently did a full upgrade of windows 7 on my thinkpad, everything worked fine after up until the second reboot (the first reboot after some updates installed worked OK). At second reboot time the system would just black screen just before the Windows logo appears, disk/wireless/power/battery lights are all lit and the disk light is active (flickering). However, if I remove my battery and boot with just power it boots fine and quickly, and everything is OK. Any help on why this wont boot with battery plugged in is greatly appreciated - i need to take this battery out on the road/trains etc.... Cheers Matt

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  • VirtualBox networking problem, host XP, guest Debian

    - by Silma
    Hi, I'm trying to set up a development environment in a virtual machine on my laptop, with debian os. I have both lan and wlan available on the host machine, yet I can't connect to the internet using either. As I said the host OS is windows XP and the guest OS will be the latest Debian, we downloaded the business card net install so we need internet access from the beginning, besides we need the virtual machine to be visible on the local network (for my fellow developers). We tried host-only networking, NAT, bridging, with proxy (the local network uses a proxy to connect to the internet) and without proxy, nothing seems to work. What else can we do? Thanks a lot.

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  • Windows 2000 Inaccessible Boot Device

    - by Foo_Chow
    I am working with a machine that had its motherboard die. The machine is running Windows 2000 for legacy software. After the motherboard died I used disk2vhd to perform a physical to virtual transfer. The drive data seemed to copy over to the vhd file well. However, whenever i try to boot I get a message saying Inaccessible Boot Device So far I have tried several things to fix it. fixMBR fixBoot chkdsk windows 2000 automated repair Also, I have attempted to open the registry of the vhd without any success. There is another fix that i have seen suggested that requires editing the registry. Is it possible to open a Windows 2000 hive in another OS or another copy of Windows 2000? One other thing to note is that the error appears in all of Virtual PC 2007, Hyper-V and VMWare Player. Does anyone know how to get past this?

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  • How to define a layered model for Storage Architecture ?

    - by Berkay
    i don't have enough knowledge about storage systems but have to tell my audiences about how storage works in organization data centers. For this purpose to keep things simple, first i want to show them a layer model then from top to bottom and then i want to explore all these layers. What i mean by layered model in storage architecture? i want to start my presentation something like that, first layer can be applications, application request a data from storage and then ... ... (the topics i want to cover are file sytems, metadata,the physical implementation of storage (das, nas etc.) ... the request comes to the storage device and storage device (depends on the technology) goes through the disk and disk send back the data using iscsi protol, we can say that the iscsi protocol managing the path between... ... if you help me explain these steps layer by layer by examples and key technologies to be defined, really appreciate it. thanks.

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