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• Prevent EC2 machine from halt, poweroff, shutdown

  - by Adam Matan

  Hi, EC2 Ubuntu servers erase all disk contents when being shut down. Following an unfortunate accident, I have decided to prevent the command-live halt, poweroff and shutdown. What's the best way to do it? I thought about renaming these commands (at /sbin) to something like HALT_RENAMED___ERASES_ALL_DISK_CONTENTS. Are there any files, other than the three listed above, that needs to be handled? I've noticed that halt and poweroff are merely links to reboot. Should reboot be renamed, too? Adam

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• What is your IT-department to staff ratio?

  - by Bart Silverstrim

  This is a topic that may be rather political but it related to system administration still...how many people do you have supporting your users in your IT department? We have three people supporting something near 1500 systems and around 2400 people and a recent question was raised about why we have long times to get systems replaced, repaired, work orders fulfilled, etc. along with the system admin duties of maintaining the servers (mail, proxy, filters, VOIP, wireless, backup, etc.) Does anyone have numbers on what the "best practices" average is of support people to employees in an organization? EDIT:...from some of the answers that are appearing I'm starting to feel depressed...

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• P4 vs. i3/i5 *T in power consumption and performance [migrated]

  - by Walter Zomb

  I am running an Intel P4 prescott with HT on my home server (linux file server on encrypted disks on software-RAID5 and virtualisation host for three further machines). The performance for this purpose is really okay. When the system is idle it consumes about 140W power. I am considering buying a new mainboard for an e.g. Intel i3-2100T or an Intel i5-2390T. Both are low power CPUs with a TDP about 40W. Has anyone experiences how much power a recent mainboard with one of these CPUs an 3-4 'green-energy' disks (6W each) consumes? Do I get underneath the 100W threshold? What's about the performance of these low power CPUs? Are they comparable to an Intel P4 with HT? regards, walter

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• Oracle RAC interconnect in a Dell M1000e Blade Enclosure

  - by Antitribu

  We are looking at a Dell M1000e enclosure and appropriate Blades with 4 NICs each. We are planning on running Linux/Oracle 11g RAC on two blades, storage will be handled on an iSCSI SAN for which two NICs (via passthrough) will be connected leaving us with two NICs (via blade centre switches). We would like to have an interconnect (obviously) , an external IP and an internal IP. Would best practice be to: bond the remaining two interfaces and VLAN as appropriate to provide three virtual interfaces? run the interconnect on one interface and VLAN the external/internal interfaces? purchase a blade with more NICs as the above is a terrible idea? Another option? Please feel free to point out the blindingly obvious or to relevant documentation on support.oracle. I am specifically interested in supported configurations and best practices. Thanks!

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• Remote desktop connection issues in windows server 2003

  - by rboorgapally

  Hi all, We are running windows server 2003 at our work place. I have enabled the remote desktop connections. I have also added all the users who connect to the server(three to four people) to the RDC group of users. Many of these users are also having Administrator access. The problem we are facing is that the connection is suddenly lost when we are working on something. Also, at times the system restarts by itself. Is this issue related to the limit on the number of users able to connect to the system? If so, why does the system accept new connections and/or terminate the existing connections? Has this anything to do with the users having administrator access so that all have equal prority and that is why existing connections are stalled? Also, please differentiate between console remote desktop and non console remote desktop.

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• Clever recording using AVFoundation

  - by martin

  Hello I am working on my master thesis and I am programming app for iOS using AVFoundation framework. I can make by myself session and attach devices to it and record video with sound. The main problem is that I need continous recording (3hours or longer). After three hours user will stop recording and user will choose time eg. 15 mins (max 30 mins) and only this last 15 mins will be stored to iphone memory. Is it possible to 'cut' video while recording or should I record it eg. in 10 minutes block and then delete old video segments and last two segments connect to one bigger? Will perform these connections (stop recording, start new recording and then connect these two segments) lags in final long video segment? Is there any way to perform this 'clever' recording? Thank you for any ideas.

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• Is there any viable alternative to using a linux/unix/BSD firewall/router/vpn?

  - by ObligatoryMoniker

  I am trying to purchase something to replace our Vyatta router that is running in a virtual machine on Hyper V (having the whole network go down when the host has to reboot is not convenient and I am getting the sense that this configuration may not be stable). Most posts on this topic suggest using Linux/OpenBSD/FreeBSD/etc with some recommendations to use appliances from vendors for specific purposes like firewall and VPN. We are a windows shop and it has been a stretch for us to make use of Vyatta but since it was free and straightforward to use we decided to use it. Now we need something that is easier for our team to (re)deploy and manage. I would rather purchase something windows based or an appliance that can do all of the following things: DHCP server (reservations, specified gateway, dns, etc) Static Routes that route traffic across three interfaces Easily Reproducible (Powershell script, Puppet, Chef, etc) Intuitive interface (Decent web interface would be fine but I don't want them to have to go to CLI) Does any one have any recommendations on what I should be looking at that might meet our needs?

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• Error when trying to add additional mailbox in Outlook: The name could not be resolved.

  - by Jon B

  I am trying to open an additional mailbox in Outlook 2003 for one of my users. She already has three additional mailboxes in the list (found in the advanced account settings), and these work fine. When I click the "Add..." button, it immediately reports: The name could not be resolved. The action could not be completed. This is before I am prompted for the name. We're using an externally hosted Exchange 2007 server. How do I resolve this?

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• I bought a motherboard that supports DDR3 RAM

  - by CVertex

  I bought this ASUS Sabertooth X58 motherboard from http://msy.com.au/product.jsp?productId=7301 But I'm not sure what DDR3 RAM to buy. I haven't built a PC from scratch in about 3 years, and I'm wondering the following Do DDR3 ram chips need to be installed in three at a time? Or can I just install one or two now and install more later without any particular pattern? If I buy 2000MHz RAM from Corsair, will that work at 1866 MHz? (which is the highest frequency the motherboard supports) Is it just me or is 1866 RAM not around? Any help is greatly appreciated.

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• Performance Monitor (perfmon) showing some unusual statistics

  - by Param

  Recently i have thought to used perfmon.msc to monitor process utilization of remote computer. But i am faced with some peculiar situation. Please see the below Print-screen I have selected three computer -- QDIT049, QDIT199V6 & QNIVN014. Please observer the processor Time % which i have marked in Red Circle. How it can be more than 100%.? The Total Processor Time can never go above 100%, am i right? If i am right? than why the processor time % is showing 200% Please let me know, how it is possible or where i have done mistake. Thanks & Regards, Param

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• design a large scale network for an organization

  - by Essam

  i want to design a large scale network for an organization with HQ and two branches. i want to use a class A subnet. if i am using the network address 30.0.0.0 for the whole organization how can it be different from another organization company or whatever which is using the same address in another country? now i have the three locations for this organization,so i need 5 subnets [one for the HQ,two for branch A and branch B , one for connecting A to HQ and one for connecting branch B with HQ since i will use central DHCP server at the HQ,is that (number of subnetting) right? is it advisable to use class A or class B for this organization it term of address that will be wasted (let's say it is a university with two branches in two different states)?!

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• Rolling Back Microsoft CRM during testing

  - by npeterson

  Process related question: Currently we have a multi-tenant installation of MS CRM 4.0 on three servers, Dev, Test, and Live. We are actively working on customizing one of the tenants, but the others are static. During user testing, we often find it necessary to 'start fresh' in one of the tenants. Is it better to try and delete out the changes from the tenant (created accounts, leads, etc), or just revert the database to a backup from before the testing started? Is there compelling reasons why bulk delete is not advisable for MSCRM or that reverting the database frequently could cause issue?

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• Which software raid modes does each version of Windows 7 support?

  - by Goyuix

  Being familiar with the software raid modes and dynamic disks from the server versions, I was wondering if there is a document or even just common crowd knowledge that indicated what software raid support was available for each version of Windows 7. Also - all the various raid levels supported for booting or just a data recovery mechanism (e.g. you can connect three RAID-5 dynamic disks to an already booted system). I would prefer to stay away from modified/copied DLL's from the server variants, as well - please note - this is Windows software RAID - not fake-raid from your BIOS or an add-on card.

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• Issue with Exchange 2010 and Removing a Mailbox Database

  - by ThaKidd

  I did a 2003 to 2010 transition and everything is working well. During the 2010 install, a database was copied over with a random number at the end. I found out and moved three system mailboxes out of it into the database that all of the client accounts are in. I used the EMS to move those mailboxes to the other store then used the EMC to remove the mailbox database. Problem is, I am getting an error every few hours in event viewer now complaining about this database. Error is: MSExchageRepl - 4098 The Microsoft Exchange Replication service couldn't find a valid configuration for database '5f012f40-3bad-4003-a373-dbc0ffb6736f' on server 'SERVER'. Error: (nothing reported after this) Does anyone know how to fix this issue? In advance, I appreciate your help and thx for your valuable input!

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• Slave/secondary DNS nameserver

  - by user114671

  I'm learning about DNS and have a very basic, generic question about DNS but I can't find an answer anywhere. I have DNS for a few domains set up as follows: - master records with DNS company A - slave records with DNS company B Company A's nameservers are: ns1.companyA.com. ns2.companyA.com. ns3.companyA.com. ns4.companyA.com. ns5.companyA.com. and company B has three slaves: ns6.companyB.com. ns7.companyB.com. ns8.companyB.com. Everything works fine transferring the records between the nameservers and keeping them in sync. But my question is: The registrar of my domain example.com allows me to choose 4 nameservers only. Do I just pick the first 4 for company A, or do I need to include 1 or more of company B's slave nameservers too?

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• Difference between tcp recv buffer and tcp receive window size?

  - by pradeepchhetri

  The command shows the tcp receive buffer size in bytes. $ cat /proc/sys/net/ipv4/tcp_rmem 4096 87380 4001344 where the three values signifies the min, default and max values respectively. Then I tried to find the tcp window size using tcpdump command. $ sudo tcpdump -n -i eth0 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn and port 80 and host google.com' tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 16:15:41.465037 IP 172.16.31.141.51614 > 74.125.236.73.80: Flags [S], seq 3661804272, win 14600, options [mss 1460,sackOK,TS val 4452053 ecr 0,nop,wscale 6], length 0 I got the window size to be 14600 which is 10 times the size of MSS. Can anyone please tell me the relationship between the two.

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• How to use "Join Clip" in iMovie'09?

  - by deddebme

  I have been using iMovie'09 for two days only. I need to edit some videos and make a DVD for a friend. It happens to me that I want to join two clips together to form one continuous clip, so when I export the video to iDVD, they won't be treat as two different chapters. The most obvious way to do so is to choose Edit-Join Clip, but that menu item was always gray out when I chose two adjacent clips. I tried to highlight two/three adjacent clips, two apart clips etc, but it is still grayed out. I googled for a while but it seems no one knows, anyone knows how to use the "Join Clip"?

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• why is iometer performance slower after first run?

  - by Dan

  I'm doing some benchmarking with IOMeter, and I'm seeing a consistent and susbtantial drop-off in performance after running the first test. These drop-offs are about the same on the three systems I've tested on, which makes me think it's a configuration setting, or just a fact of life about using IOMeter. For example, one system (local RAID 10) went from 388 I/Os per second the first run, to about 211 I/Os per second on every run after that. Everything else about the test was identical, and I also bounced the machine in between runs. So, is this expected behavior, or am I missing something?

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• Is there an apache module to slow down site scans?

  - by florin

  I am administering a few web servers. Each night, random hosts from the Internet are probing them for various vulnerabilities in php, phpadmin, horde, mysqladmin, etc. Is there a way (apache plugin?) to slow down the rate of attack? For SSH, I have a rate limiting rule on the firewall, which does not allow more than three connections per minute. But I don't want to rate limit all HTTP access, only the access that returns 404s. Is there such an apache module?

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• What can I do with .chk files in FOUND.000 folders?

  - by Svish

  Just discovered I have gotten a FOUND.000 folder on my usb drive. I guess from running chkdsk once. It has three files in it: FILE0000.CHK FILE0001.CHK FILE0002.CHK What exactly can I do with these files? What are my options? Are they lost files? Are they garbage? Can I use them for anything at all? Or will I just have to delete them?

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• Network topology question

  - by Asbie

  We currently have three networks, X.X.163.1, X.X.93.1 and 192.168.1.1. Today's setup is like this: http://i.imgur.com/tkKWy.jpg We now have PPT VPN from internet to the X.X.163.1-network, but really need to access the files from the File Server through VPN. I am also aware that this setup is not optimal. So please, any advices on how to redesign our network? Rack servers are mostly web and db servers, with only public IP addresses.

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• Apache log file problem

  - by Luke

  I've recently set up an Apache 2 web server and I noticed a quite a few lines in the error and access log that start with the follow sequence (but longer). Does anyone know where this comes from? ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ....... My set up is an Apache 2 load balancer with mod_balancer enabled and two Apache 2 web servers. All three servers write to the same log files on a share located on a NFS. My first guess is that my problem has to do with it since it's the only difference that comes to mind from other set ups I've used in the past but I'm not sure.

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• NTFS Permission Structure to allow Traversal but no Modification except in Leaf Nodes?

  - by pepoluan

  Assume there's this folder structure: D:\ --+-- Acctg --+-- Payable | +-- Receivable | +-- Fin --+-- Inv | +-- Tax | +-- Treas | +-- Mrktg --+-- Ads +-- Promo Users are not allowed to change the structure, but they are free to create & delete files & folders in the leaf nodes (i.e., the rightmost folders). AGDLP principle said that I should assign permissions on the above folders to DL-Groups. Let's say I have a G-Group of users, G-Accounting-Payable, containing users that have access to the D:\Acctg\Payable folder. The way I see it, I have two strategies: - Strategy 1 Create three DL-Groups and assign them permissions: DL-D-Acctg_T -- allowed traversal of D:\Acctg folder DL-D-Acctg-Pay_LF -- allowed listing of D:\Acctg\Payable folder contents DL-D-Acctg-Pay__RW -- allowed full permissions to the contents of D:\Acctg\Payable folder Add G-Accounting-Payable as member to all the above DL-Groups - Strategy 2 Create just one DL-Group DL-D-Acctg-Pay__RW, and assign it the proper permissions for each level of the folder. Then, add G-Accounting-Payable as member to that DL-Group. - Which strategy is the Recommended Best Practice, and why?

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• Error installing Windows7 64 bits on VirtualBox

  - by MetaDark

  I am trying to set up Windows in Virtual Box, so I don't need to reboot in the rare occasion that I actually need it. The problem is, Virtual Box doesn't preform any errors when I insert the 32bit installation CD but when I try to use the 64bit installation; What!? I am already using the installation disc! I've checked my BIOS to see if I have SVM (AMD's version of VT) disabled and all I see is "Enabled" I have a K9N6PGM2-V2 motherboard A Triple Core AMD Athlon II A Nvdia NForce 430 integrated graphics card 4GB of RAM An 80GB IDE And a 1TB SATA I don't think the last three specifications matter but just in case XP I am pretty sure the CD isn't broken ( I am going to make sure in just a moment ), what could be the cause to this problem? Edit: The 64bit installation CD is not broken, but I found out when trying to install from the 32bit version that it's trying to upgrade, not preform a fresh install - Odd.

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• Order of mod_rewrite rules in .htaccess not being followed

  - by user39461

  We're trying to enforce HTTPS on certain URLs and HTTP on others. We are also rewriting URLs so all requests go through our index.php. Here is our .htaccess file. # enable mod_rewrite RewriteEngine on # define the base url for accessing this folder RewriteBase / # Enforce http and https for certain pages RewriteCond %{HTTPS} on RewriteCond %{REQUEST_URI} !^/(en|fr)/(customer|checkout)(.*)$ [NC] RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301] RewriteCond %{HTTPS} off RewriteCond %{REQUEST_URI} ^/(en|fr)/(customer|checkout)(.*)$ [NC] RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301] # rewrite all requests for file and folders that do not exists RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php?query=$1 [L,QSA] If we don't include the last rule (RewriteRule ^(.*)$ index.php?query=$1 [L,QSA]), the HTTPS and HTTP rules work perfectly however; When we add the last three lines our other rules stop working properly. For example if we try to goto https:// www.domain.com/en/customer/login, it redirects to http:// www.domain.com/index.php?query=en/customer/login. It's like the last rule is being applied before the redirection is done and after the [L] flag indicating the the redirection is the last rule to apply.

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