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  • Data Center Design and Preferences

    - by Warner
    When either selecting a data center as a co-location facility or designing a new one from scratch, what would your ideal specification be? Fundamentally, diversified power sources, multiple ISPs, redundant generators, UPS, cooling, and physical security are all desireable. What are the additional key requirements that someone might not consider on the first pass? What are the functional details someone might not consider during the initial high level design?

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  • Program for Synchronizing folders across multiple computers automatically

    - by Mcad001
    I work in a company of about 20 people, I need to share some files with all of them in a folder(s) (files are constantly changed by me).., so they need to get the latest changed file automatically (pushed to their computer) What's the best program/system for this task? I need to be able to administrate their read/write access to the folder on a user level. Windows Live Mesh seemed to be perfect for me, but unfortunatly there's a limit of only 9 people in that system.

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  • Is it safe to run two instances of svnserve on one repository, or only one?

    - by fredden
    We've two nodes running heartbeat/drbd, and one of the services we're using is subversion. What I want to know is: is it safe to run svnserve on both nodes all the time, or should it only run on the active node? Does svnserve use file-level locking, or is it all in memory? What are the implications of running svnserve without its repositories accessible? Please let me know if this isn't clear, and I'll try my best to rephrase/clarify. :)

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  • Create and manage child name servers (glue records) within my domain?

    - by basilmir
    Preface I use a top level domain provider that only allows me to add "normal" third-party name servers (a list where i can add "ns1.hostingcompany.com" type entries... nothing else) AND "child name servers" which i can later attach to my parent account ( ns1.myowndomain.com and an ip address). They do not provide other means of linking up. I want to host my own server and dns, even with just one name server (at first). My setup: Airport Extreme - get's a static ip address from my ISP Mac Mini Server - sits behind the Airport and get's a 10.0.1.2 My problem is that i can't seem to configure DNS correctly. I added a "child nameserver" with my airport's external static ip address at the top level provider, so to my understanding i should have all DNS traffic redirected to my Airport. I've opened port 53 UDP to let the traffic in. Now, what i don't get is this. My Mini Server is sitting on a 10.0.1.2 address and i have setup dns correctly, with an A record to point and resolve my server AND a reverse lookup to that 10.0.1.2. So it's ok for "internal stuff". Here is the clicker... How, when a request comes from the exterior for a reverse lookup, does the server "know" ... well look i have everything in 10.0.1.2 but the guy outside needs something from my real address. I can't begin to describe the MX record bonanza... How do i set this "right"? Do i "need" my Mini Server to sit on the external address directly (i can see how this could be the preferred solution, being close to a "real" server i have in my mind). If not... do i need a PTR record on the 10.0.1.2 server but with the external address in there? My dream: I will extend this "setup" with multiple Mini's in different cities where i work. I want a distributed something (Xgrid comes to mind). PS. Be gentle, i've read 2 books and the subject, and bought both the Lynda Essentials and DNS and Networking to boot, still i'm far from being on top of things.

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  • Multiline Equation won't center and align on equals sign

    - by cubicleWar
    I have a multiline equation which I wish to align on the '=' and center the equation block on the page. I have selected align on '=' and center as a group, however the equation group becomes left justified on the page (and aligned on the =). No matter what I do I cannot get it to concurrently center the group on the page and also align on the '='. Does anyone know what setting at what level would cause this type of behavior? (I'm using MS Word 2011 on OS X 10.8)

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  • Computer won't start after installing new video card

    - by Vercas
    So, 1 year and 340 days ago I bought a desktop computer. Since then, it has served me well. But lately, I wanted an upgrade, so I bought a new video card. I documented myself about the compatibility, and it is okay. So I opened the case, cleaned up that... dust elemental living inside of it. Unscrewed the plastic thingie on the outside to unscrew the old video card. Because of the stupid arrangement of the ports, I had to unscrew the motherboard to unplug it. So I unscrewed it, removed the old card, put in the new one, moved the motherboard back, screwed it back in, screwed the video card on the holder... thingie, and screwed the plastic thingie back in. Everything went smoothly, nothing had to be forced in/out. I connected the external power supply, closed the computer case, put the tower back in it's place and all the cables back in. When I pressed the power button, the LED turned... some color I can't distinguish. It stayed that way for a second, and then it went off. I tried a bunch of things, including permuting the external power supply arrangement (1 connection, 2 connections and no connections), with no success. And here are some of the specifications: Motherboard manufacturer: Asrock Processor: AMD Athlon II X2 3.0 GHz RAM: 2 x 2GB (had only 1 initially, bought the second plate a bit later) OLD video card: AMD Radeon HD 5450 NEW video card: Gigabyte nVidia GeForce GTX 650 GPU, 1GB GDDR5 128bit PCI-E, Dual-link DVI-Dx2 / HDMI / D-Sub Power supply: 450W + all the requirements I managed to find on the internet are met (+12V 18A or something) More specific information is stored... On that computer. If required, I may open the case again and read the stickers to find more specific information. I can also provide photos if necessary. Any ideas? Suggestions? Something? :|

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  • Google Apps: MX records for zonefile

    - by 23tux
    Hi everybody, I have a question about using Google Apps for handling emails. I don't want to set up a whole entire mail system on my server, so I decided to use Google Apps. The ownership of my domain is approved, and now I'm trying to change the MX records in the zone file of my domain. But I think I'm doing wrong, it doesn't work. I want to use mail.mydomain.com as a adress to the mail server for POP, SMTP and IMAP. My zone file looks like this: $TTL 86400 @ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. ( 2011011700 ; serial 14400 ; refresh 1800 ; retry 604800 ; expire 86400 ) ; minimum @ IN NS robotns3.second-ns.com. @ IN NS robotns2.second-ns.de. @ IN NS ns1.first-ns.de. @ IN A 111.111.111.111 localhost IN A 127.0.0.1 www IN A 111.111.111.111 ftp IN CNAME www loopback IN CNAME localhost mail IN CNAME @ relay IN CNAME www @ IN MX 10 ALT1.ASPMX.L.GOOGLE.COM. @ IN MX 10 ASPMX3.GOOGLEMAIL.COM. @ IN MX 10 ASPMX2.GOOGLEMAIL.COM. @ IN MX 10 ASPMX.L.GOOGLE.COM. @ IN MX 10 ALT2.ASPMX.L.GOOGLE.COM. I hope someone can figure out, what's wrong with this configuration. When I start a ping on mail.mydomain.org I get an answer from 111.111.111.111 and not from the google server ALT1.ASPMX.L.GOOGLE.COM. thx, tux

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  • Western Digital HDD now freezes my BIOS when loading the video card!

    - by Vercas
    After I have successively and successfully installed 3 Windows XP's on the same partition (Don't ask why...), I restarted my computer again and the BIOS just froze when it loaded the video card. Together with my uncle, we tracked down the problem and found out it's the HDD's fault. We tried booting without the HDD and it worked! (No other HDD (I have only one) but with a Ubuntu Live CD in.) We tried the HDD with a different data bus (It was from an identical computer) but that one didn't let my BIOS recognize the HDD. We also put the HDD in another computer as the second HDD and it DID recognize it but Windows XP kept saying it cannot install a driver and that it installed successfully. Happily, I have managed to backup some of my most important files in that other computer. The following is a list of tests that we have run. With the HDD Original data bus Original computer Result: BIOS freezes WITHOUT the HDD Original data bus Original computer Result: Everything works just fine! With the HDD ANOTHER data bus Original computer Result: Cannot see the HDD With the HDD Original data bus ANOTHER computer Result: It worked! With the HDD ANOTHER data bus ANOTHER computer Result: It worked! During the tests, we had only two data buses and two computers. (each data bus from it's own computer) Strange thing is that the second data bus cannot let the BIOS see the HDD in my computer but works just fine with the other computer. I beg you to help me! I have my most important data on that HDD and I really cannot afford to buy another decent IDE HDD now!

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  • In-Place DC Upgrade from Server 2003R2 Standard to 2008 Enterprise

    - by Yadhu Tony
    We have a Domain controller in server 2008 Enterprise and Additional DC in server 2003 R2. Now I need to upgrade Additional Domain controller to Server 2008 Enterprise and raise the domain functional level to 2008. The DC is running with Active Directory, DNS and DHCP. The server is installed in VMware ESXi 4.0. Please guide me to carry out the upgrade. Also I want to know about the possible risk of in-place upgrade, if any.

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  • Motherboard Dying? AHCI Drive Init and boot loop intermittent failure

    - by Adam Heath
    My computer is now intermittently failing to boot up. For the last couple of days, when I turn it on it hangs on "AHCI Drive Init...", and when powered off and on again, it booted up fine. Today, it did the same but failed in a few other ways too, seemingly at random: Hangs on "AHCI Drive Init..." Boot loop (after "AHCI Drive Init..." appears for a split second (no drives listed)) Black screen (after "AHCI Drive Init..." appears for a split second, a black screen with all fans still running) The interesting part is that the above is not affected by what drives are connected, or what to. I have tried both disks, each disk individually and no disks (along with trying the primary and secondary SATA controllers), none of this has any effect on what happens. After about 20+ attempts of different combinations, it suddenly decided it would boot up into Windows, and I hadn't touched anything for about 2 cycles. Motherboard: Gigabyte GA-870A-USB3 Processor: Amd Phoenom II x6 1090T RAM: 8GB Corsair 1600 Primary Disk: Plextor 128GB SSD Secondary Disk: Western Digital Black 1TB OS: Windows 8.1 Is this my motherboard dying? Or could something else be the cause? Thanks!

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  • Windows 7: "Replace All Child Object Permissions" Doesn't Stay Checked

    - by raywood
    I right-click on a top-level folder in Windows Explorer. I choose Properties Security tab Advanced Change Permissions. I check "Replace all child object permissions with inheritable permissions from this object" Apply. I get a Windows Security dialog that says, "Setting security information on" the list of objects that flashes by. But now the "Replace all child object permissions" box is unchecked. What is happening here?

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  • Finding the reason of a force shutdown of a VM

    - by Ricardo Reyes
    We have a linux VM running under XenServer that reboots itself with no apparent reason. Checking the /var/log files in Xen we noticed that it's sending a force shutdown to the VM, like this: messages:Dec 6 15:01:07 XenSrvDell2 BLKTAP-DAEMON[7309]: /local/domain/0/backend/tap/19/51728: got start/shutdown watch on /local/domain/0/backend/tap/19/51728/tapdisk-request What we can't find is the reason why the force-shutdown was initiated. Is there any "higher level log" that might tell us who or why triggered the shutdown?

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  • Setting up ssh config file with id_rsa through tunnel

    - by Rubens
    I've been struggling to set up a valid configuration to open a connection with a second machine, passing through another one, and using an id_rsa (which requests me a password) to connect to the third machine. I've asked this question in another forum, but I've received no answer that could be considered very helpful. The problem, better described, goes as follows: Local machine: user1@localhost Intermediary machine: user1@inter Remote target: user2@final I'm able to do the entire connection using pseudo-tty: ssh -t inter ssh user2@final (this will ask me the password for the id_rsa file I have in machine "inter") However, for speeding things up, I'd like to set my .ssh/config file, so that I can simply connect to machine "final" using: ssh final What I've got so far -- which does not work -- is, in my .ssh/config file: Host inter User user1 HostName inter.com IdentityFile ~/.ssh/id_rsa Host final User user2 HostName final.com IdentityFile ~/.ssh/id_rsa_2 ProxyCommand ssh inter nc %h %p The id_rsa file is used to connect to the middle machine (this requires me no password typing), and id_rsa_2 file is used to connect to machine "final" (this one requests a password). I've tried mixing up some LocalForward and/or RemoteForward fields, and putting the id_rsa files in both first and second machines, but I could not seem to succeed with no configuration whatsoever. Hope somebody can help me here! Regards! P.S.: the thread I've tried to get some help from: http://www.linuxquestions.org/questions/linux-general-1/proxycommand-on-ssh-config-file-4175433750/

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  • Duplication of Architecture State means physically extra?

    - by Doopy Doo
    Hyper-Threading Technology makes a single physical processor appear as two logical processors; the physical execution resources are shared and the architecture state is duplicated for the two logical processors. So, this means that there are two sets of basic registers such as Next Instruction Pointer, processor registers like AX, BX, CX etc physically embedded in the micro-processor chip, OR they(arch. state) are made to look two sets by some low level duplication by software/OS.

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  • Copy CakePHP site under IIS webroot?

    - by dan giz
    I've got a CakePHP application that uses a MSSql server running on windows server 2008r2 enterprise using IIS 7.5 My application is the only website running and is installed into wwwroot with cakephp installed to c:\inetpub (one level up from the site) I want to copy this site so i can have a development version to work on, without conflicting with the live site. how do i go about doing this? i'm confused, since previous set ups i've seen have a different folder in wwwroot for the site itself.

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  • Why is my server performance degrading to the point of stopping, periodically?

    - by Pascal Aschwanden
    So, once in a while, I see in firebug that a request takes over 15 or even 60 seconds to respond and sometimes never. Here is what I've ruled out: It's not the CPU, cuz every time I check the Server load its less then 6 for all 3 numbers It's not the memory, because thats fairly low too, less the 50% It's not the I/O anymore, because I've seen the graphs that Joyent sent back to me when I requested them, and they show less then 3MB of I/O (mostly all read). It's not the SQL performance - I've profiled every last SQL command that runs, and they're all (99.9% of them anyway) running in less then 30ms, most run in less then 5ms. Oh and I've been profiling all the script execution times, and even the when the problem occurs, the script always manages to finish in 50ms or less (that's 1 / 20th of a second ). Now, I do run alot of ajax calls. 1 every 2 seconds per user and I have 300 DAU+. But, even if all 300 are playing simultaneously, thats still only 150 calls per second max. The only other thing I can think of is that one of my neighbors is funky. The problem is highly intermittent. 99% of the time it works perfectly and there's excellent performance. but 99%+ is not good enough. Eventually the performance gets so bad I have to restart the server, at which point everything is fine again. I've done this about 4 times now. Any ideas? Note: this is on joyent, vps, intro package 256mb of ram with bursting. here are the mysql dump info: Traffic ø per hour Received 18 MiB 29 MiB Sent 134 MiB 221 MiB Total 151 MiB 251 MiB Connections ø per hour % max. concurrent connections 5 --- --- Failed attempts 0 0.00 0.00% Aborted 0 0.00 0.00% Total 9,418 15.59 k 100.00%

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  • Apache using 100% CPU, once again

    - by CBenni
    Recently, apache2 started using 100% of CPU power: top gives me From other, similar threads, I took the tip to use mod_status. Aside from HUGE amounts of NULL requests, it gives: CPU Usage: u2.16 s1.32 cu0 cs0 - .0835% CPU load 1.2 requests/sec - 17.6 kB/second - 14.6 kB/request 8 requests currently being processed, 42 idle workers The access and error logs do not show anything surprising or intriguing at all. Note the .8% CPU usage. Another tip was to use strace: root@server:~# strace -p 1956 Process 1956 attached - interrupt to quit restart_syscall(<... resuming interrupted call ...> And remains like this for at least half an hour, without producing any additional output. Restarting apache fixed the problem for less than a second The server runs a few custom python scripts aswell as a django-powered website on apache2 (up-to-date), but even turning the scripts off (or not having them active in the first place) did not change anything. After I stopped apache and powered my server off, powered it on a few minutes afterwards and restarted all my services, the CPU usage remained low for several hours, just in order to pop up again randomly (?) The DigitalOcean CPU stats on my server are: You can see how the CPU usage was super high for almost half a day until I restarted the bot - just to remain stable for several hours and then pop up again. I am completely at a loss of words and don't know what I could do to find out what piece of my code is giving me these problems or if apache itself is the cause... Therefore I would greatly appreciate any hints to the questions: What else can I try to do? Which things might I not have checked? Is this definitely in my own code? How do you find what part of python code crashes an app via a infinite loop or similar?

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  • Cross-reference of computers having virtualization technology [closed]

    - by msorens
    When considering obtaining a new computer one of my prerequisites is the ability to load Windows 8 in a virtual machine (using VirtualBox). A prerequisite for that is that the host computer have virtualization technology. I located an Intel cross reference of chips having virtualization technology but I am trying to find a "higher level" cross reference between computer models and virtualization technology availability, skipping the extra step of having to first look up what CPU chip is in a machine, then cross-referencing that on Intel's list.

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  • Using Lan Management port - which kind of switch for remote control?

    - by zephyrus
    Hello everyone, I have no expertize in server hardware, however i have some IBM X3550 7978 and HP DL 160/G6 servers with 2 Lan ports, and a management port (that seem to be another Lan port). Have anyone tried to use the management to control remotely the low level functions of the servers (reboots for example) ? Which kind of switch or other devices have you used for this? thank you Massimiliano

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  • Nagios DNX plugins

    - by danneh3826
    I'm toying with the idea of multiple Nagios instances setup to monitor our infrastructure. I've looked at all the various methods of distributed Nagios checks, and I think DNX comes out the closest. DNX handles failure of worker nodes, that's fine. What happens if the main DNX server fails though? Is there a way to replicate the server too? I'm using AWS EC2 primarily, so I can utilise Elastic Load Balancing for the web UI, but I need to be able to handle the AZ where the monitoring server is to fail over, and essentially for a second to pick up the checking load (active/passive, active/active, so long as it doesn't fail completely) The other thing I'm trying to solve is an issue with routing. What I'd like is to have multiple nodes report a fault before Nagios confirms it as critical. Not the NRPE checks, as they're pretty self explanitory, but things more like check_ping. I often have routing issues out of AWS to certain datacenters, so Nagios can often report bad/no ping/timeout as a critical issue, even though the machine in question is working fine. Would it be possible to have a setup where a worker complains a service check is critical, and have a second worker node (positioned in another datacenter/AZ) also report the service as critical before the Nagios central server issues a critical alert? I realise I might be asking a bit much (how far down the line do you go setting up failover systems before it starts to get ridiculous), however surely someone must have thought of this scenario when developing DNX?

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  • CPU usage always below 10% in windows server 2008 r2 x64

    - by ???
    I am using a server with windows server 2008 r2 running on it to run my program. The CPU of the server is Intel xeon x5570 2.93GHz with 2 processors, 8 cores per processer. However, I found that the cpu usage is almost always below 10% even I use 32 threads in my program. And I also found that sometimes the cpu usage could reach as high as 93% through the task manager when running my program and at that moment my program has processed over 1000 files per second while normally, it only processed over 50 files per second. However, this does not happen often. I use tools downloaded from the internet to make sure no core sleeps when the server is on, nothing changed. Also, I edited the windows register to make sure that I, as an administer, have no cpu usage limit. But it changed nothing. Is there anyway that I can make full use of my cpu? That is to say that each core runs a thread of my program and the total cpu usage could reach over 50% when I use a reasonable number of threads in my program. Did this happen to anyone of you? And could you help me with this ? Thank you!

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