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  • How to SSH an outside server from a computer which is behind a proxy firewall ?

    - by Karan
    I access the Internet through an HTTP proxy firewall at college. And I need to login to a computer, via SSH, which is outside our network. I tried it as Linux command and on Windows using PuTTY. I also configured PuTTY to use our server's address. But still, "Proxy error: 403 forbidden" pops up. They must've blocked SSH access to outside systems. (college systems as accessible). I can SSH a web server (not the proxy server) at the college, which I use to browse proxy-free by tunneling. Now this server allows to browse restricted sites, but still no SSH. Any workaround, please?

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  • Get-QADComputer -LdapFilter & NOT operator

    - by dboftlp
    I'm having issues excluding an OU from my LDAP filter $DaysAgo = (Get-Date).AddDays(-31) $ft = $DaysAgo.ToFileTime() Get-QADComputer -SizeLimit 0 -IncludeAllProperties -SearchRoot 'DC=My,DC=Domain,DC=Local' -LdapFilter "(&(objectcategory=computer)(lastLogonTimeStamp<=$ft) (!(ou:dn:=DisabledPCs))(|(operatingsystem=Windows 2000 Professional) (operatingSystem=Windows XP*)(operatingSystem=Windows 7*) (operatingSystem=Windows Vista*)(operatingsystem=Windows 2000 Server) (operatingsystem=Windows Server*)))" I'm looking to query for all Windows OS systems that haven't logged in to AD for more than 31 days & that are not already in the OU "DisabledPCs", which is where I'll be moving them to. When I run it now, I'm getting all the systems I'm looking for, including those in the "DisabledPCs" OU... I've tried several variations including: (&(!(ou:dn:=DisabledPCs))) As well as putting it in different locations in the filter (not that I thought it would make a difference, but I obviously don't know that...) Thanks in advance for any help, -dboftlp

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  • Waht are the best proxy servers for Mikrotik router?

    - by niren
    I want to setup proxy server for my Mikrotik router. There is inbuilt web-proxy for Mikrotik router but I can extend this upto transparent proxy(kind of proxy server) only. We need High anonymity proxy so that we can hide our LAN static IPs(we don't have private IP) from outside Intruder/hackers. And also I know I can setup NAT rule to hide our IP(only private IP not public/static IP) as per this link, but I cann't hide static/public IP. Essentially I want to hide our Public/Static IP (there is static/public IP for all systems in our company) from outside Internet. To achieve this I guess I need other software apart from Mikrotik router gateway setup. can anyone suggest me Is there any other software to achieve my requirement? I know about squid proxy but am not sure whether It can hide our static/public IP. Note: we have assigned public/Static IP to all systems of our company since we have rights to access our company's system from anywhere by dedicated laptop(given by our company with more security) through VPN connection.

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  • Out of nowhere, ssh_exchange_identification: Connection closed by remote hot me too

    - by dgerman
    See similar: Out of nowhere, ssh_exchange_identification: Connection closed by remote host Today, 6/19/12 attempting to ssh to the same host as usual ssh replied ssh_exchange_identification: Connection closed by remote host two additional attempts failed ssh -v $RWS OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: Applying options for * debug1: Connecting to Real-World-Systems.com [174.127.119.33] port 22. debug1: Connection established. debug1: identity file /Users/dgerman/.ssh/id_rsa type 1 debug1: identity file /Users/dgerman/.ssh/id_rsa-cert type -1 debug1: identity file /Users/dgerman/.ssh/id_dsa type -1 debug1: identity file /Users/dgerman/.ssh/id_dsa-cert type -1 ssh_exchange_identification: Connection closed by remote host ping host was successful, ftp host was successful, ssh now successful, ssh -v $RWS OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: Applying options for * debug1: Connecting to Real-World-Systems.com [174.127.119.33] port 22. debug1: Connection established. debug1: identity file /Users/dgerman/.ssh/id_rsa type 1 debug1: identity file /Users/dgerman/.ssh/id_rsa-cert type -1 debug1: identity file /Users/dgerman/.ssh/id_dsa type -1 debug1: identity file /Users/dgerman/.ssh/id_dsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH_4* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.6 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'real-world-systems.com' is known and matches the RSA host key. debug1: Found key in /Users/dgerman/.ssh/known_hosts:5 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/dgerman/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Trying private key: /Users/dgerman/.ssh/id_dsa debug1: Next authentication method: password ++++ What gives?? +++++++++++ Mac OS X 10.4.7 , OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011, /Users/dgerman/.ssh > ls -la total 24 drwx------ 7 dgerman staff 238 Jun 19 15:46 . drwxr-xr-x 389 dgerman staff 13226 Jun 19 15:46 .. -rw------- 1 dgerman staff 1766 Feb 26 18:25 id_rsa -rw-r--r-- 1 dgerman staff 400 Feb 26 18:25 id_rsa.pub -rw-r--r-- 1 dgerman staff 67 Feb 26 18:27 keyfingerprint -rw-r--r-- 1 dgerman staff 6215 May 1 08:11 known_hosts -rw-r--r-- 1 dgerman staff 220 Feb 26 18:26 randomart

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  • adding a route entry to linux routing table

    - by netg
    hi, I have two systems with ip address say 64.103.56.1(A)(Dev name -wlan0) and 64.103.225.18(B),now what i want is , everytime I ping B from my system A, it has to be routed via a router say with address 10.0.0.251(C)(I want this to be my next hop to reach B) , but this router is on a different subnetwork than the two systems.How do I do this? /* Things I tried: I used 'route add -host B gw C wlan0', and got an error saying " no such process exist or no such device found". Tried ping C and traceroute and found the gw addr at my side is some 63.103.236.3(D), so added another entry route add -host C gw D wlan0, I was able to do this without any error! */

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  • Device CAL, User Cal or Processor license needed for SQL 2008 (architecture explained inside)?

    - by nycgags
    So we have a number of servers in the Amazon cloud running SQL Server Standard edition to aggregate data. For that purpose we are fine, the licensing is handled by our contract with Amazon, no problem there. For the beefier work, we want to install Enterprise Edition (EE) on our servers processing raw data so that we can take advantage of table partitioning. We currently have 3 servers aggregating data from about 40 node servers, all 43 of these servers are running standard edition which is fine. We also have 4 servers running standard processing the raw data, but I think we can get away with 2 (for redundancy) running Enterprise Edition. We have 2-3 dba's that access these DW servers for maintenance (using the same windows login via remote desktop). So visually: 40 -- 3 -- [2] -- 2 -- 1 nodes -- aggregators -- raw (which we want to run EE) -- calculators -- datawarehouse Nodes PUSH to aggregators, Raws PULL from aggregators, Calculators PULL from Raw, Calculators PUSH to datwarehouse I am specifying the push vs. pull in case that changes how the # of licenses is calculated. Q1) how many device (or user) CAL's do we need? Q2) do I need to speak with someone from MSFT to find out if it is ok to install in the Amazon Cloud (Amazon said we need to verify it is ok in our license terms)? Q3) what happens if another device tries to access a server with the limited number of device CAL's? Q4) Are the device CAL's simultaneous number of devices or total? Q5) Do Device and User CAL's cost the same or is there a difference? Q6) Would we need to buy a processor license (we are hoping not to)?

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  • Dir all files to output.log, including message "File Not Found"

    - by user316687
    I'm trying to dir a bunch of files with dos command: dir My dir.bat file: dir E:\documentos\57\Asiento\01\"Asiento 3 Modificacion de Estatuto.doc" dir E:\documentos\134\Asiento\01\"File Does Not Exist.doc" dir E:\documentos\55\Asiento\01\"Asiento 5 Padron de Afiliados Segunda Entrega.doc" The second one doesn't exist. Then, when running my bat: C:\myuser>E:\dir.bat > output.log I open output.log and don't find any message about the file that was not found. Output.log : E:\documentos>dir E:\documentos\57\Asiento\01\"Asiento 3 Modificacion de Estatuto.doc" Volume in drive E is New Volume Volume Serial Number is 0027-F7F6 Directory of E:\documentos\57\Asiento\01 20/12/2005 06:41 p.m. 40,960 Asiento 3 Modificacion de Estatuto.doc 1 File(s) 40,960 bytes 0 Dir(s) 17,053,155,328 bytes free E:\documentos>dir E:\documentos\134\Asiento\01\"File Does Not Exist.doc" Volume in drive E is New Volume Volume Serial Number is 0027-F7F6 Directory of E:\documentos\134\Asiento\01 E:\documentos>dir E:\documentos\55\Asiento\01\"Asiento 5 Padron de Afiliados Segunda Entrega.doc" Volume in drive E is New Volume Volume Serial Number is 0027-F7F6 Directory of E:\documentos\55\Asiento\01 08/08/2007 08:33 a.m. 40,960 Asiento 5 Padron de Afiliados Segunda Entrega.doc 1 File(s) 40,960 bytes 0 Dir(s) 17,053,151,232 bytes free Is there any way that output.log shows "File Not Found" message?

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  • Is there still a place for tape storage?

    - by Jon Ericson
    We've backed up our data on LTO tapes for years and it's a real comfort to know we have everything on tape. A sister project and one of our data providers have both moved to 100% disk storage because the cost of disk has dropped so much. When we propose systems to potential customers these days we tend to downplay or not mention our use of tape systems for data storage since it might seem outdated. I feel more comfortable with having data saved in two separate formats: disks and tape. In addition, once data is securely written to tape, I feel (perhaps naively) that it's been permanently saved. Not having to rely on a RAID controller to be able to read back data is another plus for me. Do you see a place for tape backup these days?

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  • Automation of software installation - should I ask for text or file?

    - by Denis
    I am preparing a software installation in Windows environment for my application. During installation it asks for Subscriber ID which should be entered into text field. I am wondering if it is a best solution for mass installations. I know that for mass installations IT teams use systems like Microsoft System Center which allow automate deployment. But I do not know much about capabilities of such systems. Can such system automate data entry into the text fields? Will it be better to change installation process and ask not a text but a file which contains Subscriber ID? By the way, I am looking for beta testers for my software. This software let user view Microsoft Project files without having Microsoft Project installed.

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  • Preventing SSH RSA host key warnings for change of key vs IP address

    - by Adam M-W
    I have a network with DHCP enabled, and also a computer that dual boots operating systems and has different SSH keys on each (and yes, I would like to keep different keys on each rather than copying the same identity/private key to each). Because the IP address does not change between operating systems because the MAC address is the same, when connecting to ssh, even when not using the IP address but the hostname via DNS/mDNS, I get the warning: Warning: the RSA host key for 'hostname' differs from the key for the IP address '192.168.1.172' Offending key for IP in /Users/user/.ssh/known_hosts:37 Matching host key in /Users/user/.ssh/known_hosts:38 Are you sure you want to continue connecting (yes/no)? How can I surpress the warning when the hostname differs from the IP address for that hostname, but retain the ability to check host keys are the same for each hostname? (each OS has a unique hostname)

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  • Windows Login Failure

    - by Chris Bateson
    I'm getting an error in the Event Viewer, which is also generating a lot of Logon Failure messages on our syslog server. Pretty much stuck on how to resolve. EventID: 536 Logon Type: 3 Reason: The NetLogon component is not active This is for a Windows Server 2003 system. I have checked here We're using Shavlik Protect 9 to scan and deploy patches. Shavlik stores the credentials for the systems and uses those stored credentials to deploy patches. This system is able to scan and deploy to other systems on the network using those credentials and no errors are generated. When installing to the local system that Shavlik is physically on then this error is generated. Whats interesting is that it doesn't generate during a scan, and the patches install fine. We've contacted Shavlik to get the response that they are unable to help since it's a Microsoft error. Has anyone seen this?

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  • Which CMS for a mobile app? No HTML, just XML or JSON

    - by Sascha
    I am a newbie in content management systems. I would need a CMS that can transfer content by XML or JSON to a client. It is ok if the CMS can also manage HTML websites, but the priority is on the data transfer over a web service. Which is the best CMS to use here? I want to avoid spending endless hours learning all the big CMS systems just to find out that they don't support this feature or that it's badly integrated. Thanks.

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  • Possible disk IO issue

    - by Tim Meers
    I've been trying to really figure out what my IOPS are on my DB server array and see if it's just too much. The array is four 72.6gb 15k rpm drives in RAID 5. To calculate IOPS for RAID 5 the following formula is used: (reads + (4 * Writes)) / Number of disks = total IOPS. The formula is from MSDN. I also want to calculate the Avg Queue Length but I'm not sure where they are getting the formula from, but i think it reads on that page as avg que length/number of disks = actual queue. To populate that formula I used the perfmon to gather the needed information. I came up with this, under normal production load: (873.982 + (4 * 28.999)) / 4 = 247.495. Also the disk queue lengh of 14.454/4 = 3.614. So to the question, am I wrong in thinking this array has a very high disk IO? Edit I got the chance to review it again this morning under normal/high load. This time with even bigger numbers and IOPS in excess of 600 for about 5 minutes then it died down again. But I also took a look at the Avg sec/Transfer, %Disk Time, and %Idle Time. These number were taken when the reads/writes per sec were only 332.997/17.999 respectively. %Disk Time: 219.436 %Idle Time: 0.300 Avg Disk Queue Length: 2.194 Avg Disk sec/Transfer: 0.006 Pages/sec: 2927.802 % Processor Time: 21.877 Edit (again) Looks like I have that issue solved. Thanks for the help. Also for a pretty slick parser I found this: http://pal.codeplex.com/ It works pretty well for breaking down the data into something usable.

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  • Removing a device in "removed" state from Linux software RAID array

    - by Sahasranaman MS
    My workstation has two disks(/dev/sd[ab]), both with similar partitioning. /dev/sdb failed, and cat /proc/mdstat stopped showing the second sdb partition. I ran mdadm --fail and mdadm --remove for all partitions from the failed disk on the arrays that use them, although all such commands failed with mdadm: set device faulty failed for /dev/sdb2: No such device mdadm: hot remove failed for /dev/sdb2: No such device or address Then I hot swapped the failed disk, partitioned the new disk and added the partitions to the respective arrays. All arrays got rebuilt properly except one, because in /dev/md2, the failed disk doesn't seem to have been removed from the array properly. Because of this, the new partition keeps getting added as a spare to the partition, and its status remains degraded. Here's what mdadm --detail /dev/md2 shows: [root@ldmohanr ~]# mdadm --detail /dev/md2 /dev/md2: Version : 1.1 Creation Time : Tue Dec 27 22:55:14 2011 Raid Level : raid1 Array Size : 52427708 (50.00 GiB 53.69 GB) Used Dev Size : 52427708 (50.00 GiB 53.69 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Fri Nov 23 14:59:56 2012 State : active, degraded Active Devices : 1 Working Devices : 2 Failed Devices : 0 Spare Devices : 1 Name : ldmohanr.net:2 (local to host ldmohanr.net) UUID : 4483f95d:e485207a:b43c9af2:c37c6df1 Events : 5912611 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 1 0 0 1 removed 2 8 18 - spare /dev/sdb2 To remove a disk, mdadm needs a device filename, which was /dev/sdb2 originally, but that no longer refers to device number 1. I need help with removing device number 1 with 'removed' status and making /dev/sdb2 active.

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  • Prevalence of WMI enabled in real Windows Server networks

    - by TripleAntigen
    Hi I would like to get opinions from systems administrators, on how common it is that WMI functionality is actually enabled in corporate networks. I am writing an enterprise network application that could benefit from the features of WMI, but I noted after creating a virtual network based on Server 2008 R2, that WMI seems to be disabled by default. Do systems admins in practical corporate networks enable WMI? Or is it usually disabled for security purposes? What is it used for if it is enabled? Thanks for any advice! MORE INFO: I should have said, I really need to be able to query the workstations but I understand that by default the WMI ports on Win7 and XP firewalls (at least) are disallowed, so do you use some sort of group policy or other method to leave a hole open for WMI on the workstations? Or is just the servers that are of interest? Thanks for the responses!!

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  • How to connect AD Explorer from Sysinternals to Global Catalog

    - by Oliver
    I'm using the sysinternals AD Explorer quite frequently to search and inspect an Active Directory without any big problems. But now i'd like to connect not only to a single AD Server. Instead i like to inspect the global catalog. If i enter within the AD Explorer connect dialog only the dns name of the machine (e.g. dns.to.domain.controller) that is serving the global catalog i only receive the concrete domain for which it is responsible, but not the whole forest (that's normal behaviour and expected by me). If i'm going to add the default port number (3268) for the global catalog in the form dns.to.domain.controller:3268 AD Explorer will simply crash without any further message. The global catalog itself works as expected under the given name and port number, cause our apache server use exactly this address and port number to authenticate some users. So any hints or tips to access the global catalog out of AD Explorer? Or there are any other nice tools like AD Explorer out there that doesn't have any problems to access the global catalog?

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  • Video codec that can be read on clean installs of either Windows, OS X and Ubuntu

    - by fmercille
    I have to make a video that will need to be watched on different operating systems. Is there a "universal" video codec that can be played on Windows, OS X and Linux without requiring additional plugins or player other than those that comes on a default clean install of each of those systems? Compression is not an issue, I'm merely looking for compatibility (e.g. for audio, I would use WAV as a universal codec). Note : I must assume that the video will be distributed in countries where software patents are enforced, and therefore can't rely on the user to install non-free codecs on Linux. Thanks.

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  • How can I stop Excel from eating my delicious CSV files and excreting useless data?

    - by atroon
    I have a database which tracks sales of widgets by serial number. Users enter purchaser data and quantity, and scan each widget into a custom client program. They then finalize the order. This all works flawlessly. Some customers want an Excel-compatible spreadsheet of the widgets they have purchased. We generate this with a PHP script which queries the database and outputs the result as a CSV with the store name and associated data. This works perfectly well too. When opened in a text editor such as Notepad or vi, the file looks like this: "Account Number","Store Name","S1","S2","S3","Widget Type","Date" "4173","SpeedyCorp","268435459705526269","","268435459705526269","848 Model Widget","2011-01-17" As you can see, the serial numbers are present (in this case twice, not all secondary serials are the same) and are long strings of numbers. When this file is opened in Excel, the result becomes: Account Number Store Name S1 S2 S3 Widget Type Date 4173 SpeedyCorp 2.68435E+17 2.68435E+17 848 Model Widget 2011-01-17 As you may have observed, the serial numbers are enclosed by double quotes. Excel does not seem to respect text qualifiers in .csv files. When importing these files into Access, we have zero difficulty. When opening them as text, no trouble at all. But Excel, without fail, converts these files into useless garbage. Trying to instruct end users in the art of opening a CSV file with a non-default application is becoming, shall we say, tiresome. Is there hope? Is there a setting I've been unable to find? This seems to be the case with Excel 2003, 2007, and 2010.

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  • Strange IP address showing up with OS X ssh

    - by user50799
    I was futzing around with DTrace on Mac OS X and found the following script that prints out information about connections being established: $ cat script.d syscall::connect:entry { printf("execname: %s\n", execname); printf("pid: %d\n", pid); printf("sockfd: %d\n",arg0); socks = (struct sockaddr*)copyin(arg1, arg2); hport = (uint_t)socks->sa_data[0]; lport = (uint_t)socks->sa_data[1]; hport <<= 8; port = hport + lport; printf("Port number: %d\n", port); printf("IP address: %d.%d.%d.%d\n", socks->sa_data[2], socks->sa_data[3], socks->sa_data[4], socks->sa_data[5]); printf("======\n"); } I run it in one window: $ sudo dtrace -s ./script.d Then I ssh to another machine from another window. I get this output from my dtrace window: CPU ID FUNCTION:NAME 0 18696 connect:entry execname: ssh pid: 5446 sockfd: 3 Port number: 22 IP address: 192.168.0.207 ====== 0 18696 connect:entry execname: ssh pid: 5446 sockfd: 5 Port number: 12148 IP address: 109.112.47.108 ====== ^C The first IP address I can explain (192.168.0.207), that's the machine I'm connecting to. But what's with the 109.112.47.108 machine? It doesn't show up in tcpdump nor netstat -an Is there something with my dtrace code or my understanding of how the connect system call works?

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  • top process state column under FreeBSD

    - by Eric DANNIELOU
    When running top interactively, I can see various word in the state column : nanslp, biord, select, uwait, lockf, pause, kqread, piperd, sbwait ... Some like nanslp or kqread are self explanatory, others are not. Tried man pages : STATE is the current state (one of "START", "RUN" (shown as "CPUn" on SMP systems), "SLEEP", "STOP", "ZOMB", "WAIT", "LOCK" or the event on which the process waits), C is the processor number on which the process is executing (visible only on SMP systems) Tried search engines : stack overflow mailing lists archives Where may I get a complete list of possible process state under FreeBSD 9, and their meanings?

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  • Workflow Automation software for SVN

    - by KyleMit
    We're currently using IBM's ClearQuest for task management and ClearCase for change management. They plug and play very well with each other. Users can create tasks in ClearCase as defects and enhancements, and developers can use those tasks to check out and modify code in source control. We're looking to upgrade to a better, more modern Source Control system, like SVN, although we're not married to that as our Source Control system. There are loads of source control systems out there, but I'm having difficulty finding one that also includes the ability to have users enter tasks and track them, especially in a native way to the source control system itself. Are there any products that replace ClearQuest for systems like SVN? Are there any other cheap / open source application pairs that handle both sides of the coin?

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  • mass deploy Oracle patches with OEM with different OS's

    - by bobsmith12
    I have not been able to get this to work. We are running our OEM grid control database/oms on Red Hat 5(32 bit), but our databases are on Solaris x86-64. I could not mass deploy agents since the Operating Systems were different. When I download patches it is by OS. Is there a way to mass deploy to multiple operating systems? I have alot of databases. I was given the redhat server for OEM because it was available. We are have 10.1,10.2, and 11.1 databases. OEM DB is 10.2.0.5

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  • What should a hosting company do to prepare for IPv6?

    - by Josh
    At the time of writing The IPv4 Depletion Site estimates there are 300 days remaining before all IPv4 addresses have been allocated. I've been following the depletion of IPv4 addresses for some time and realize the "crisis" has been going on for many years and IPv4 addresses have lasted longer than expected, however... As the systems administrator for a small SaaS / website hosting company, what steps should I be taking to prepare for IPv6? We run a handful of CentOS and Ubuntu Linux systems on managed hardware in a remote datacenter. All our servers have IPv6 addresses but they appear to be link local addresses. Our primary business function is website hosting on a proprietary website CMS system. One of my concerns is SSL certificates; at the moment every customer with an SSL certificate gets a dedicated IPv4 IP address. What else should I be concerned about / what action should I take to be prepared for IPv4 depletion?

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  • How frequent are network partitions on cloud services?

    - by roja
    Much is made of the CAP trade-off for data storage where conflicts can be introduced if there is a network partition. My question is there any evidence that this is a problem that arises with any significant frequency in modern cloud IAAS services e.g.; EC2, Azure, Rackspace. Is it a problem which, despite being a theoretical roadblock in constructing idealised distributed systems is, in fact, a non-issue for all practical concerns? Has anyone experienced a network partition within one of these systems (within a single data-centre?) If so would you be willing to share any details?

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  • when to upgrade server to include more cores, versus more processors, versus additional server?

    - by gkdsp
    The server hosting market is separated into single, double, qual, etc., processors, where each processor has several cores, or CPUs. My company will offer a Linux-based web application that relies on an Apache web server and a middle tier for business logic. The middle tier is used to crunch math, and return result to a client. Many clients may access the application simultaneously. The company will start with one processor having 4 cores. I'm trying to understand how the app uses the cores and then how to scale the application as business grows, in terms of servers/processors/cores. For example, I'd assume initially one core would be used for Apache, and the other 3 used to process client's requests for math crunching... Question 1: does that mean, with the 3 cores available, I can handle 3 separate client requests simultaneously (e.g. 1 for each of 3 cores)? I mean, except for the shared RAM, is this effectively like having 3 individual machines (from pt of view or processing client requests simulaneously)? Or, only one client's request may be processed at any one time, but that client's request is divided up into up to 3 cores depending on the type of process running that does the math crunching and whether or not it can take advantage of multi threading (so the # of cores impacts how fast any one client request completes)? I'm confused about what the cores mean to the application here. Question 2: As the business grows and more client requests need to be processed, should the server be upgraded to (A) a new machine with more cores, (B) a new machine with two processors, 4 cores each, or (C) keep the original server and add another server with a single processor? Which route provides the most efficient way to scale the application, in terms of processing more client requests per time interval? Is the choice, for example, limited by RAM (when you need more RAM than box can handle it's time to add another server), or something else? Question 3: Is the total number of client requests processed simultaneously equal to the number of cores times the number of servers (minus the one core for Apache)?

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