HA Building High Availability Systems?
has anyone had experience in building high availability systems?
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I am having a new mission to achieve and I really need some pro-Windows system to help me with their advices. I have a server which requires high availability of data and service. Basically the server run a server/client service and all clients makes their operation over this server. The server is a simple Windows 2003 Web Edition server. My goal is to have one server running (let’s say Tom with IP 192.168.0.1) and one running as stand-by (let’s say Jerry with IP 192.168.0.2) ready to take over if the first server crashes (this would remind pro-Linux some kind of DRBD and Heartbeat server). So, the the first server run without problem, all transactions are going to be written in the directory “D:/Transactions”. This directory must be saved in real-time to the second server which stands in case of failure... The first server also run a Windows service, which has to be stopped on the stand-by server and started ONLY if the first server is not working anymore. I would like also the two servers (Tom and Jerry) to share a virtual IP address on the one which is having the service running, let’s say this IP would be 192.168.0.3. When the first server goes offline hung or whatever, the second server take over, start the service and does the job of the first - when the first come back online, I re-sync the data from the second to the first and then, I switch it back (or all this fully automated if possible). NOTE: the service that I need to run is special and is not one of the normal basic Microsoft service, it’s an in-house written service. My question are : - What software(s) do I need to do this ? - Is there anything that I should be aware of ? - Is there some provider (on both east and west) cost which can provide me help for the hardware part of this project ?
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My Server Is Very Slow, High CPU, High Apache Load
My server is very slow, High CPU, High Apache load.... I got a new server and i had setup a script on it. No server tweaks has been done. I run a filehosting site so it gets very slow when traffic is high. Here is some info: Code: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 4135 filedip 19 0 12812 8892 2212 R 18.9 0.4 0:00.74 index.cgi 3140 apache 15 0 22624 9604 2768 S 17.3 0.5 1:54.45 httpd 3556 apache 15 0 22792 9592 2768 S 17.3 0.5 0:43.53 httpd 3739 apache 15 0 22672 9556 2744 S 17.3 0.5 1:09.67 httpd 3884 apache 15 0 22664 9560 2744 S 17.3 0.5 0:23.98 httpd 3474 apache 15 0 22672 9572 2756 R 16.1 0.5 1:34.09 httpd 3548 apache 15 0 22792 9560 2740 S 16.1 0.5 1:33.67 httpd 3991 apache 15 0 22640 9588 2756 S 15.1 0.5 0:22.44 httpd 3475 apache 15 0 22672 9580 2756 S 13.2 0.5 1:31.42 httpd 3493 apache 15 0 22664 9592 2768 S 12.9 0.5 1:15.52 httpd 3769 apache 15 0 22664 9580 2756 S 12.9 0.5 0:45.19 httpd 3638 apache 15 0 22664 9576 2756 S 12.3 0.5 0:32.82 httpd 3724 apache 16 0 22664 9580 2756 R 12.3 0.5 0:34.25 httpd 3626 apache 15 0 22672 9580 2756 S 11.7 0.5 0:52.54 httpd 4023 apache 16 0 22792 9560 2740 R 11.3 0.5 0:13.16 httpd 3882 apache 15 0 22664 9576 2756 S 10.1 0.5 0:38.56 httpd 3005 apache 15 0 22672 9588 2768 R 9.1 0.5 2:06.61 httpd I dont know much about server managment... how to fix this so server doesnt go slow?
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I have a cPanel server with 4GB RAM My server hangs time to time, once or twice a day. This is the last status when it happens. Server Load 75.90 (2 cpus) Memory Used 92 % Swap Used 65.78 % When I was still inside SSH when it happens, the processes I can see inside "top" are a lot of httpd processes. So I "killall -9 httpd", I had to do it 30~40 times #killall -9 httpd #killall -9 httpd #killall -9 httpd x 30~40 times until no pid process found & the server load is back to normal. Before that, I check httpd fullstatus, they look very normal, same goes to what I see inside WHM Apache status & cpu usage status. At first I thought it was a memory problem after consulting with a server admin, so I replaced all 4GB new ram stick (such a waste)
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Building, Running & Managing Your Own Server Farm
Building, running and managing your own Server Farm. This thread is dedicated to those who find themselves on or considering this path. Here, I am not hosting any ‘foreign business interests’ or associating with any other ‘hostile networks’. I am needing to create many sub-nets, with 3 to 5 WAN’s inbound and outbound. I have a ‘research sub-net’ needing special considerations and will link associates/contractors by VPN. The product-line will also require Radius Server(s). Plus more details and requirements that make the whole project most complicated. (Thanks to ‘leeware’ for this beginning theme) 1.0 Objective: Building a 30-50 Server facility: I checked my records and made this decision 2 - ˝ months ago. Since then I have acquired 28 servers, an internet security device, two 3com’s, two 4-port kvm’s, a few small Cisco switches and a host of power related stuff. 2.0 Justification for Building vs leasing: Control. Costs. Open options. Unique demands more easily appreciated by myself as I am the one possessing the vision. Choosing who I work with as I do the hiring/contracting or initiate associations. We are generally molded by personal experiences and these set-up our prejudices. I am certainly no exception. My experiences with hosts generated an excellent introduction to the wide world of websites/control panels etc and some products that support it. But the too often cryptic communications, some surprise costs due to my ignorance and that vulnerable ‘boxed in’ feeling made me wonder… 2.1 What is your rational for building vs leasing? One of my major ‘cross the line’ rational came when I discovered I could buy a used server each month for a similar cost of leasing one. Next, were all my own confounded ‘special circumstances’ that kept cropping up and of course these were not the fault of any hosting company. Lastly technology came to my street in the form of good multiple pipes and my zoning is acceptable because I am off a major highway. 3.0 Business Objectives: My business objectives center around a very long-run project that I have already long ago completed and keep updated to viability. And I would rather keep that subject to another venue. 4.0 Budgetary Information: I have enough ‘resources’ to pull it off. 4.2 What is your operating budget (How much money do you plan to spend on an ongoing basis to keep the place running for 12-24 months?) Same as previous and I will note that ‘time and attention’ is keenly important. 4.3 More importantly, where is this money going to come from? If from investors they generally require a sound business plan. I require a sound business plan and have it. 5.0 Return on Investment: Accomplish goals on and on… 5.1 After you account for the initial capital expense to get everything up and running + your on going operating costs, how long will it take you to make back your initial investment and then reach profitability? (12/24/36 months for longer?)
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