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Had identical problem, after examining DSET logs while issue was present and then after cold boot fix, Dell support claimed power surge, server powered by APC 1500kVA SmartUPS at the time. Dell support recommended cold boot to reset sensors (power unplugged, hold down power button for more than 3 seconds). Support also suggested patching iDrac to ...


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flush-8:0 is kernel thread, works on flushing dirty RAM buffer and/or swap to disk, jbd2/sda2-8 is kernel thread, that is working with journaling on filesystems - they're intensive IO are results, not reasons of your problem. more looks like your problem is heavy usage of disk by mysql. while JBD is in use - looks like multiple write operations are in ...


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This may not be the best answer, but I would configure some monitoring platform like Nagios to watch the servers. Stuff like this happens all the time, and if this is a client, you need to know there's an issue before the users do. I have used Nagios for years to watch my servers, and it sends emails if there's anything that goes sideways. I have configured ...


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Difference between "pre-compiled" and "not pre-compiled", is that the "not precompiled"'s site pages will get dynamically compiled upon first request to each of those pages by .net compiler (csc.exe/vbc.exe, you can actually see them popup in task manager's processes tab). So each page will take a one time hit of compilation time, though usually its ...


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i would choose minimal. The less data-garbage and services are installed the less the server will have to do useless thinks you don't really need... if you miss some packages in minimal installation install them aferwards.


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It's an asp/c# app? You can check in C:\Windows\System32\Logfiles\HTTPERR for IIS errors, and in w3c logs for timing.


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I know this is old, but a very important factor to take into consideration is disk I/O. If the disk write performance is incredibly slow due to software / motherboard RAID as opposed to a hardware-based RAID card with dedicated memory. Network load is a factor, but the best thing to do as a sysadmin is look at Resource Monitor and inspect where the ...


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From security perspective I believe these would likely be the same. If the service is stopped, the port will be closed and will reject connections. You probably also want to make sure that your firewall rules block access to the NFS ports as well. That said, uninstalling would mean you couldn't accidentally/inadvertently restart the service. From a ...


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Im doing this on 3 server, 1 is our and 2 customers. Ive setted it up for various reason - one server 2008R1 have many updates pending for install, but I cannot batch install them, so im installing it one by one every day; another server 2012R2 - for boot troubleshooting and some performance issues etc. I don't think that's a bad practice to schedule a ...


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"Best" is dependent, of course, but there are a few well known ways to boost IO performance on AWS. RAID0-together a bunch of General Purpose SSD EBS volumes. A few, large, provisioned IOP EBS volumes. If you're doing sequential work, use the 640GB of Instance Local storage you have with that type. A combination of the above three points. All of the ...


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Although an answer has been accepted here, I strongly disgaree that it's the right way to go. Unless you have complex deployment and/or capacity testing requirements, then why are you paying for a server to host your non-production stuff? All you need is a local VM (it's trivial to implement bandwadth, latency and packet loss on a proxy). Even VPs go down. ...


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I would approach this project with a CentOS 6 installation. There are a few considerations: Within the lifecycle of the upstream Red Hat product, EL6 has just reached the maturity and stability that I require for my production environments. It's still a distribution that has access to a good package set, deep mindshare and wide usage. Plus, you always have ...


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I would always recommend that new projects start out with the latest available OS version, unless there's some overriding need to not do so. The big stumbling block you may run into is that EL7 cut out a lot of drivers for older hardware, and since you propose to use some rather old hardware here, you may find that you can't install the operating system. In ...


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After contacting support, this is the answer they gave: RXTX Factor Aggregate outbound bandwidth, in megabits per second, across all attached network interfaces (PublicNet, ServiceNet, and Cloud Networks). Outbound public Internet bandwidth can be up to 40% of the aggregate limit. Host networking is redundant, and bandwidth is delivered over two ...


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It's far from clear but I'm reasonably certain that it's the ratio of how much bandwidth there is available for both receiving and transmitting. For instance a machine with no limitations would have a RXTX factor of 100, whereas a machine that could only receive half of what it could transmit would be 200. Basically it's just rate-limiting on the network and ...


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You are comparing a 6-year old server to a 3 year old PC with a much faster clocking. If you can tune your DB so it will use all cores you will propably solve your local performance problem. I do not think you have an IPC issue.


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Apache already has this built in. %D The time taken to serve the request, in microseconds. There are more aspects of timing covered in Apache's mod_log_format page. There are a few other options on that page you could use together to get very accurate calculations.


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Also Oracle Server Seam to adapt to expected loads rather than current load. So if you utilize the servers differently you will get different caching behavior. Also check the execution plans carefully. If there is a slightly different execution on the big select like an skip scan instead of aindex scan it might explain everything.


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The first thing I would do is reduce the likelyhood that any of those processes can take more CPU or disk IO time than the OS. I am going to assume your OS is linux. Be sure to back up any config files before editing them. You may be able to get some hints to the OS behavior just prior to the crash by looking at sar data. sar -A | more Be sure to look ...


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The problem is resolved! The issue was extremely difficult to diagnose because it happened irregularly, and, while not infrequently, not frequently either (yes, that's a contradiction, I'll live with it). Eventually the issue seemed to be getting worse, and affecting other aspects of our connection, and I was able to catch it in dropped pings and such, and ...



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