For example, an application that works with a large and relatively fixed data set of hundreds of megabytes or even dozens of gigabytes can have performance issues when using 4 KB pages. Such data sets can require hundreds of thousands of 4 KB pages, which can lead to overhead in the operating system and the CPU.
Red Hat Enterprise Linux 7 enables the use of larger page sizes for applications working with big data sets. Using larger page sizes can improve the performance of such applications. Determining the absolute minimum required RAM for your specific use case therefore requires you to test various configurations, and periodically re-test with each new release.
However, if you use a Kickstart file that runs commands which require additional memory or write data to the RAM disk, additional RAM might be necessary. The first number is the tested limit, which is the maximum quantity that Red Hat's engineering and technical support teams have verified as fully functional for a given parameter.
Certified systems are expected to behave correctly up to that limit. The second number is the theoretical limit, the maximum value the kernel and userspace, if applicable, should be able to support based on the current source code. Before this you should also ensure that the server hardware is certified with RHEL 6.
Hi Deepak, Thanks for your replay. From the point of view of the operating system, every path to a LUN is a separate device. As a result, we specify the max. For the purpose of specifying the max. Although it is possible for a physical volume to have multiple filesystems or logical volumes on it, and the theoretical max. I think we should change this to be at least 1. The same kickstart file worked fine under RHEL 7.
Anaconda in RHEL 8. I had to bump the memory to 3GB in order for the installation to proceed, otherwise I saw the famous "Pane is dead" error. Officially support CPUs across the entire machine. Please search the catalog to locate the model of interest. If it's not listed, then it may not have been certified by your favorite vendor. You can also cross reference the RHEL certification with the vendor's support website.
Red Hat Enterprise Linux 7. Can someone please point me to a list that shows the supported processor listing? Should these values be swapped? Additionally, it has only these numbers, without a separate theoretical limit. What has RHEL 8 been tested to, and what is its theoretical limit? If only the theoretical limit is available, it would be helpful to denote this in the table, either by enclosing the values in brackets, by adding a footnote, or both.
The file size vs file system size numbers are correct. The file size here refers to maximum file offset, not actual space consumed, i. A footnote would be helpful here to avoid confusion..
Theoretical limits remain the same as prior versions 8EB file size, 16EB filesystem size. I'll get the theoretical limits added on the RHEL8 column. As an aside, simple statements of these theoretical sizes for filesystems can be tricky; in reality, these maximums tend to depend on fs block size, and in turn on system page size, but that level of detail can be difficult to provide in a table like this.
The limits quoted here are tested limits, and that defines the limits of our support. In some cases those coincide with theoretical limits. Both the maximum file size and maximum file system size are stated correctly.
You would need a sparse file in order to approach the maximum file size limit, of course, since the maximum file system size is smaller. We could add theoretical limits, but I'm not sure that is useful, if it comes without support and might even be confusing. If you need a larger limit than those stated here, it would be best to open a support case and request it. We are always happy to provide advice and understanding requirements from customers helps us set the limits for our testing and support.
The max file system size can't be inferior to a max file. Those limits are correct. The reason that a file can be larger than the filesystem is that files can be sparse, so they don't need backing with blocks on the filesystem in that case.
Many beginners struggle with knowing their system well in context to resources like CPU, Memory, disks, etc. The first command is free. This is the simplest command to check your physical memory. Using different switch you can change the byte-format of output. Like -b for bytes, -k for kilobytes, -m for megabytes and -g for gigabytes. Check row with Mem: and number against it.
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