![]() Finally, you cannot shrink (reduce) XFS file systems in size, so you should take extra care to not over-allocate storage to an existing file system.įor more information about shrinking, see How to reduce XFS file system.įor detailed information about the size limits of filesystem, files, and directories, see the File systems and storage section of the Red Hat Enterprise Linux technology capabilities and limits article. XFS has a relatively poor performance for single threaded, metadata-intensive workloads, for example, a workload that creates or deletes large numbers of small files in a single thread. XFS also performs well on smaller systems that have a multi-threaded, parallel I/O workload. For instance, a large system would be one with a relatively high number of CPUs, multiple HBAs, and connections to external disk arrays. Given its long history in environments that require high performance and scalability, it is not surprising that XFS is routinely measured as one of the highest performing file systems on large systems with enterprise workloads. While XFS scales to exabytes, Red Hat’s maximum supported XFS file system image is 100TB for Red Hat Enterprise Linux 5, 300TB for Red Hat Enterprise Linux 6, and 500TB for Red Hat Enterprise Linux 7. Optimizations for streaming video workloads.Tightly integrated backup and restore utilities.Sophisticated metadata read-ahead algorithms.Extensive run-time metadata consistency checking. ![]() ![]() Ability to support a large number of concurrent operations.B-tree indexing for scalability of free space management.XFS supports a wealth of features including the following: XFS was originally developed in the early 1990s by SGI and has a long history of running on extremely large servers and storage arrays. Journaling ensures file system integrity after system crashes (for example, due to power outages) by keeping a record of file system operations that can be replayed when the system is restarted and the file system remounted. It is the default file system in Red Hat Enterprise Linux 7. XFS is a robust and mature 64-bit journaling file system that supports very large files and file systems on a single host. When considering a file system choice, you should consider how large the file system needs to be, what unique features it should have, and how it performs under your workload. The most notable differences from a user’s perspective are related to scalability and performance. From the application programmer’s point of view, there are relatively few differences. POSIX-compliant file systems provide support for a well-defined set of system calls, such as read(), write(), and seek(). The newest version of the Ext file system family, Ext4, is fully supported in all versions of Red Hat Enterprise Linux since 5.6.Īll of these file systems are POSIX compliant and are fully compatible with all later Red Hat Enterprise Linux releases. The Red Hat Enterprise Linux 4 and Red Hat Enterprise Linux 5 platforms have traditionally provided two main file systems for the Ext2 and Ext3 class of systems. Local file systems are also the most common file systems used on SAN attached storage when the SAN’s exported device is not shared. For example, a local file system is the only choice for internal S-ATA or SAS disks and is used when your server has internal hardware RAID controllers with local drives. Local file systems are file systems that run on a single, local server and are directly attached to storage. Shared storage or shared disk file system.At the most general level, file systems available in Red Hat Enterprise Linux can be grouped into the following major categories: Different types of file systems solve different kinds of problems, and their usage is application specific. Red Hat Enterprise Linux supports a variety of file systems. This paper describes some of the file systems that ship with Red Hat Enterprise Linux and provides historical background and recommendations on the right file system to suit your application. Choosing Between Network and Shared Storage File SystemsĬhoosing the Red Hat Enterprise Linux file system that is appropriate for your application is an important decision due to the large number of options available and the trade-offs involved.
0 Comments
Leave a Reply. |