![]() ![]() ![]() In addition to saving the most recently used data, which most operating systems do, ARC also weights the data by how frequently it is being used and stores it in RAM. Rather than relying on your operating system‘s page cache ZFS has a separate caching mechanism. As metadata update is performed in a single operation, your system may crash in the middle of the writing process and still maintain filesystem consistency leaving you either with the old, or with the new version of a file. In contrast to a traditional filesystem, every time you modify a file ZFS writes new blocks to the filesystem and, when the writing is done, ZFS updates the file‘s metadata pointers to unlink the old blocks and link to the new blocks of data. For instance, the default block size of PostgreSQL is 8 kilobytes, so fetching bigger blocks from the file system may be a waste of disk bandwidth. While changing the block size will have an effect on new files only, it can have a performance impact depending on your application. The default block size of ZFS is 128 kilobytes, but you may change it anytime. Even more, such deduplication granularity ensures that if you have a file consisting of several data blocks and you try to save the same file with a single byte changed, only this single block with a changed byte will be written on a filesystem. If you try to store the same file to the same zpool twice, only a single file will be stored. ZFS provides deduplication on a data block level. For instance, a theoretical maximum size of a zpool is 256 quadrillion zebibytes (2128 bytes), your zpool can consist of a maximum number of 264 devices, and store files up to 16 exbibytes (264 bytes) large. The maximum storage capacity of ZFS is designed to be so large that it shouldn‘t ever be encountered in practice. Let’s go through some of the benefits of ZFS. It always helps to know how exactly a technology can help you before deciding to use it. ZFS has a gazillion of handy features that make it a distinct file system. In this article we are going to use Ubuntu 22.04 to show how you can set up ZFS for a PostgreSQL database service. In addition to being a solid choice for many system administration workloads, ZFS is widely accessible on a variety of operating systems, including Linux, FreeBSD, Illumos, Mac OS and Windows. ZFS is unique by its awareness of the underlying structure of the disks, allowing it to grow automatically when adding new disks to the storage pool. Zettabyte File System (ZFS) is a local file system with an integrated volume manager that shines as one of the most robust, scalable, and easy-to-administer file systems available today. ![]()
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