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It is both a ",[395,396,397],"em",{},"file system"," (like NTFS for Windows, EXT4, FAT32, etc.) and a ",[395,400,401],{},"volume manager"," (similar to LVM).",[391,404,405],{},"To put it simply:",[407,408,409,417],"ul",{},[410,411,412,413,416],"li",{},"A ",[414,415,401],"strong",{}," organizes physical storage (like one or more hard drives).",[410,418,412,419,421],{},[414,420,397],{}," organizes how data blocks are written, read, and deleted within those volumes.",[391,423,424,425,428],{},"ZFS goes far beyond traditional file systems in terms of performance and features.",[426,427],"br",{},"\nHere’s what we’re most interested in:",[407,430,431,438,449,455,458],{},[410,432,433,434,437],{},"Its ",[414,435,436],{},"snapshot management"," features, allowing you to quickly roll back in case of issues.",[410,439,440,441,448],{},"Its support for disk groupings and ",[442,443,445],"a",{"href":444},"\u002Fgeneral\u002Fstorage\u002Fraid",[414,446,447],{},"RAID-like structures"," (Z-Mirror, RAIDZ1, RAIDZ2, RAIDZ3).",[410,450,433,451,454],{},[414,452,453],{},"automatic recovery of corrupted data"," (through scrubbing).",[410,456,457],{},"Its performance, enhanced by RAM caching (ZFS ARC).",[410,459,460],{},"Its robust error notifications and monitoring.",[462,463,465],"h2",{"id":464},"structure","Structure",[391,467,468],{},[469,470],"img",{"alt":471,"src":472},"","\u002Fimg\u002Fglobal\u002Fzfs.svg",[391,474,475],{},"ZFS has a unique structure:",[407,477,478,484,490],{},[410,479,480,483],{},[414,481,482],{},"vdev"," (virtual device): a group of physical or virtual disks.",[410,485,486,489],{},[414,487,488],{},"zpool",": a collection of vdevs configured as a single storage pool. A zpool can contain multiple vdevs, but a vdev belongs to only one zpool.",[410,491,492,495],{},[414,493,494],{},"dataset",": a logical data container within a zpool. Each dataset can have its own settings (compression, quotas, permissions, etc.).",[391,497,498],{},"There are several dataset types:",[407,500,501,506,512],{},[410,502,503,505],{},[414,504,397],{},": a standard ZFS filesystem, mounted without storage quotas.",[410,507,508,511],{},[414,509,510],{},"zvol",": a \"virtual disk\" with a defined size, which you can format and partition as if it were a physical disk.",[410,513,514,517],{},[414,515,516],{},"snapshot",": a frozen-in-time version of another dataset. Snapshots can be created manually or through backup tools. They can be mounted to browse data as it was at the snapshot time.",[462,519,521],{"id":520},"why-zfs-over-others","Why ZFS over others?",[523,524,526],"h3",{"id":525},"data-integrity","Data Integrity",[391,528,529],{},"ZFS continuously checks that your stored data hasn't become corrupted. Every block of data is associated with a checksum, allowing ZFS to detect even the smallest alteration. If corruption is found and a healthy copy exists elsewhere, ZFS can repair the data automatically.",[523,531,533],{"id":532},"built-in-raid","Built-in RAID",[391,535,536,537,539],{},"ZFS includes its own volume management system (vdevs). You can build a zpool using multiple disks, similar to traditional ",[442,538,51],{"href":444}," setups, but with more flexibility. For example:",[407,541,542,548,554,560],{},[410,543,544,547],{},[414,545,546],{},"Z-mirror"," → equivalent to RAID 1",[410,549,550,553],{},[414,551,552],{},"RAIDZ1"," → equivalent to RAID 5 (tolerates 1 disk failure)",[410,555,556,559],{},[414,557,558],{},"RAIDZ2"," → equivalent to RAID 6 (tolerates 2 disk failures)",[410,561,562,565],{},[414,563,564],{},"RAIDZ3"," → tolerates up to 3 disk failures",[391,567,568],{},"ZFS handles all this natively: no external RAID software needed.",[570,571,572,573,576],"note",{"to":444},"Check out the ",[414,574,575],{},"article on RAID"," to find the right solution for your needs.",[523,578,580],{"id":579},"snapshots-and-clones","Snapshots and Clones",[391,582,583],{},"ZFS allows you to create snapshots: instantaneous images of a dataset's state. Snapshots take up minimal space and can be scheduled frequently. You can also create clones: writable copies of snapshots.",[523,585,587],{"id":586},"compression-and-deduplication","Compression and Deduplication",[391,589,590],{},"ZFS can compress data on the fly (transparently to the user), saving disk space. 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