What is ZFS. (a paste from wikipedia)
ZFS is a combined file system and logical volume manager designed by Sun Microsystems. The features of ZFS include protection against data corruption, support for high storage capacities, efficient data compression, integration of the concepts of filesystem and volume management, snapshots and copy-on-write clones, continuous integrity checking and automatic repair, RAID-Z and native NFSv4 ACLs.
Advantages of ZFS.
Data integrity guaranteed.
ZFS has volume management on filesystem level, this enables copy on write. When a data block changed, it will change its location on the disk before the new write is complete. If you have a crash, that data would be damaged. ZFS does not change the location of the data until the write is verified, which means that your data is safe during a crash. ZFS also use checksums to ensure that all data is correct, every write is tested. ZFS doesn't just protect data with copy on write, it also offers additional protection by having an additional RAID level. RAID-Z3 which allows a maximum of three disk failures in a ZFS pool. Traditional RAID levels only allow two disk failures per volume. ZFS offers RAID mirrors who are usually composed of a single disk keeping its own copy. With a multi-disk mirror you can have multiple copies, which adds levels of data integrity not found in traditional RAID setups and it's also great for reads.
ZFS also allows to send writes to individual disks, instead of just the whole RAID volume. Because of this, ZFS can spread writes which is speeding up write performance. It also has algorithms that ensure that the most frequently used data blocks are kept in the fastest media, meaning that you can have just a few SSD drives as cache.
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