#ZFS RAID LEVEL OPENZFS SOFTWARE#
#ZFS RAID LEVEL OPENZFS FREE#

Performance is identical to a RAID10, but the chance of losing your pool is much higher. It stripes data across pools of disks than mirrors those pools. RAID01 is the same as a RAID10 but backwards. RAID10 in ZFS is simply striping mirrored VDevs. All the data is stored twice, so there is only half the effective capacity of a RAID0 (just like RAID1!). The only way a RAID10 really lacks in is efficient use of its capacity. It has the redundancy benefit from the RAID1's and the performance benefit of a RAID0. Drives get mirrored together, than across the top, each mirrored pair gets striped across the whole set to create a single virtual drive. RAID10 is just mirroring and striping used together. It is used rarely when data security is a top priority. 3 parity blocks instead of two means it can withstand 3 drive failures and still rebuild. ZFS also has RAIDZ3, which is exactly what it sounds. Just like RAIDZ1, RAIDZ2 doesn't face the write-hole phenomenon that RAID6 normally does without some sort of solution implemented.

It is a fairly safe RAID level because it has the ability to withstand two drive failures and still rebuild, meaning if one fails you can still withstand another drive failure before or while rebuilding without losing your pool. RAID6 - RAID 6 is similar to RAID5 but with two drives worth of parity instead of one. RAIDZ1 has a benefit over RAID 5 as it has solved the write-hole phenomenon that usually plagues parity and striping RAID levels. RAID5 protect your data against one drive failure, but if another goes out before rebuilding it the whole pool could be lost. It is one of the most popular RAID levels because of its combination of performance and data security. It also performs the same data striping across drives for the added performance benefit of RAID0 (the parity data is also striped across the disks, so you are not limited by the speed of a dedicated parity drive). RAID5 uses a parity block which gives it the ability to rebuild the lost data if a drive fails. RAID1 is often used in conjunction with other RAID levels or for boot drives as its space efficiency is worse than the parity RAID levels. With ZFS you can mirror them as many times as you want to help protect against drive failure, this would result in more and more wasted space for the extra protection of an extra possible drive failure per mirror. On ZFS this would simply be done by mirroring between VDevs. RAID1 - This level mirrors data between drives to essentially have a local backup of all your data. It will still cause the pool to be lost if there is a disk failure though, so this is not a good level for anyone who doesn't mind a big risk of losing all their data. In case of a drive failure, your whole storage pool could be lost! ZFS calls this a striped VDev and has slightly more protection against silent data corruption than a standard RAID0 because of its self-healing with checksums. It is the highest preforming, most space efficient RAID level, but gives no data security. RAID0 - Also known as Striping, RAID0 spreads your data across multiple drives to get the added speed of them all reading and writing together. When you join together multiple VDevs you make a 'zpool' after which the VDevs cannot be removed. It uses smaller RAIDs in partitions called 'VDevs' (virtual devices).

ZFS has functionally similar RAID levels as a traditional hardware RAID, just with different names and implementation. This article outlines what every relevant RAID level does, and what its equivalent would be inside ZFS. They are functionally identical to normal RAID levels, with the only minor differences coming from ZFS's increased resiliency due to the nature of its architecture.

#ZFS RAID LEVEL OPENZFS SOFTWARE#

ZFS has its own names for its software RAID implementations. FreeNAS® uses the file system ZFS, which is not exclusive to FreeNAS® but is an extremely powerful file system, volume manager and software RAID controller in one.

#ZFS RAID LEVEL OPENZFS FREE#

They provide free and open-source enterprise grade network attached storage software. Developed by its community and owned by IXSYSTEMS®, FreeNAS® is the number one storage operating system in the world.

Zfs raid level openzfs