RAID stands for Redundant Array of Independent Disks and is a way to combine multiple hard drives into one large storage drive. RAID controllers are used to manage the data on these drives, allowing them to be accessed as if they were all part of one large disk.
The levels of RAID that a RAID controller card supports depends on the particular model; there are four primary levels: 0, 1, 5 and 6. In addition, some cards may also include support for other types such as 10 or 50.
RAID 0 is known as striping, meaning data is spread across both disks in an interleaved manner so that read/write performance can increase significantly compared to using just one disk. However, this comes with no redundancy—if either disk fails then all data will be lost as it would be impossible to recover from the remaining drive. This makes RAID 0 best suited for use cases where speed and capacity are more important than reliability and durability (such as video editing).
What levels of RAID does the RAID controller card support? Which RAID level is best to use?
RAID 1 provides mirroring–data written on one disk is simultaneously written on the other so there’s always an exact copy available if anything goes wrong with either drive. As a consequence though this uses up twice the amount of space and any read operations require both disks working at once which can slow down performance depending on their type and speed. This level however offers great reliability so could be suitable for applications where data integrity matters most such as financial records or databases.
RAID 5 allows multiple disks to work together but only requires enough space equal in size to one single disk out of those being used–the others help store parity information about each block which can then later be used to reconstruct any missing pieces should something fail unexpectedly here like in RAID 1 but without taking up double the capacity like having two mirrors would do. It’s still not ideal though because having multiple failures before replacement parts arrive can easily result in catastrophic loss due to not being able to rebuild it properly anymore (known as write-hole). raid 5 Is typically good for general purpose use cases since it offers good tradeoffs between cost effectiveness, performance gain over single-disk setup plus data loss protection yet limited by its susceptibility towards losing more than just individual files when many disks die concurrently within short period time frame before you get around replacing them back again safely inside array set configuration limits while rebuilding process going along seamlessly henceforth afterwards until next incident arises eventually requiring same repair work cycle routine thereafter anew again ultimately speaking overall here. Finally there’s RAID 6 which works similarly except now two separate sets of parity bits are stored across all included devices making it possible even after multiple simultaneous failures occur still have chance recovering everything else.