I just ran into a document stating that RAID 10 is not equal to RAID1+0 . Below is what she said :
There is little documentation on Linux's RAID 10, or how it differs from RAID 1+0. Fortunately, some readers passed on some good information on what RAID 10 is, and what sets Linux's implentation apart. First of all, never mind that everyone says that RAID 10 and 1+0 are the same thing and that even man md says this — they're not the same. RAID 10 is a new type of array; it is a single array, it can have an odd number of drives, and the minimum required are two. RAID 1+0 is a combination of multiple arrays, it requires at least four disks, and must always have an even number.
Below is the comparison:
Linux RAID 10 needs a minimum of two disks, and you don't have to use pairs, but can have odd numbers. You can read all about it in Resources, so I'll sum up the basic differences:
* RAID10 provides superior data security and can survive multiple disk failures
* RAID10 is fast
* RAID10 is considerably faster during recovery— RAID5 performance during a rebuild after replacing a failed disk bogs down as much as 80%, and it can take hours. RAID10 recovery is simple copying.
* RAID5 is susceptible to perpetuating parity and other errors
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