Linux, DevOps, Middleware and Cloud

Difference between RAID 0+1 vs RAID 1+0? We have covered RAID levels before in our posts. You can read about the different RAID levels here and the I/O characteristics here.  While building up a DR (Disaster Recovery) environment for one of our clients, one of the questions asked by the client was: “How is RAID 1+0 different than RAID 0+1?”.  Both RAID 0+1 and RAID 1+0 are multiple RAID levels which means that they are created by taking a number of disks and then dividing them up into sets. And within each of these sets, a single RAID level is applied to it in order to form the arrays.  Then, the second RAID level is applied at the top of it to form the nested array.  RAID 1+0 is also called as a stripe of mirrors and RAID 0+1 is also called as a mirror of stripes based on the nomenclature used for RAID 1 (mirroring) and RAID 0 (striping).  Let’s follow this up with an example: Suppose that we have 20 disks to form the RAID 1+0 or RAID 0+1 ar...

What RAID is Best for You? Most of you are familiar with the basic RAID technologies avaible out there today, but it is always good to have too much information about this topic than not enough. Here is a brief yet informative summary of the most popular hardware RAID configurations, including pros and cons for each: RAID-0 (Striped) Does not provide fault tolerance Minimum number of disks required = 2 Usable storage capacity = 100% This is the fastest of the RAID configurations from a read-write standpoint Is the least expensive RAID solution because there is no duplicate data Recommended use for temporary data only RAID-1 (Mirrored) Fault tolerant – you can lose multiple disks as long as a mirrored pair is not lost Minimum number of disks required = 2 Usable storage capacity = 50% Good read performance, relatively slow write performance Recommended for operating system log files RAID-5 (Striped with Parity) Fault tolerant – can afford to lose one disk only Mi...