How can I make a RAID of more than 27 EtherDrive blades?
For Linux Software RAID, the kernel limits the number of disks in one RAID to 27. However, you can easily overcome this limitation by creating another level of RAID. For example, to create a RAID 0 of thirty disks on EtherDrive blades, you may create three ten-disk RAIDs (md1, md2, and md3) and then stripe across them (md0 is a stripe over md1, md2, and md3). Here is an example raidtools configuration file that implements the above scenario for shelves 5, 6, and 7: multi-level RAID 0 configuration file. Non-trivial raidtab configuration files are easier to generate from a script than to create by hand. The EtherDrive storage gives you a lot of freedom, so be creative.
