[gpfsug-discuss] RAID type for system pool

[Marc A Kaplan]

Perhaps repeating myself, but consider no-RAID or RAID "0" and

-M MaxMetadataReplicas
Specifies the default maximum number of copies of inodes, directories, and 
indirect blocks for a file.
Valid values are 1, 2, and 3. This value cannot be less than the value of 
DefaultMetadataReplicas. The
default is 2.

SO you can have triple redundancy with no shared  physical point of 
failure.

When you depend a particular RAID controller to do replication and 
subsequent recovery for you, then you are depending on that RAID 
controller. 

Of course, when you take this point of view to the extreme, you realize 
that for any individual datum you are depending on the single generator or 
source of that datum being correct, the OS and filesystem software and 
CPU, etc, etc.... Until you get to the point just beyond where the datum 
is replicated... 

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