[gpfsug-discuss] RAID type for system pool
Marc A Kaplan
makaplan at us.ibm.com
Thu Sep 6 16:20:43 BST 2018
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...
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20180906/777f03ce/attachment-0002.htm>
More information about the gpfsug-discuss
mailing list