Chapter 6.5. Adding MDisks to existing MDGs
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88 SAN Volume Controller: Best Practices and Performance Guidelines be reduced to the level of the poorest performing MDisk. Likewise, all LUNs need to also possess the same availability characteristics. Remember that the SVC does not provide any RAID capabilities. Because all MDisks are placed in the same MDG, the loss of access to any one of the MDisks within the MDG will impact the entire MDG. We recommend these best practices for LUN selection: Must be the same type Must be the same RAID level Must be the same RAID width ( number of physical disks in array) Must have the same availability and fault tolerance characteristics MDisks created on LUNs with varying performance and availability ...
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