Datasheet

8068ch08-Storage Pools.fm Draft Document for Review January 29, 2013 12:52 pm
312 IBM Flex System V7000 Storage Node Introduction and Implementation Guide
Figure 8-21 Configuration complete with performance optimized setup
With the performance optimized setup the IBM Flex System V7000 Storage Node
creates MDisks, each containing eight drives. Additional drives remain unconfigured,
as they did not meet the goal of eight drives for a Basic RAID 5 array to create another
performance optimized MDisk. The progress of the array initialization process is
displayed in the Running Tasks status indicator, and the capacity allocation indicator
has been updated as well.
– Optimize for Capacity:
The goal of this algorithm is to create a setup with the maximum usable capacity,
depending on the selected RAID level.
While creating arrays, the IBM Flex System V7000 Storage Node system attempts to
fulfill the
width goal (Table 8-2 on page 305) for each array before creating another
one. This setup is an example with 18
unused drives, Select a different configuration
was chosen with the following options:
• Preset: Basic RAID-5.
• Automatically configure spares was checked.
• Optimize for capacity.
The results are as follows:
• One hot spare drive is defined.
• Three basic RAID 5 arrays are created. Two of the arrays contain six drives and one
array contains the remaining five drives.
• No unused drives are left.
The
width goals for the array can not be accomplished as too little drives are available.
Instead the system provisions the available drives in even sized MDisks. In our case we
get two MDisks with six disks and one with only five.