Migrating arrays within the same storage subsystem
Important
1.
Ensure that your controller firmware is at or above the level shown in Table 2
on page 5. Do not rearrange more than one array at a time.
2.
Unmount the file systems to flush I/O from the server cache to disks.
Note:
a.
In a Microsoft Windows environment, remove the drive letter or the mount
points of the mapped LUNs instead of unmounting the file systems.
b.
See the documentation for your operating system for detailed information
about the unmount procedure.
3.
Export Array and Import Array functions are available on storage subsystems
or storage enclosures with controller firmware level 7.xx or later and Storage
Manager software version 10.xx or later.
Note:
Because disk pool does not support exporting and importing functions,
this functionality is not applicable to drives in disk pools.
Using the configuration data on existing drives, you can redistribute the drives
that make up a RAID array across a storage subsystem to which you might be
adding storage enclosures. Figure 3 illustrates a storage array that is distributed
across three drives on a single storage device before and after reordering. When
you redistribute each drive to a different position in the same storage enclosure,
which is a best practice, the array is automatically redistributed.
Figure 4 illustrates a storage array that is distributed across three drives on a single
storage device before reordering across two storage devices. When the drives are
redistributed across an additional storage enclosure in the storage subsystem,
which is a best practice, the array is automatically redistributed.
Figure 5 on page 22 illustrates two arrays that are distributed across five drives
and two storage enclosures before and after reordering the same drives across
other drive bays in the same two storage enclosures.
Note:
1 2 3
4 5 6
Before
After
Empty slot
Drive associated with array
Figure 3. Best practice for reordering a defined array by using empty bays in one storage
enclosure
1 2 3
1 2
3
Before
After
Empty slot
Drive associated with array
Figure 4. Best practice for reordering a defined array by using empty bays in two storage
enclosures
Chapter 2. Adding or migrating hard disk drives
21
Summary of Contents for System Storage DCS Series
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