Using The Ssa_Make_Copy Command To Create A Raid Copy From A Raid-1 Or Raid-10 Array - IBM Advanced SerialRAID Adapters SA33-3285-02 User Manual

Using the ssa_make_copy Command to Create a RAID Copy from a RAID-1 or
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RAID-10 Array
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Figure 22 shows a volume group that contains one physical volume: hdisk1. This hdisk
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is a RAID-1 array.
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| Figure 22. A Volume Group the Contains One Physical Volume
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| The ssa_make_copy command checks whether the hdisk is either a RAID-1 or a
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RAID-10 array. If the array is neither of these types, the command displays a warning,
| then stops.
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If the hdisk is of the correct type, the ssa_make_copy command finds a suitable copy
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disk drive for RAID-1 or suitable copy disk drives for RAID-10. It then couples the copy
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disk drive, or drives, to the parent volume group, and runs the copy operation (see
| Figure 23).
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Figure 23. A Copy Disk Drive Coupled to the Parent hdisk
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When the copy operation has completed and the copy array has been uncoupled, the
| fast-write cache (if present) is temporarily disabled, and data is flushed to the physical
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disk drives. The ssa_make_copy command then forces the parent volume group to
| synchronize. The synchronize operation flushes all data from memory to disk, and stops
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all I/O operations.
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The command uncouples the copy disk drive from the parent hdisk, clears the PVID of
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the copy disk drive, restarts the I/O operations, and reenables the fast-write cache.
Chapter 7. Copying Data from Arrays and from Volume Groups
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