| 摘要 |
PROBLEM TO BE SOLVED: To provide a system and method for managing a free segment pool, when the pool is near out-of-space, that allows an administrator to mitigate this risk by obtaining added storage spaces. SOLUTION: If a number of free segments in a free segment pool at a storage subsystem is detected as below a desired minimum, one or more of the following is performed: selecting and adding LDEVs (logical devices) from an internal storage to the free segment pool; transitioning the LDEVs to a VDEV (virtual device); selecting and adding LDEVs from an external storage to the free segment pool. Data migration may also occur by: selecting a source segment at a VDEV for migration; reading data from the source segment; writing the data to a target segment, the target segment being a free segment from the free segment pool and assigning the target segment to the VDEV. COPYRIGHT: (C)2007,JPO&INPIT
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