Fujitsu ETERNUS DX80 S2 User Manual page 43

Chapter 3 Setup
3.1 Thin Provisioning Setup
- Caution should be taken when re-recognizing volume capacity dynamically from a server system after
performing TPV capacity expansion with the Thin Provisioning Volume capacity expansion function.
Some platform types (server OS) and versions cannot recognize the expanded volume capacity. To
expand capacity dynamically, refer to the relevant manuals of each OS and file system.
This caution does not apply when creating a new system after TPV capacity expansion.
• Balancing TPV allocation
- Balancing TPV allocation can be performed for TPVs in the same TPP.
- The total number of TPV balancing, FTRP balancing, RAID Migration, and Flexible Tier Migration pro-
cesses that can be performed at the same time is 32.
- TPV balancing cannot be performed at the same time as RAID Migration to a different TPP for which the
target TPV does not belong.
- If RAID groups that cannot perform balancing (such as RAID groups without free capacity) exist in a TPP,
balancing of physical allocation capacity is performed among the other RAID groups in the TPP. If this
occurs, the balancing level after the balancing process is complete may not be "High".
- When TPV balancing is performed, an area for the work volume (the destination TPV which has the
same capacity as the source TPV) is secured in the TPP to which the TPV belongs. As a result, the status
of the TPP may temporarily become alarm status (the TPP usage exceeds the "Caution" or "Warning"
threshold). The alarm status is released when balancing is completed successfully.
- If the capacity of the TPP to which the target TPV belongs is expanded during a TPV balancing process,
the balancing level might be less than before.
- TPV balancing cannot be performed for volumes that are undergoing Zero Reclamation.
• Zero Reclamation
- Zero Reclamation cannot be performed for volumes that are undergoing RAID Migration.
- Zero Reclamation cannot be performed for volumes that are undergoing TPV balancing.
ETERNUS DX80 S2/DX90 S2 Disk storage system User's Guide -Operation-
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