Start Balancing Flexible Tier Pool - Fujitsu ETERNUS DX60 S3 User Manual

Chapter 6 Thin Provisioning Pool Management

6.11 Start Balancing Flexible Tier Pool

6.11 Start Balancing Flexible Tier Pool
This function starts Flexible Tier Pool (FTRP) balancing sessions.
The FTRP balancing function equalizes unevenly allocated physical area in the FTSPs that configure an FTRP.
By using this function, the physical allocated areas are reallocated equally among the RAID groups in the
FTSPs. The I/O access to the FTV is distributed almost equally to the RAID groups in the FTSP.
Requirements for an FTRP to be balanced
• The status of the FTRP is "
• Balancing of the selected FTRP is not being performed
• Free space, which can be used for balancing, exists in the FTSPs in the target FTRP
• The ETERNUS DX60 S3 does not support this function.
• Before balancing the FTRP, make sure that "Used Capacity" for all the FTSPs in the target FTRP is less than
50% of "Total Capacity". If this requirement is not satisfied and the capacity runs out, the FTRP balancing
may not be complete. "Used Capacity" and "Total Capacity" for FTSP can be checked from the [Flexible Tier
Pool Detail] screen ([Flexible Tier Sub Pool] tab).
Refer to "Flexible Tier Sub Pool Detail (Basic)" in "ETERNUS Web GUI User's Guide (Operation)" for details.
• Even after the FTRP balancing session is performed, the physical allocation between the FTVs and the
FTSPs does not change.
• The FTRP balancing function extracts up to 32 balanceable FTVs (*1) that have a low balancing level from
the selected FTRP and performs balancing sessions in the FTSPs. Note that FTVs are not extracted as
balancing targets in certain conditions. For example, FTVs with a high balancing level, FTVs that are
undergoing RAID migration, or FTVs that are undergoing capacity optimization.
*1: Up to 32 sessions, which include FTV balancing sessions, TPV balancing sessions, and RAID migration sessions,
can be performed at the same time. An FTRP balancing session is performed in each FTRP. Note that the number
of FTV balancing sessions that are performed at the same time cannot be specified.
• Balancing of FTVs in the following conditions is not available:
- FTVs which capacity is less than 20GB
- FTVs which used capacity is less than 10GB
The FTV capacity can be checked in the [Flexible Tier Pool Detail (Volume)] screen. Refer to "Flexible Tier
Pool Detail (Volume)" in "ETERNUS Web GUI User's Guide (Operation)" for details.
• FTRP balancing cannot be started in the following conditions:
- The Thin Provisioning function is disabled
- The Automated Storage Tiering feature is disabled
- The maximum number of volumes is already registered in the ETERNUS DX
- The total number of TPV balancing sessions and RAID migration sessions that are running in the
ETERNUS DX is 32
- The total capacity for the TPV balancing sessions and the RAID migration sessions that are running in
the ETERNUS DX is 128TB
- The RAID group diagnosis is being performed in the ETERNUS DX
- The disk diagnosis is being performed in the ETERNUS DX
- Capacity optimization is being performed for all of the balancing target FTVs in the FTRP
- ODX is being performed for all of the balancing target FTVs in the FTRP
Available", " Partially Readying", or "
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ETERNUS Web GUI User's Guide (Settings)
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