000-221 · Question #56
Why would an administrator need to change the type of a volume group (VG) to Scalable?
The correct answer is B. More than 128 physical volumes need to be added to the volume group. The Scalable volume group type must be used when more than 128 physical volumes need to participate in a single volume group, as standard and Big VGs cannot exceed that limit.
Question
Why would an administrator need to change the type of a volume group (VG) to Scalable?
Options
- AAn application requires physical partition sizes larger than 512MB.
- BMore than 128 physical volumes need to be added to the volume group.
- CPerformance requirements dictate using per VG pbuf pools.
- DMore than one log logical volume is needed in the VG.
How the community answered
(38 responses)- A13% (5)
- B76% (29)
- C3% (1)
- D8% (3)
Why each option
The Scalable volume group type must be used when more than 128 physical volumes need to participate in a single volume group, as standard and Big VGs cannot exceed that limit.
Physical partition size limits are controlled by the PP size setting during VG creation and are not a distinguishing characteristic that requires the Scalable type specifically.
AIX supports three volume group types: standard (up to 32 PVs), Big (up to 128 PVs), and Scalable (up to 1024 PVs). When an environment requires more than 128 physical volumes in a single VG - for example, in large storage pools - the VG type must be changed to Scalable because no other type supports that scale. The Scalable type also increases the maximum number of logical volumes and physical partitions supported.
Per-VG pbuf pool configuration is a performance tuning option available across VG types and does not require the Scalable type.
The number of log logical volumes within a VG is not a factor that determines the need for the Scalable VG type; log LV limits are governed by other constraints.
Concept tested: AIX Scalable volume group type and PV limits
Source: https://www.ibm.com/docs/en/aix/7.2?topic=concepts-volume-group-types
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