Fujitsu ETERNUS DX S5 Series Design Manual page 81

2. Basic Functions
Optimization of Volume Configurations
WSVs are created by concatenating RAID groups that have the same state with regard to the following
conditions.
RAID level
•
• Number of member drives
Stripe depth
•
Type of drive to be configured and rotational speed (for disks)
•
WSVs cannot be created in the following RAID groups.
RAID groups that belong to TPPs or FTRPs
•
• RAID groups that are registered as REC Disk Buffers
• RAID groups that are registered as Extreme Cache Pools
RAID groups that are configured with RAID6-FR
•
• RAID groups without a continuous free area greater than the capacity of the volumes to be concatenated
Caution
• Capacity expansion cannot be performed (LDE is not possible) for RAID groups that are used to
configured with WSVs.
• If one or more RAID groups that are configured with Advanced Format drives are to be concatenated by
striping to create a WSV, the write performance may be reduced when accessing the created WSVs from
an OS or an application that does not support Advanced Format.
81 Design Guide