Hitachi G1000 User Manual page 13

Number of parity
groups
From 1 to 4
*FMD capacity is assumed to be 1 TB.
When host I/Os are performed, the required shredding time is at least six
times that of when no host I/Os are performed. If a DKxxx-HxxxAT data
drive is used for creating a parity group on an encrypted data drive, the time
required for shredding that parity group is the maximum time listed.
If the volumes to be shredded belong to drives of mixed types or mixed
configurations, the longest required times associated with the drive type or
drive configuration apply to all volumes. Thus, mixed types and
configurations take more time for the volumes to become available for use
than when the drive type and drive configuration are the same. When you
add drives or change drive configurations, you should arrange the drives
into those with the same standard required times, and then add drives
starting with those volume types requiring the least shredding time.
Fibre-channel connectivity is required for both mainframe and open-
systems volumes.
Overview of Hitachi Volume Shredder
Hitachi Virtual Storage Platform G1000 Hitachi Volume Shredder User Guide
RAID level
RAID 1 2D+2D
RAID 5 3D+1P
7D+1P
RAID 6 6D+2P
14D+2P
Standard required time*
20 minutes
10 minutes
10 minutes
10 minutes
5 minutes
1–5