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Chapter 6 RAID Group Management
6.2 Functions in the Action Area for RAID Group
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
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When using the ETERNUS DX8700 S2, the following restrictions for each RAID type apply to the drive layout for
RAID group configuration. A RAID group that does not satisfy the required conditions cannot be created.
*1: The "SAS cascade" indicates the DEs that are connected to a single BRT port.
Same SAS cascade:
DE#x0, DE#x1, DE#x2, DE#x3 (x: 0 - F)
DE#x8, DE#x9, DE#xA, DE#xB (x: 0 - F)
[Example] SAS cascade for Port#0 of the BRT#0/#1: DE#00, DE#01, DE#02, DE#03
[Example] SAS cascade for Port#4 of the BRT#2/#3: DE#48, DE#49, DE#4A, DE#4B
Available Stripe Depth value
The following table shows the available Stripe Depth value for each RAID type.
*1: D: Data drives, M: Mirror drives, P: Parity drives
Restrictions for Stripe Depth modification
The following restrictions are applied for the RAID groups and volumes in the RAID group of which Stripe
Depth value is changed.
• Stripe depth for the existing RAID group cannot be changed.
• When selecting drives automatically to create a RAID group, the Stripe Depth cannot be changed.
• Capacity expansion (Logical Device Expansion) for the RAID group of which Stripe Depth was changed is
not available.
• Encryption of the RAID group of which Stripe Depth was changed is not available.
RAID Type Selection Conditions
High Performance
(RAID1+0)
Required Allocate mirroring pair drives to different SAS cascades (*1).
No restrictions are applied for BRT.
Recommended Distribute striping drives over as many DEs as possible.
High Capacity (RAID5)
Required Allocate member drives to different SAS cascades.
No restrictions are applied for BRT.
High Reliability (RAID6)
Required The maximum number of member drives that can be allocated in
the same SAS cascade is two.
No restrictions are applied for BRT.
Recommended Distribute member drives over as many DEs as possible.
Reliability (RAID5+0)
Required The maximum number of member drives that can be allocated in
the same SAS cascade is two.
No restrictions are applied for BRT.
Recommended Distribute member drives over as many DEs as possible.
Mirroring (RAID1)
Required Allocate mirroring pair drives to different SAS cascades (*1).
No restrictions are applied for BRT.
RAID type Drive configuration (*1) Available Stripe Depth value
Mirroring (RAID1) 1D+1M –
High Performance (RAID1+0) Any 64KB, 128KB, 256KB, 512KB, 1024KB
Striping (RAID0)
High Capacity (RAID5)
2D+1P – 4D+1P 64 KB, 128 KB, 256 KB, 512 KB
5D+1P – 8D+1P 64 KB, 128 KB, 256 KB
9D+1P – 15D+1P 64 KB, 128 KB
Reliability (RAID5+0) Any 64 KB
High Reliability (RAID6)