Fujitsu ETERNUS DX60 S3 User Manual page 913

Appendix A Parameter List
A.5 RAID Group Management
●
Advanced Setting
Stripe Depth should be set only when advanced tuning needs to be performed for each RAID group. It is not
necessary to change the default value for normal use.
Specifying a larger value for the Stripe Depth can reduce the number of drives to access. For "High
Performance (RAID1+0)", reducing the number of commands issued to drives improves the performance of
access to the specified RAID group. For "High Capacity (RAID5)", however, specifying a larger value for the
Stripe Depth might decrease the sequential write performance. In addition, several restrictions apply to a
RAID group whose Stripe Depth has been changed and volumes created for such RAID group. Refer to
"Restrictions for Stripe Depth modification (for RAID group)" (page 913)
• Stripe Depth
Description
Input condition/
Display contents
Available Stripe Depth value (for RAID group)
The following table shows the available Stripe Depth value for each RAID level.
Mirroring (RAID1)
High Performance (RAID1+0)
Striping (RAID0)
High Capacity (RAID5)
Reliability (RAID5+0)
High Reliability (RAID6)
High Reliability (RAID6-FR)
*1: D: Data drives, M: Mirror drives, P: Parity drives
Restrictions for Stripe Depth modification (for RAID group)
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.
Select the Stripe Depth of the RAID group that is to be created.
The setting is not available when the RAID level is "Mirroring (RAID1)". The value is fixed
to "64 KB" for the RAID levels "Reliability (RAID5+0)", "High Reliability (RAID6)", or "High
Reliability (RAID6-FR)". Available Stripe Depth value varies depending on the RAID level.
Refer to "Available Stripe Depth value (for RAID group)" (page 913)
•
64 KB
•
128 KB
•
256 KB
•
512 KB
•
1024 KB
RAID level Drive configuration (*1)
1D+1M
Any
2D+1P – 4D+1P
5D+1P – 8D+1P
9D+1P – 15D+1P
Any
ETERNUS Web GUI User's Guide (Settings)
Copyright 2015 FUJITSU LIMITED
–
64KB, 128KB, 256KB, 512KB, 1024KB
64 KB, 128 KB, 256 KB, 512 KB
64 KB, 128 KB, 256 KB
64 KB, 128 KB
64 KB
913
for details.
for details.
Available Stripe Depth value
P2X0-1270-13ENZ0