Fujitsu Eternus DX600 S3 - Page 928

Appendix A Parameter List
A.6 Thin Provisioning Management
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED P2X0-1270-13ENZ0
928
● Advanced Setting
Stripe Depth should be set only when advanced tuning needs to be performed for each RAID group
configuring the TPP. 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. Refer to "Restrictions for Stripe Depth modification (for
TPP)" (page 929) for details.
• Stripe Depth
Available Stripe Depth value (for TPP)
The following table shows the available Stripe Depth value for each RAID level.
Description 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)". When the RAID
level is "High Reliability (RAID6)", the value is fixed to "64KB". Available Stripe Depth
value vary depending on the RAID level. Refer to "Available Stripe Depth value (for TPP)"
(page 928) for details.
Input condition/
Display contents
• 64 KB
• 128 KB
• 256 KB
• 512 KB
• 1024 KB
RAID level 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)
3D+1P 64 KB, 128 KB, 256 KB, 512 KB
4D+1P, 7D+1P 64 KB, 128 KB, 256 KB
8D+1P, 12D+1P 64 KB, 128 KB
High Reliability (RAID6) Any 64 KB
High Reliability (RAID6-FR) Any 64 KB