D-Link DSN-2100 xStack Storage, User Manual

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58 Chapter 5 Configuring the xStack Storage Array
Table 5-4 Create Volume Wizard - Access and Efficiency Settings Screen Settings
Setting Description
Access Bandwidth Weight Specifies how much bandwidth the volume will use (i.e., how much initiator I/O activity can be
expected for the volume). The larger the number, the greater the I/O. Select a large volume to
have the initiators achieve fast access to the volume compared to the other volumes on xStack
Storage Array. A large value selects a larger number of stripe members. The method the xStack
Storage Array uses to select the organization and number of members is described in Table 5-5.
Storage Efficiency Hint Specifies the xStack Storage Array’s member count selection. A large value increases disk space
more efficiently (i.e., uses less space for redundancy data) and requests a larger number of
members (which costs less space for parity overhead).
Table 5-5 Volume Organization and Members Based on Redundancy and Access Bandwidth Weight
Redundancy Access Bandwidth Weight Value
0 1 Large Values
None JBOD organization (1 member) Stripe organization with 2
members Stripe organization with more
members
Mirror Mirror organization (2 members) Mirrored stripe organization with 2
stripe members Mirrored stripe organization with
more stripe members
Parity Parity organization with 3
members In combination with the Storage Efficiency Hint, this selects Parity
organization with more members
In a mirrored stripe organization, there are always two members for each
stripe member to allow for the duplicate copy of the data.
After a volume is created, you can use the Advanced tab to write-protect
the volume and suppress Synch Cache commands from the host (see
5.4.1.4).
5.4.1.1.2 Creating Volumes Manually
The following procedure describes how to create volumes manually. With this method, you select
the organization and other parameters, and specify drives that can be used for the volume. The
xStack Storage Array then finds the storage space on the given drives to allocate and create the
Volume. As you create volumes, record the information in Appendix B.
1. In the Logical Resources tab, click the plus sign next to Blade A Base Pool . All drives
available for volume creation appear under Blade A Base Pool .
2. In the Logical Resources tab, click the plus sign next to Available Pool .
3. If drives to be used for this volume are not already in the Blade A Base Pool, those drives
need to be moved to that Pool. To do this, drag one of the desired drives from
Available Pool
to Blade A Base Pool . Repeat this step for each additional drive that you want included in
the volume.
4. In the Logical Resources tab, click Blade A Base Pool .