ZyXEL Communications NAS540, User Manual

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Chapter 8 Storage Manager
Cloud Storage User’s Guide
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The following table describes the labels in these screens.
8.4.2 iSCSI Targets Screens
The iSCSI target refers to the storage resource that is actually attached to the iSCSI storage
device. The initiator can manage the assigned disk volume on the iSCSI target over the Internet as
if it was the initiator’s internal storage volume.
iSCSI Targets allows you to create, edit, and delete an iSCSI target and map a target to an
existing LUN. Click Storage Manager > iSCSI > iSCSI Targets to show the following screen.
Table 23
Create a New LUN
LABEL DESCRIPTION
Step 1. Set Up LUN Properties
Name Type a LUN name in this field.
Note: Valid characters for the name are 0-9, a-z, and A-Z, and the maximum length is 30
characters. The “-” symbol is allowed as well, but cannot be the first character.
Location Select a volume to create the LUN on.
Capacity Type the size of the LUN in this field.
Allocation Mode Select the method the NAS uses to allocate storage space to the LUN.
Thin provisioning - Allocate space only when an initiator writes data to it.
Instant allocation - Allocate the specified disk space to the LUN when you create the
LUN.
Enable Write Back Select this option to increase the write performance. Write Back is a feature that collects
data in the hard disk’s cache memory first and permanently writes data into the hard
disk when the system is idle.
Note: It also creates a serious data integrity hazard. Data loss may occur if the NAS
experiences unexpected power loss before it has time to write the cached data to
the hard disk.
Next Click Next to go to the next step.
Cancel Click Cancel to close the screen without saving any settings.
Step 2. Summary
Use this screen to review the settings you configured in the last step.
Name Displays the name of the LUN.
Location Displays the name of the volume the LUN is located in.
Capacity Displays the size of the LUN.
Allocation Mode Displays the allocation method the LUN applies.
Write Back Displays whether the Write Back feature is enabled or disabled.
Back Click Back to go to the previous step.
Apply Click Apply to save the settings.
Cancel Click Cancel to close the screen without saving any settings.