QNAP TVS-472XT 4-Bay NAS Enclosure - Manual (Page 375)

Setting Description
Sector size Changing the sector size to 4 KB increases LUN performance for
specific applications and disk types.
Important
VMware does not currently support a 4 KB sector
size.
Alert threshold QTS issues a warning notification when the percentage of used
LUN space is equal to or above the specified threshold.
Report volatile write cache for data
safety
When enabled, QTS informs iSCSI initiators connected to this LUN
that volatile write-cache is being used on the NAS. As a result,
initiators might frequently tell QTS to flush cached LUN data to
disk, which increases data safety but decreases LUN performance.
FUA bit support When enabled, iSCSI initiators are able to tell QTS to flush
important cached data to disk, instead of the whole read-write
cache.
Important
Both the iSCSI initiator and the application using
the LUN must support this feature.
8. Click Next.
9. Optional: Deselect Do not map it to a target for now.
If deselected, the Edit LUN Mapping wizard appears after QTS has finished creating the LUN.
10. Click Finish.
11. Optional: Map the LUN to an iSCSI target or Fibre Channel port group.
For details, see the following topics:
• Mapping a LUN to an iSCSI Target
• Mapping a LUN to a Fibre Channel Port Group
iSCSI
iSCSI enables computers, servers, other NAS devices, and virtual machines to access NAS storage in the form
of LUNs over a TCP/IP network. Hosts can partition, format, and use the LUNs as if they were local disks.
Getting Started with iSCSI
1. Create an iSCSI target on the NAS.
For details, see Creating an iSCSI Target .
2. Create a LUN on the NAS.
A LUN is a portion of storage space, similar to a volume. LUNs are created from storage pool space
(block-based) or from space in a thick volume (file-based).
For more information, see:
• QTS LUN Types
• Creating a Block-Based LUN
• Creating a File-Based LUN
QTS 4.4.x User Guide
iSCSI & Fibre Channel 374