Setting Description
LUN capacity Specify the maximum capacity of the LUN. The maximum capacity
depends on the LUN allocation method:
• Thick provisioning: Equal to the amount of free space in the
parent storage pool.
• Thin provisioning: 250 TB
7. Optional: Configure any of the following advanced settings.
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.
QTS 4.5.x User Guide
iSCSI & Fibre Channel 306
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