G A L A X Y N A S L X 5 C O N F I G U R A T I O N A N D S Y S T E M I N T E G R A T I O N G U I D E
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Section 3 Menu Functions
RO
Read Only, if it is turned on the LUN will be visible as a write protected disk. To switch the RO option
when it's disabled, you must first remove the volume from the group and then add it again setting the
flag as desired. FC logical volumes are not read only (RO -unchecked) by default.
WT
Write-through cache. Data is written to logical volume at the same time as it is cached. This type of
caching provides the advantage of internal consistency, because the cache is never out of sync with the
logical volume.
If RO and WT are disabled (RO and WT - unchecked) then Write-back cache is used by default. This
means that write is acknowledged as completed as soon as the data is stored in the disk cache. In later
time the disk cache commits the write to disk.
If RO and WT are disabled, (RO and WT are unchecked), Write-back cache is used by default. This
means that writing is considered completed as soon as the data is stored in the disk cache. The disk
cache commits the data to disk at a later time.
Blocksize
This field shows the current FC volume blocksize.
Function: WWN alias access fig 3.2.5c
Here you can add WWN aliases that are granted access to this group.
Figure 3.2.5b
