HP XP P9500 Storage - Manual (Page 37)

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Inflow Control. When the write operation to the external volume cannot be completed, Inflow
Control specifies whether the write operation to cache memory is limited (Enable) or continued
(Disable).
◦ If Enable is specified, the write operation to cache is limited and I/O from the host is not
accepted. Limiting the write operation prevents the accumulation of data that cannot
destage to cache memory.
◦ When Disable (the default) is specified, I/O from the host during the retry operation is
written to cache memory. When write operations to the external volume are again possible,
data in cache memory is written to the external volume (all data is destaged).
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Load Balance Mode. When the Path mode is Multi or APLB, select Normal Round-robin,
Extended Round-robin, or Disable as a Load Balance Mode for the external storage system.
By default, Normal Round-robin is used. However, when the product name of the storage
system is displayed as “generic”, Disable is used by default.
◦ Normal Round-robin: I/O is distributed to several paths on which I/O operation is enabled
for the external storage system.
◦ Extended Round-robin: I/O is distributed to several paths on which I/O operation is
enabled for the external storage system. For sequential I/O, the external volume is divided
into sections at regular intervals. In this case, the same path is used for I/O within the
same section which reduces the frequency of I/O distribution.
◦ Disable: As in Single mode, I/O operation is performed using the path that has the highest
priority of all paths on which I/O operation is enabled for the external storage system.
Editing mapping policies
1. In Remote Web Console, click External Storages in the Storage Systems tree.
2. In the External Storages window, select the row for an external storage system.
3. At the bottom of the window, click More Actions > Edit Policies.
4. In the Edit Policies window, use the information in the previous sections to enter new settings.
NOTE: You can also edit Cache Mode and Inflow Control for individual external volumes.
In Remote Web Console, select an external volume in the Mapped Volumes tab. Then click
Edit External Volumes.
Editing external volume policies (settings) 37