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QNAP

QTS 5.1.x

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Enabling async IO for an iSCSI LUN

Enabling async IO can improve the performance of a block-based LUN over an iSCSI connection, particularly for LUNs containing dual-actuator HDDs.

  1. Go to iSCSI & Fibre Channel > iSCSI Storage.
  2. Select a mapped iSCSI LUN.
    Tip:

    Double-click an iSCSI target to view all of its mapped LUNs.

  3. Click Action and select Modify.

    The Modify a LUN window opens.

  4. Under Advanced Settings, select Async IO (read only).
  5. Click Apply.

QTS enables async IO for the iSCSI LUN.

Note:

If you want to disable async IO later, you must restart iSCSI & Fibre Channel service or restart the NAS in order for the change to take effect.