This release provides a new attribute, erp_ller, to the EMX subsystem that allows you to turn on Link Level Error Recovery (LLER) for tape I/O. When enabled, the Emulex adapter attempts to successfully complete I/O that would have otherwise failed to a link error. If the adapter is unable to successfully complete the I/O, the I/O will be returned with an appropriate error.
Setting erp_ller to a value of 1 enables this feature. It is turned off by default due to issues seen with network storage routers and its handling of device resets. Command timeout errors may be returned if a device reset is issued when Link Level Error Recovery is enabled.
If you are experiencing failed tape I/O due to link issues, you can enable this feature and see if it helps.
To view the current setting of the attribute use the following command:
# sysconfig -q emx erp_ller |
For more information, see the revised emx(7) reference page delivered in this kit.
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