Troubleshooting a host running AIX

This section provides a troubleshooting configuration aid for a DS6000™ that is connected to a host system that is running AIX.

On a heavily loaded system, you might see lower than expected performance and errors that indicate that the host adapter was unable to activate an I/O request on the first attempt. The most likely cause of these errors is that the host is low on resources.

To reduce the incidence of these errors, perform the following steps to increase the resources by modifying the maximum transfer size attribute for the adapter:
  1. Type the following command to view the current setting:

    lsattr -El <hba> -a max_xfer_size,

    where <hba> is the name of the adapter that logs the error.
  2. Type the following command to increase the size of the setting:

    chdev -l <hba> -P -a max_xfer_size=0x1000000

    Note: To view the range of allowable values for the attribute, type lsattr -Rl <hba> -a max_xfer_size.
  3. Restart the host to put these changes into effect.
Parent topic: Verifying the AIX host system configuration on a pSeries
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