Setting parameters for Emulex adapters

This section provides instructions for setting parameters for Emulex adapters for your PRIMEPOWER host system.

1. Type cd /etc to change to the /etc subdirectory.
2. Backup the system file in the subdirectory.
3. Edit the system file and set the following parameters for servers with configurations that only use Emulex or QLogic adapters.

   sd_io_time

   This parameter specifies the timeout value for disk operations. Add the following line to the /etc/system file to set the sd_io_time parameter for the storage unit LUNs: set sd:sd_io_time=0x78

   sd_retry_count

   This parameter specifies the retry count for disk operations. Add the following line to the /etc/system file to set the sd_retry_count parameter for the storage unit LUNs: set sd:sd_retry_count=5

   maxphys

   This parameter specifies the maximum number of bytes you can transfer for each transaction. The default value is 12 6976 (124 KB). If the I/O block size that you requested exceeds the default value, the request is broken into more than one request. You should tune the value to the application requirements. For maximum bandwidth, set the maxphys parameter by adding the following line to the /etc/system file: set maxphys=1048576 (1 MB)

   Note: Do not set the value for maxphys greater than 1048576 (1 MB). Doing so can cause the system to hang.