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VIO - Storage Configuration

Setting MPIO parameters at various levels:


1.  At the physical adapter (FC) level on VIOS:
For all fscsi devices on VIOS, set dyntrk=yes and fc_err_recvo=fast_fail
fc_err_recov will fila any I/Os immediately if the adapter detects a link event, such as a lost link between a storage device and a switch.  The 'fast_fail' setting is recommended only for a dual VIOS configuraiton.  

dyntrk attribute allows the VIOS to tolerate cabling changes in the SAN.  

*Both VIOS need to be restarted for these changes to take effect. 


2.  To all the disks on VIOS:

alogrithm=load_balance (round robin - per best practices guide)
reserve_policy=no_reserve
hcheck_mode=nonactive
hcheck_interval=60

3.  At the VIO Client level:
vscsi devices in the client (virtual adapter) : 
vscsi_path_to=30

All the devices in the client: 
algorithm=failover
reserve_policy=no_reserve
hcheck_mode=nonactive - Specifying 'nonactive means that healthcheck commands are sent down paths that have no active I/O, including paths with state of failed. 
hcheck_interval=60


  


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