asr.tech.notes

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 leve l: 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 se...