SAN Boot Implementation and Best Practices Guide ... - IBM Redbooks

The output of this comman, as shown in Example 2-15, clearly details the hdisk -
logical drive relationship.
Example 2-15 mpio_get_config -Av output
Frame id 0:
Storage Subsystem worldwide name: 608e50017b5bc00004a955e3b
Controller count: 2
Partition count: 1
Partition 0:
Storage Subsystem Name = 'ITSO_5020'
hdisk LUN # Ownership User Label
hdisk2 2 A (preferred) Secured1
hdisk3 3 A (preferred) AIX_Boot
hdisk4 4 A (preferred) test3
hdisk5 40 B (preferred) p630_Test_40_64KB
hdisk6 41 A (preferred) p630_Test_41_8KB
hdisk7 42 B (preferred) p630_Test_42_512KB
hdisk8 43 A (preferred) p630_Test_43_128KB
– For AIX systems using SDDPCM with AIX MPIO, then issuing the equivalent command
to the mpio_get_config will give the output in the same format as before:
sddpcm_get_config -Av
2.13.6 AIX post installation tasks with DS5000 best practices
After installing AIX, some tasks must be done to preserve the environment, especially when
using SAN Boot.
HBA additional configuration
List the Fibre Channel devices and its attributes as shown in Figure 2-136.
# lsdev -Cc adapter|grep fcs
fcs0 Available 03-00 4Gb FC PCI Express Adapter (df1000fe)
# lsattr -El fscsi0
attach switch How this adapter is CONNECTED False
dyntrk no Dynamic Tracking of FC Devices True
fc_err_recov delayed_fail FC Fabric Event Error RECOVERY Policy True
scsi_id 0xc0700 Adapter SCSI ID False
sw_fc_class 3 FC Class for Fabric True
#
Figure 2-136 List of devices and default attributes for HBA0/FCS0
As a best practice, the recommendation for HBA is to use the following settings:
► DYNTRK=YES (AIX supports dynamic tracking of Fibre Channel (FC) devices.)
Previous releases of AIX required for the user to unconfigure FC storage device and
adapter device instances before making changes on the system area network (SAN) that
might result in an N_Port ID (SCSI ID) change of any remote storage ports.
If dynamic tracking of FC devices is enabled, the FC adapter driver detects when the Fibre
Channel N_Port ID of a device changes. The FC adapter driver then reroutes traffic
destined for that device to the new address while the devices are still online.
116 SAN Boot Implementation and Best Practices Guide for IBM System Storage