how to get the workload distributed over both fcs0+1?

[Michael]

If the adapters had rootvg connected - yes a reboot is needed. Otherwise you just need to do what is needed to bring the volume group offline and then try rmdev -l fcsX -R (and/or fscsiX) before using the command chdev. After the chdev commands have completed, cfgmgr brings the adapters and disks to "Available" status - and volume groups can be onlined, etc..

[Joerg]

  Some investigations of time and the reason could be found and corrected: at the storage system. But to get the changed settings from the SAN visible and usable at AIX those partitions had to be shutdown and started again.   
Best regards!   

[Joerg]

Hello,
on two p6-partitions we running AIX 6100-01-03-0846. Each partition is connected to SAN storage over 2 FC adapters. On each partition a database DB2 udb is running. Each db will be backup to a TSM server.

On one of the partitions both fcs0 and fcs1 will be used. But onn the other partition only fcs0 will be used.

We have checked some settings, but we did not found the reason. Who can help us to solve this issue?
Could it be that we did not see the actual ACTIVE settings?
Is the reason not at the AIX level? Where else?

Thank you and kind regards!
Joerg

Here are some settings:
lsdev | grep fcs
fcs0           Available 01-00    4Gb FC PCI Express Adapter (df1000fe)
fcs1           Available 05-00    4Gb FC PCI Express Adapter (df1000fe)

lsdev | grep fscs
fscsi0         Available 01-00-02 FC SCSI I/O Controller Protocol Device
fscsi1         Available 05-00-02 FC SCSI I/O Controller Protocol Device

fcstat fcs0 | grep -i -p active
FC-4 TYPES:
  Supported: 0x0000012000000000000000000000000000000 000000000000000000000000000
  Active:    0x0000010000000000000000000000000000000 000000000000000000000000000
Class of Service: 3
Port Speed (supported): 4 GBIT
Port Speed (running):   4 GBIT
Port FC ID: 0x0b0600
Port Type: Fabric

fcstat fcs1 | grep -i -p active
FC-4 TYPES:
  Supported: 0x0000012000000000000000000000000000000 000000000000000000000000000
  Active:    0x0000010000000000000000000000000000000 000000000000000000000000000
Class of Service: 3
Port Speed (supported): 4 GBIT
Port Speed (running):   4 GBIT
Port FC ID: 0x150600
Port Type: Fabric

lsattr -El fcs0
bus_intr_lvl             Bus interrupt level                                False
bus_io_addr   0xffc00    Bus I/O address                                    False
bus_mem_addr  0xffebf000 Bus memory address                                 False
init_link     pt2pt      INIT Link flags                                    True
intr_msi_1    581        Bus interrupt level                                False
intr_priority 3          Interrupt priority                                 False
lg_term_dma   0x800000   Long term DMA                                      True
max_xfer_size 0x100000   Maximum Transfer Size                              True
num_cmd_elems 200        Maximum number of COMMANDS to queue to the adapter True
pref_alpa     0x1        Preferred AL_PA                                    True
sw_fc_class   2          FC Class for Fabric                                True

lsattr -El fcs1
bus_intr_lvl             Bus interrupt level                                False
bus_io_addr   0xffc00    Bus I/O address                                    False
bus_mem_addr  0xffebf000 Bus memory address                                 False
init_link     pt2pt      INIT Link flags                                    True
intr_msi_1    33349      Bus interrupt level                                False
intr_priority 3          Interrupt priority                                 False
lg_term_dma   0x800000   Long term DMA                                      True
max_xfer_size 0x100000   Maximum Transfer Size                              True
num_cmd_elems 200        Maximum number of COMMANDS to queue to the adapter True
pref_alpa     0x1        Preferred AL_PA                                    True
sw_fc_class   2          FC Class for Fabric                                True

lsattr -El fscsi0
attach       switch    How this adapter is CONNECTED         False
dyntrk       no        Dynamic Tracking of FC Devices        True
fc_err_recov fast_fail FC Fabric Event Error RECOVERY Policy True
scsi_id      0xb0600   Adapter SCSI ID                       False
sw_fc_class  3         FC Class for Fabric                   True

lsattr -El fscsi1
attach       switch    How this adapter is CONNECTED         False
dyntrk       no        Dynamic Tracking of FC Devices        True
fc_err_recov fast_fail FC Fabric Event Error RECOVERY Policy True
scsi_id      0x150600  Adapter SCSI ID                       False
sw_fc_class  3         FC Class for Fabric                   True