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ds800 only one path is used

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Operating Systems AIX ds800 only one path is used
# 1  
Old 07-21-2010
ds800 only one path is used
Hello everybody, one of my Lpar is directly attached to DS8000 storadge..
when I run nmon I see that only fc0 adapter is used and not fc1..
the output of iostat -m is:
Code:
iostat -m

System configuration: lcpu=16 drives=5 ent=4.00 paths=8 vdisks=2

tty:      tin         tout    avg-cpu: % user % sys % idle % iowait physc % entc
          0.0          1.0                0.4   0.4   95.0      4.3   0.0    0.9

Disks:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
hdisk3          70.0     15660.2     643.8   11123588562  8174747596

Paths:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
Path1            0.0       0.0       0.0          0         0
Path0           69.9     15660.2     643.8   11123588647  8174747596

Disks:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
hdisk4          13.2     1756.7     122.3   831446397  1333399852

Paths:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
Path1            0.0       0.0       0.0          0         0
Path0           13.1     1756.7     122.3   831446398  1333399860

Disks:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
hdisk2          71.8     16695.1     672.6   11816345701  8757376948

Paths:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
Path1            0.0       0.0       0.0          0         0
Path0           71.8     16695.1     672.6   11816345718  8757376948

Disks:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
hdisk0           1.9      43.0       4.2    3310900  49635756

Paths:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
Path0            1.9      43.0       4.2    3310900  49635756

Disks:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
hdisk1           1.9      41.4       4.0    1377859  49645740

Paths:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
Path0            1.9      41.4       4.0    1377859  49645740


I wonder how can I change FC adapter to Active/Active -because as I know the default method is Active/Passive.. and if I change it to active/active will it give me some write perfomance? PLS I need your help :-) Thanks in advance
# 2  
Old 07-21-2010
What driver are you using? mpio? Powerpath? ... ?
# 3  
Old 07-21-2010
well how can I check what driver am I using? thanks in advance
# 4  
Old 07-21-2010
You could issue the following
Code:
powermt display
# and
lspath

and post their output.

If you use another driver like for example Datacore SanSymphony Cambex drivers, you have to check your documentation since I forgot the path where their tools are installed to. There could be other drivers active - maybe you have a co-worker you could ask?
# 5  
Old 07-21-2010
well, lspath shows this:
Code:
lspath
Enabled hdisk0 vscsi0
Enabled hdisk1 vscsi1
Enabled hdisk2 fscsi0
Enabled hdisk3 fscsi0
Enabled hdisk2 fscsi1
Enabled hdisk3 fscsi1
Enabled hdisk4 fscsi0
Enabled hdisk4 fscsi1


well I think we use the following driver
Code:
lslpp -l | grep sdd
  devices.sdd.61.rte         1.7.2.5  COMMITTED  IBM Subsystem Device Driver
  devices.sdd.61.rte         1.7.2.5  COMMITTED  IBM Subsystem Device Driver

# 6  
Old 07-22-2010
I guess you are using MPIO. You can try
Code:
smitty mpio

to check if the "algorithm" is set to fail_over or round_robin. When set to fail_over, it should just use one path and failover only if that path fails. When set to round_robin, it uses both paths.
There is also the priority of the paths you can set. The lower the number, the higher the priority.
I guess you want round_robin with the same priority for both paths.

Here is also some documentation about it:
pSeries and AIX Information Center
# 7  
Old 07-22-2010
zaxxon you know that people like you make this forum so cool!!! thanks a lot dear friend!
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