how many channels available on my server to SAN

[Vipin Singhal]

Hi,
How i will find that how many hba (storage) channels (paths) available on my server.
Server is connected to SAN,
Should I need to run-
#ioscan

which synopis I have to use to know- how many channels available on my server to SAN.

Thanks
Vipin

[Edgar_8]

Hi Vipin,

If you running HPUX, the following command will tell you the number of fc HBAs:

# ioscan -fnC fc

HTH

[Vipin Singhal]

How i will come to know about the port (HBA)details?

#ioscan -fnC fc
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
fc 0 0/0/10/1/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channel Mass Storage Adapter
/dev/td0
fc 1 1/0/2/1/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channel Mass Storage Adapter
/dev/td1

But there should be four channels(paths) to SAN.
Please suggest

[Edgar_8]

Hi Vipin,

Using the output of the ioscan info, run the following commande to determine the fc HBA Node or PORT WWN:

# fcmsutil /dev/td0
# fcmsutil /dev/td1

HTH

[Patrick Wallek]

You can find out more information about each FC card by doing:

# fcmsutil /dev/td0
# fcmsutil /dev/td1

At this point, you only have 2 paths to the SAN since you only have 2 FC cards. If you are supposed to have 4, check the server itself and see if you have other cards installed that may not be active for some reason.

[Edgar_8]

Hi Vipin,

As Patrick rightly stated, if you supposed to have 4 fc HBAs, to confirm look at the rear end of the server to verify the number of fc HBAs connected. Also check if there is any LED lights on.

HTH

[Vipin Singhal]

It was not seeing all four paths to the SAN. so we reconfigured PowerPath and did an I/O Scan and the server now sees all 4 paths to the SAN.

But it is again now showing two paths.

is there any other command to find the deatils ?

[Vipin Singhal]

Please update

[Vipin Singhal]

These ate the outputs:
# ioscan -fnC fc
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
fc 0 0/0/10/1/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channel Mass Storage Adapter
/dev/td0
fc 1 1/0/2/1/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channel Mass Storage Adapter
/dev/td1
root@warbler:[/root]
# powermt display
Symmetrix logical device count=0
CLARiiON logical device count=104
==============================================================================
----- Host Bus Adapters --------- ------ I/O Paths ----- ------ Stats ------
### HW Path Summary Total Dead IO/Sec Q-IOs Errors
==============================================================================
18 1/0/2/1/0.21.47.0.0 optimal 104 0 - 0 90
19 0/0/10/1/0.11.15.0.0 optimal 104 0 - 0 90
20 0/0/10/1/0.11.47.0.0 optimal 104 0 - 0 0
21 1/0/2/1/0.21.15.0.0 optimal 104 0 - 0 0



ioscan is showing 2 paths, while powermt is showing 4 paths, whatz the difference in it?

Do these need to be defined to the OS?
Please suggest
vipin

[Deoncia Grayson_1 · Accepted solution]

Actually its showing 4 paths to two fiber cards, Pay close attention to the hardware paths, you have 2 paths to the same fc cards...

# ioscan -fnC fc
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
fc 0 0/0/10/1/0 /dev/td0
powermt display:
19 0/0/10/1/0.11.15.0.0
20 0/0/10/1/0.11.47.0.0

fc 1 1/0/2/1/0 /dev/td1
powermt display:
1/0/2/1/0.21.47.0.0
1/0/2/1/0.21.15.0.0

# powermt display
Symmetrix logical device count=0
CLARiiON logical device count=104
----- Host Bus Adapters --------- ------ I/O Paths ----- ------ Stats ------
HW Path
18 1/0/2/1/0.21.47.0.0
19 0/0/10/1/0.11.15.0.0
20 0/0/10/1/0.11.47.0.0
21