Create the guid.txt File for Installation

If your InfiniBand fabric uses the Fat-Tree routing algorithm, you must provide a modified listing of fabric card GUIDs, called the root node GUID file, for the Subnet Manager. The /etc/opensm/guid.txt file is such a file. This procedure describes how to create the guid.txt file.

1. Identify the prerequisite and subsequent tasks you must perform in conjunction with this procedure, to install the switch.

   See the table in Installation Sequence.

2. Type the following command on the CMC to retrieve the fabric card base GUID:

   # getbaseguid fc slot

   where slot is the number of the fabric card (0–8). For example:

   # getbaseguid fc 0
   Base GUID = 0x00bad0fc0009f000
   #

3. Record the GUID to a text editor on your Linux InfiniBand host.

4. Repeat Step 2 and Step 3 for each fabric card.

   Once you have recorded each fabric card’s GUID, you will have a list similar to the following on your Linux InfiniBand host:

   0x00bad0fc0009f000
   0x00bad0fc0033f100
   0x00bad00017fcf200
   0x00bad00005fcf300
   0x00bad00003fcf400
   0x00bad00007fcf500
   0x00bad0fc0011f600
   0x00bad0b00002f700
   0x00bad0b00001f800

   ---

   Note - If you have fewer than 9 fabric cards, your list will be smaller.

   ---

5. For each GUID, add the following values to make two new sums:

   • 0xa2

   • 0xb2

   ---

   Note - For GUIDs that end with two zeros (00), you are effectively replacing the zeros with a2 and b2.

   ---

   For example, 0x00bad0fc0009f000 becomes:

   • 0x00bad0fc0009f0a2

   • 0x00bad0fc0009f0b2

6. Repopulate your list with the modified GUIDs.

   For example:

   0x00bad0fc0009f0a2
   0x00bad0fc0009f0b2
   0x00bad0fc0033f1a2
   0x00bad0fc0033f1b2
   0x00bad00017fcf2a2
   0x00bad00017fcf2b2
   0x00bad00005fcf3a2
   0x00bad00005fcf3b2
   0x00bad00003fcf4a2
   0x00bad00003fcf4b2
   0x00bad00007fcf5a2
   0x00bad00007fcf5b2
   0x00bad0fc0011f6a2
   0x00bad0fc0011f6b2
   0x00bad0b00002f7a2
   0x00bad0b00002f7b2
   0x00bad0b00001f8a2
   0x00bad0b00001f8b2

7. Save the list on the Linux InfiniBand host as the /etc/opensm/guid.txt file.

8. Set the permissions for the /etc/opensm/guid.txt file:

   # chmod 0644 /etc/opensm/guid.txt
   #

9. Restart the Subnet Manager on the Linux InfiniBand host and instruct it to use the guid.txt file.

   For example:

   # /etc/init.d/opensmd stop
   Stopping IB Subnet Manager..-.                             [  OK  ]
   # /usr/sbin/opensm -R ftree -A -a /etc/opensm/guid.txt -s 120 -B

10. Power on the fabric cards.

    See Power On the Fabric Cards for Installation.

Related Information

• Switch Command Reference, getbaseguid command

• Switch Command Reference, opensm command

• Enable the Fabric Cards for Installation

• Installing the InfiniBand Software Stack