- Owner's Guide
- Extending Oracle Zero Data Loss Recovery Appliance
- Extending a Rack by Adding Another Rack
- Cabling Several Racks Together
- Cabling Several RoCE Network Fabric Racks Together using Oracle Exadata System Software Release 20.1.0 or Later
Cabling Several RoCE Network Fabric Racks Together using Oracle Exadata System Software Release 20.1.0 or Later
Use this procedure to add another rack to an existing multi-rack system with RoCE Network Fabric using Oracle Exadata System Software Release 20.1.0 or later.
This procedure is for systems with RoCE Network Fabric (X8M or later).
In this procedure, the existing racks are R1, R2, … ,Rn, and the new rack is Rn+1. In the following steps, these example switch names are used:
rack5sw-roces0
: Rack 5 Spine switch (SS)rack5sw-rocea0
: Rack 5 Lower Leaf switch (R5LL)rack5sw-roceb0
: Rack 5 Upper Leaf switch (R5UL)
Note:
Cabling three or more racks together requires no downtime for the existing racks R1, R2, …, Rn. Only the new rack, Rn+1, is powered downUse the applicable cabling tables depending on your system:
- Ensure the new rack is near the existing racks R1, R2, …, Rn.The RDMA Network Fabric cables must be able to reach the servers in each rack.
- Ensure you have a backup of the current switch configuration for each switch in the existing racks and the new rack.For each switch, complete the steps in the Oracle Exadata Database Machine Maintenance Guide, section Backing Up Settings on the RoCE Network Fabric Switch.
- Shut down all servers in the new rack Rn+1.Refer to Powering Off Oracle Exadata Rack. The switches must remain online and available.
- Apply the golden configuration settings on the RoCE Network Fabric switches in the new rack Rn+1.
Use the procedure described in Applying Golden Configuration Settings on RoCE Network Fabric Switches, in Oracle Exadata Database Machine Maintenance Guide.
- Perform the physical cabling of the switches in the new rack Rn+1.
Caution:
Cabling within a live network must be done carefully in order to avoid potentially serious disruptions.- Remove the eight existing inter-switch connections between each leaf switch in the new rack Rn+1 (ports 4, 5, 6, 7 and 30, 31, 32, 33).
- Cable the leaf switches in the new rack according to the applicable
cabling table.
For example, if you are adding a 5th rack and rack Rn+1 is R5, then use "Table 24-14 Leaf Switch Connections for the Fifth Rack in a Five-Rack System".
- Add the new rack to the switches in the existing racks (R1 to Rn).
- For an existing rack (Rx), cable the lower leaf switch RxLL according to the applicable cabling table.
- For the same rack, cable the upper leaf switch RxUL according to the applicable cabling table.
- Repeat these steps for each existing rack, R1 to Rn.
- Confirm each switch is available and connected.
For each switch in racks R1, R2, …, Rn, Rn+1, confirm the output for the switch
show interface status
command showsconnected
and100G
. In the following example, the leaf switches are ports Eth1/4 to Eth1/7, and Eth1/30 to Eth1/33. The spine switches are ports Eth1/5 to Eth1/20.When run from a spine switch, the output should be similar to the following:
rack1sw-roces0# show interface status -------------------------------------------------------------------------------- Port Name Status Vlan Duplex Speed Type -------------------------------------------------------------------------------- mgmt0 -- connected routed full 1000 -- -------------------------------------------------------------------------------- Port Name Status Vlan Duplex Speed Type -------------------------------------------------------------------------------- ... Eth1/5 RouterPort5 connected routed full 100G QSFP-100G-CR4 Eth1/6 RouterPort6 connected routed full 100G QSFP-100G-SR4 Eth1/7 RouterPort7 connected routed full 100G QSFP-100G-CR4 Eth1/8 RouterPort8 connected routed full 100G QSFP-100G-SR4 Eth1/9 RouterPort9 connected routed full 100G QSFP-100G-CR4 Eth1/10 RouterPort10 connected routed full 100G QSFP-100G-SR4 Eth1/11 RouterPort11 connected routed full 100G QSFP-100G-CR4 Eth1/12 RouterPort12 connected routed full 100G QSFP-100G-SR4 Eth1/13 RouterPort13 connected routed full 100G QSFP-100G-CR4 Eth1/14 RouterPort14 connected routed full 100G QSFP-100G-SR4 Eth1/15 RouterPort15 connected routed full 100G QSFP-100G-CR4 Eth1/16 RouterPort16 connected routed full 100G QSFP-100G-SR4 Eth1/17 RouterPort17 connected routed full 100G QSFP-100G-CR4 Eth1/18 RouterPort18 connected routed full 100G QSFP-100G-SR4 Eth1/19 RouterPort19 connected routed full 100G QSFP-100G-CR4 Eth1/20 RouterPort20 connected routed full 100G QSFP-100G-SR4 Eth1/21 RouterPort21 xcvrAbsen routed full 100G -- ...
When run from a leaf switch, the output should be similar to the following:
rack1sw-rocea0# show interface status -------------------------------------------------------------------------------- Port Name Status Vlan Duplex Speed Type -------------------------------------------------------------------------------- mgmt0 -- connected routed full 1000 -- -------------------------------------------------------------------------------- Port Name Status Vlan Duplex Speed Type -------------------------------------------------------------------------------- ... Eth1/4 RouterPort1 connected routed full 100G QSFP-100G-CR4 Eth1/5 RouterPort2 connected routed full 100G QSFP-100G-CR4 Eth1/6 RouterPort3 connected routed full 100G QSFP-100G-CR4 Eth1/7 RouterPort4 connected routed full 100G QSFP-100G-CR4 Eth1/8 celadm14 connected 3888 full 100G QSFP-100G-CR4 ... Eth1/29 celadm01 connected 3888 full 100G QSFP-100G-CR4 Eth1/30 RouterPort5 connected routed full 100G QSFP-100G-SR4 Eth1/31 RouterPort6 connected routed full 100G QSFP-100G-SR4 Eth1/32 RouterPort7 connected routed full 100G QSFP-100G-SR4 Eth1/33 RouterPort8 connected routed full 100G QSFP-100G-SR4 ...
- Check the neighbor discovery for every switch in racks R1, R2, …, Rn, Rn+1.Log in to each switch and use the
show lldp neighbors
command. Make sure that all switches are visible and check the switch ports assignment (leaf switches: ports Eth1/4 - Eth1/7, Eth1/30 - Eth1/33; spine switches: ports Eth1/5 - Eth1/20) against the applicable cabling tables.Each spine switch should see all the leaf switches in each rack, but not the other spine switches. The output for a spine switch should be similar to the following:
Note:
The interfaces in the rightmost output column (for example,Ethernet1/5
) are different for each switch based on the applicable cabling tables.rack1sw-roces0# show lldp neighbors | grep roce rack1sw-roceb0 Eth1/5 120 BR Ethernet1/5 rack2sw-roceb0 Eth1/6 120 BR Ethernet1/5 rack1sw-roceb0 Eth1/7 120 BR Ethernet1/7 rack2sw-roceb0 Eth1/8 120 BR Ethernet1/7 rack1sw-roceb0 Eth1/9 120 BR Ethernet1/4 rack2sw-roceb0 Eth1/10 120 BR Ethernet1/4 rack3sw-roceb0 Eth1/11 120 BR Ethernet1/5 rack3sw-roceb0 Eth1/12 120 BR Ethernet1/7 rack1sw-rocea0 Eth1/13 120 BR Ethernet1/5 rack2sw-rocea0 Eth1/14 120 BR Ethernet1/5 rack1sw-rocea0 Eth1/15 120 BR Ethernet1/7 rack2sw-rocea0 Eth1/16 120 BR Ethernet1/7 rack3sw-rocea0 Eth1/17 120 BR Ethernet1/5 rack2sw-rocea0 Eth1/18 120 BR Ethernet1/4 rack3sw-rocea0 Eth1/19 120 BR Ethernet1/7 rack3sw-rocea0 Eth1/20 120 BR Ethernet1/4
Each leaf switch should see the spine switch in every rack, but not the other leaf switches. The output for a leaf switch should be similar to the following:
Note:
The interfaces in the rightmost output column (for example,Ethernet1/13
) are different for each switch based on the applicable cabling tables.rack1sw-rocea0# show lldp neighbors | grep roce rack3sw-roces0 Eth1/4 120 BR Ethernet1/13 rack1sw-roces0 Eth1/5 120 BR Ethernet1/13 rack3sw-roces0 Eth1/6 120 BR Ethernet1/15 rack1sw-roces0 Eth1/7 120 BR Ethernet1/15 rack2sw-roces0 Eth1/30 120 BR Ethernet1/17 rack2sw-roces0 Eth1/31 120 BR Ethernet1/13 rack3sw-roces0 Eth1/32 120 BR Ethernet1/17 rack2sw-roces0 Eth1/33 120 BR Ethernet1/15
- Power on all the servers in the new rack, Rn+1.
- For each rack, confirm the multi-rack cabling by running the
verify_roce_cables.py
script.Refer to My Oracle Support Doc ID 2587717.1 for download and usage instructions.
Check the output of the
verify_roce_cables.py
script against the applicable cabling tables. Also, check that output in theCABLE OK?
columns contains theOK
status.When running the script, two input files are used, one for nodes and one for switches. Each file should contain the servers or switches on separate lines. Use fully qualified domain names or IP addresses for each server and switch.
The following output is a partial example of the command results:
# ./verify_roce_cables.py -n nodes.rack1 -s switches.rack1 SWITCH PORT (EXPECTED PEER) LEAF-1 (rack1sw-rocea0) : CABLE OK? LEAF-2 (rack1sw-roceb0) : CABLE OK? ----------- -------------- --------------------------- : -------- ----------------------- : --------- Eth1/4 (ISL peer switch) : rack1sw-roces0 Ethernet1/17 : OK rack1sw-roces0 Ethernet1/9 : OK Eth1/5 (ISL peer switch) : rack1sw-roces0 Ethernet1/13 : OK rack1sw-roces0 Ethernet1/5 : OK Eth1/6 (ISL peer switch) : rack1sw-roces0 Ethernet1/19 : OK rack1sw-roces0 Ethernet1/11: OK Eth1/7 (ISL peer switch) : rack1sw-roces0 Ethernet1/15 : OK rack1sw-roces0 Ethernet1/7 : OK Eth1/12 (celadm10) : rack1celadm10 port-1 : OK rack1celadm10 port-2 : OK Eth1/13 (celadm09) : rack1celadm09 port-1 : OK rack1celadm09 port-2 : OK Eth1/14 (celadm08) : rack1celadm08 port-1 : OK rack1celadm08 port-2 : OK ... Eth1/15 (adm08) : rack1dbadm08 port-1 : OK rack1dbadm08 port-2 : OK Eth1/16 (adm07) : rack1dbadm07 port-1 : OK rack1dbadm07 port-2 : OK Eth1/17 (adm06) : rack1dbadm06 port-1 : OK rack1dbadm06 port-2 : OK ... Eth1/30 (ISL peer switch) : rack2sw-roces0 Ethernet1/17 : OK rack2sw-roces0 Ethernet1/9 : OK Eth1/31 (ISL peer switch) : rack2sw-roces0 Ethernet1/13 : OK rack2sw-roces0 Ethernet1/5 : OK Eth1/32 (ISL peer switch) : rack2sw-roces0 Ethernet1/19 : OK rack2sw-roces0 Ethernet1/11: OK Eth1/33 (ISL peer switch) : rack2sw-roces0 Ethernet1/15 : OK rack2sw-roces0 Ethernet1/7 : OK
- Verify the RoCE Network Fabric operation by
using the
infinicheck
command.Use the following recommended command sequence. In each command,
hosts.lst
contains a list of database server host names or RoCE Network Fabric IP addresses (2 RoCE Network Fabric IP addresses for each database server), andcells.lst
contains a list of RoCE Network Fabric IP addresses for the storage servers (2 RoCE Network Fabric IP addresses for each storage server).-
Use
infinicheck
with the-z
option to clear the files that were created during the last run of theinfinicheck
command. For example:# /opt/oracle.SupportTools/ibdiagtools/infinicheck -g hosts.lst -c cells.lst -z
-
Use
infinicheck
with the-s
option to set up user equivalence for password-less SSH across the RoCE Network Fabric. For example:# /opt/oracle.SupportTools/ibdiagtools/infinicheck -g hosts.lst -c cells.lst -s
-
Finally, verify the RoCE Network Fabric operation by using
infinicheck
with the-b
option, which is recommended on newly imaged machines where it is acceptable to suppress thecellip.ora
andcellinit.ora
configuration checks. For example:# /opt/oracle.SupportTools/ibdiagtools/infinicheck -g hosts.lst -c cells.lst -b INFINICHECK [Network Connectivity, Configuration and Performance] #### FABRIC TYPE TESTS #### System type identified: RoCE Verifying User Equivalance of user=root from all DBs to all CELLs. #### RoCE CONFIGURATION TESTS #### Checking for presence of RoCE devices on all DBs and CELLs [SUCCESS].... RoCE devices on all DBs and CELLs look good Checking for RoCE Policy Routing settings on all DBs and CELLs [SUCCESS].... RoCE Policy Routing settings look good Checking for RoCE DSCP ToS mapping on all DBs and CELLs [SUCCESS].... RoCE DSCP ToS settings look good Checking for RoCE PFC settings and DSCP mapping on all DBs and CELLs [SUCCESS].... RoCE PFC and DSCP settings look good Checking for RoCE interface MTU settings. Expected value : 2300 [SUCCESS].... RoCE interface MTU settings look good Verifying switch advertised DSCP on all DBs and CELLs ports ( ) [SUCCESS].... Advertised DSCP settings from RoCE switch looks good #### CONNECTIVITY TESTS #### [COMPUTE NODES -> STORAGE CELLS] (60 seconds approx.) (Will walk through QoS values: 0-6) [SUCCESS]..........Results OK [SUCCESS]....... All can talk to all storage cells [COMPUTE NODES -> COMPUTE NODES] ...
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