13.6.4. 创建 P_Key 定义

默认情况下，openm.conf 会查找文件 /etc/rdma/partitions.conf 以获取要在结构上创建的分区列表。所有光纤必须包含 0x7fff 子网，并且所有交换机和所有主机必须属于该结构。除此之外，还可以创建任何其他分区，并且所有主机和所有交换机都不必是这些额外分区的成员。这样，管理员可以创建与 InfiniBand 光纤上以太网 VLAN 类似的子网。如果分区定义了给定速度（如 40 Gbps），并且网络上有一个主机无法执行 40 Gbps，那么该主机即使有权限加入分区也将无法加入分区，因为它不能满足速度要求，因此建议将分区速度设置为任何有权加入分区的主机速度最慢。如果某些主机子集需要更快的分区，请创建一个速度较高的不同分区。

以下分区文件将导致默认的 0x7fff 分区速度降低 10 Gbps，以及速度为 40 Gbps 的 0x0002 分区：

~]$ more /etc/rdma/partitions.conf
# For reference:
# IPv4 IANA reserved multicast addresses:
#   http://www.iana.org/assignments/multicast-addresses/multicast-addresses.txt
# IPv6 IANA reserved multicast addresses:
#   http://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast-addresses.xml
#
# mtu =
#   1 = 256
#   2 = 512
#   3 = 1024
#   4 = 2048
#   5 = 4096
#
# rate =
#   2  =   2.5 GBit/s
#   3  =  10   GBit/s
#   4  =  30   GBit/s
#   5  =   5   GBit/s
#   6  =  20   GBit/s
#   7  =  40   GBit/s
#   8  =  60   GBit/s
#   9  =  80   GBit/s
#   10 = 120   GBit/s

Default=0x7fff, rate=3, mtu=4, scope=2, defmember=full:
        ALL, ALL_SWITCHES=full;
Default=0x7fff, ipoib, rate=3, mtu=4, scope=2:
        mgid=ff12:401b::ffff:ffff       # IPv4 Broadcast address
        mgid=ff12:401b::1               # IPv4 All Hosts group
        mgid=ff12:401b::2               # IPv4 All Routers group
        mgid=ff12:401b::16              # IPv4 IGMP group
        mgid=ff12:401b::fb              # IPv4 mDNS group
        mgid=ff12:401b::fc              # IPv4 Multicast Link Local Name Resolution group
        mgid=ff12:401b::101             # IPv4 NTP group
        mgid=ff12:401b::202             # IPv4 Sun RPC
        mgid=ff12:601b::1               # IPv6 All Hosts group
        mgid=ff12:601b::2               # IPv6 All Routers group
        mgid=ff12:601b::16              # IPv6 MLDv2-capable Routers group
        mgid=ff12:601b::fb              # IPv6 mDNS group
        mgid=ff12:601b::101             # IPv6 NTP group
        mgid=ff12:601b::202             # IPv6 Sun RPC group
        mgid=ff12:601b::1:3             # IPv6 Multicast Link Local Name Resolution group
        ALL=full, ALL_SWITCHES=full;

ib0_2=0x0002, rate=7, mtu=4, scope=2, defmember=full:
        ALL, ALL_SWITCHES=full;
ib0_2=0x0002, ipoib, rate=7, mtu=4, scope=2:
        mgid=ff12:401b::ffff:ffff       # IPv4 Broadcast address
        mgid=ff12:401b::1               # IPv4 All Hosts group
        mgid=ff12:401b::2               # IPv4 All Routers group
        mgid=ff12:401b::16              # IPv4 IGMP group
        mgid=ff12:401b::fb              # IPv4 mDNS group
        mgid=ff12:401b::fc              # IPv4 Multicast Link Local Name Resolution group
        mgid=ff12:401b::101             # IPv4 NTP group
        mgid=ff12:401b::202             # IPv4 Sun RPC
        mgid=ff12:601b::1               # IPv6 All Hosts group
        mgid=ff12:601b::2               # IPv6 All Routers group
        mgid=ff12:601b::16              # IPv6 MLDv2-capable Routers group
        mgid=ff12:601b::fb              # IPv6 mDNS group
        mgid=ff12:601b::101             # IPv6 NTP group
        mgid=ff12:601b::202             # IPv6 Sun RPC group
        mgid=ff12:601b::1:3             # IPv6 Multicast Link Local Name Resolution group
        ALL=full, ALL_SWITCHES=full;