DB2 pureScale 常用命令总结系列（四）uDAPL/IB部分

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uDAPL and InfiniBand
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1.uDAPL的全称
User-Level Direct Access Programming Library (uDAPL.)
 (user Direct Access Programming Language)
used with InfiniBand to perform RDMA (Remote Direct Memory Access)

2.pureScale各个member通过IB channel上的uDAPL接口来和CF通信
All members communicate to both CFs using uDAPL over an InfiniBand channel
    -Members use the CF client API
    -CF Server (ca-server) communicates with CF client API (member, db2sysc) over InfiniBand

3. InfiniBand
    -Channel that communication goes over
    -Comparable to ethernet
    -Communication aside from uDAPL may also be done over IB
        rsh, ssh, etc

4. InfiniBand Supported Cards
    For AIX: Galaxy 2 cards, for Linux: Melanox

5. AIX操作系统 uDAPL/IB 信息收集
uDAPL/IB Info to Collect/View

Listed here are pieces of info that may be viewed on a live system (AIX)
    --5.1 errpt –a
                -Look for error messages from IB
    --5.2 ping <hostname>
                -From and to each host to see if hosts are still able to communicate over IB
    --5.3 lsdev –C
                -Check if the devices are still available:
                
                coralpib07:/home/svtdbm6 >lsdev -C | grep -i infiniband
                ib0         Available          IP over Infiniband Network Interface
                iba0        Available          InfiniBand host channel adapter
                icm         Available          Infiniband Communication Manager

    --5.4 ibstat -v
                -shows IB adapter information IB configuration
    --5.5 ifconfig -a
                -shows all adapters' information on the host
    --5.6 ifconfig <interface name>
                -Similar to ifconfig –a. In a few cases may provide added info
    --5.7 arp -t ib –a
                -shows who the current host last communicated with; other hosts in the cluster should be listed here
    --5.8 snap –Y (if not already collected)
                -Work going in to dump this automatically in FODC directories
                -**Most important if not already dumped
    --5.9 Many of these now integrated into snap –Y and db2support
        
6.Linux操作系统下 uDAPL/IB信息收集
uDAPL/IB Info to Collect/View
        
    --6.1 /var/log/messages
                -Look for error messages from IB
                -additional logging into this log also possible
    --6.2 ping <hostname>
                -From and to each host to see if hosts are still able to communicate over IB
    --6.3 ibstat
                -shows IB adapter information IB configuration
    --6.4 ifconfig –a
                -shows all adapters' information on the host
    --6.5 ibswportwatch.pl
                -Gives hints to when there may be lost packets

7.uDAPL Terminology
        uDAPL – user Direct Access Programming Language
        RDMA – Remote Direct Memory Access
        IB – InfiniBand
        ICM – InfiniBand Communication Manager
        EP - Endpoint
        MRB - Message Response Block
        MCB - Message Command Block
        EVD - Event Dispatcher
        CQ - Completion Queue
        QP - Queue Pair ( SEND/RECIEVE)
        DAT - Direct Access Transport
        DTO - Data transfer Operation
        LID - Location Identifier
        HCA - Host Channel Adapter