WAAS - NFS AO故障排除

章节：排除NFS AO故障

本文介绍如何排除NFS AO故障。

目录

• 1 NFS加速器故障排除
• 2 NFS AO日志记录

NFS加速器故障排除

NFS加速器可优化NFSv3流量。其他NFS版本未由NFS AO优化。

您可以使用show accelerator和show license命令验证常规AO配置和状态，如排除应用加速故障文章中所述。NFS加速器操作需要企业许可证。

接下来，使用show accelerator nfs命令验证特定于NFS AO的状态，如图1所示。您希望看到NFS AO已启用、运行和注册，并且显示连接限制。如果配置状态为启用，但操作状态为关闭，则表示许可问题。

图1.检验NFS加速器状态

使用show running-config命令验证NFS流量策略是否已正确配置。您希望看到文件系统应用程序分类器NFS操作的加速nfs ，并且希望看到为NFS分类器列出的适当匹配条件，如下所示：

WAE674# sh run | include NFS
      name File-System classifier NFS action optimize full accelerate nfs       <-------------

WAE674# sh run | begin NFS
...skipping
   classifier NFS
      match dst port eq 2049                                                    <-------------
   exit

使用show statistics connection optimized nfs命令检查WAAS设备是否正在建立优化的NFS连接。验证NFS连接的Accel列中是否显示“N”，这表示已使用NFS AO。

WAE674# sh stat conn opt nfs
D:DRE,L:LZ,T:TCP Optimization,
C:CIFS,E:EPM,G:GENERIC,H:HTTP,M:MAPI,N:NFS,S:SSL,V:VIDEO,

ConnID  Local IP:Port         Remote IP:Port        PeerID             Accelerator 
582     10.56.94.101:33606    10.56.94.80:2049      0:1a:64:d3:2f:b8   NTDL         <-----Look for "N"

使用show statistics accelerator nfs命令验证以下内容：

• NFS流量是NFSv3。查看Total RPC Calls per NFS Version（每NFS版本的RPC调用总数）字段。该字段的输出是一个包含5个值的数组，您希望看到大部分NFSv3流量，该流量在第4个计数器中报告。其他阵列位置的高数字表示其他NFS版本。
• NFS流量未加密。查看Total RPC Calls per Authentication Flavor字段。该字段的输出是一个包含4个值的数组，您希望看到大多数未加密的流量，这对应于前3个计数器。最后一个计数器中的高数字表示加密的NFS流量。另请选中Total RPC Calls with Unknown Authentication Flavor字段，在该字段中，您希望看到0或小数，因为这些连接未优化。
• NFS连接是异步的。验证Percentage of Requests Served Locally（本地服务的请求百分比）字段是否为非零。

WAE# sh statistics accelerator nfs
 
NFS:
  Global Statistics
  -----------------
  Time Accelerator was started:                                      Fri Oct 23
16:40:06 2009
  Time Statistics were Last Reset/Cleared:                           Fri Oct 23
16:40:06 2009
  Total Handled Connections:                                         170      
  Total Optimized Connections:                                       170      
  Total Connections Handed-off with Compression Policies Unchanged:  0        
  Total Dropped Connections:                                         0        
  Current Active Connections:                                        0        
  Current Pending Connections:                                       0        
  Maximum Active Connections:                                        13       
  Total RPC Calls per Authentication Flavor:                         65        
298544    0         0                                                          <----Should see 0 or few in last field 
  Total RPC Calls with Unknown Authentication Flavor:                0         <----Should see 0 or few
  Total RPC Calls per NFS Version:                                   0         
0         0         298609    0                                                <----Should see 0 or few in first two and last fields
  Total RPC Calls with Unknown NFS Version:                          0         <----Should see 0 or few
  Total Requests:                                                    298609   
  Total Local Replies:                                               191713   
  Percentage of Requests Served Locally:                             64        <----Should be nonzero
  Percentage of Requests Served Remotely:                            36       
  Average Time to Generate Local READ Reply (ms):                    15       
  Average Time to Generate Local WRITE Reply (ms):                   0        
  Average Time to Generate Local GETATTR Reply (ms):                 0        
  Average Time to Generate Local Reply (ms):                         0        
  Average Time to Receive Remote Reply (ms):                         10       
  Meta-Data Cache Access Count:                                      206017   
  Meta-Data Cache Hit Count:                                         191673   
  Remaining Number Of Entries in Meta-Data Cache:                    128926   
  Meta-Data Cache Hit Ratio:                                         93        

您可以使用show statistics connection optimized nfs detail命令查看NFS连接统计信息，如下所示：

WAE674# show stat conn opt nfs detail
Connection Id:            1916
   Peer Id:                  00:14:5e:84:24:5f
   Connection Type:          EXTERNAL CLIENT
   Start Time:               Thu Jun 25 07:09:09 2009
   Source IP Address:        10.10.10.20
   Source Port Number:       928
   Destination IP Address:   10.10.100.102
   Destination Port Number:  2049
   Application Name:         File-System                                  <-----Should see File-System
   Classifier Name:          NFS                                          <-----Should see NFS
   Map Name:                 basic
   Directed Mode:            FALSE
   Preposition Flow:         FALSE
   Policy Details:
          Configured:        TCP_OPTIMIZE + DRE + LZ
             Derived:        TCP_OPTIMIZE + DRE + LZ
                Peer:        TCP_OPTIMIZE + DRE + LZ
          Negotiated:        TCP_OPTIMIZE + DRE + LZ
             Applied:        TCP_OPTIMIZE + DRE + LZ
   Accelerator Details:
               Configured:   NFS                                          <-----Should see NFS configured
                  Derived:   NFS
                  Applied:   NFS                                          <-----Should see NFS applied
                     Hist:   None
                                               Original            Optimized
                                   -------------------- --------------------
   Bytes Read:                                     5120                 4639
   Bytes Written:                                 28136                 1407
. . .

NFS : 1916

   Time Statistics were Last Reset/Cleared:                           Thu Jun 25
 07:09:09 2009
   Total Bytes Read:                                                  5120
28136
   Total Bytes Written:                                               28136
5120
   Bit Flags for I/O state:                                           19
   Histogram of Buffers Read From Local Endpoint:                     31
1         0         0         0
   Total NFS Requests:                                                32
   Total Replies Served Locally:                                      4
   Percentage of Requests Served Locally:                             12
   Percentage of Requests Served Remotely:                            88
   Average Time to Generate Local READ Reply (ms):                    0
   Average Time to Generate Local WRITE Reply (ms):                   0
   Average Time to Generate Local GETATTR Reply (ms):                 0
   Average Time to Generate Local Reply (ms):                         0
   Average Time to Receive Remote Reply (ms):                         103
   Total RPC Procedure Calls:                                         0
9         0         10        7         0         4         1         0
0         0         0         0         0         0         0         0
1         0         0         0         0
. . .

 Total Unknown RPC Procedure Calls:                                    0
  Total Write RPCs Using Stable-how Enumerated Values:               0
0         1
  Total WRITE RPCs with Invalid Stable-how Value:                    0
  Bytes Buffered for READ Purpose:                                   0
  Start Time of Session:                                             Thu Jun 25
07:09:09 2009

  Meta-Data Cache Access Count:                                      9
  Meta-Data Cache Hit Count:                                         4
  Remaining Number Of Entries in Meta-Data Cache:                    1000
  Meta-Data Cache Hit Ratio:                                         44
  Current number of entries in Meta-Data Cache:                      0
. . . 

NFS AO日志记录

以下日志文件可用于排除NFS AO问题：

• 事务日志文件：/local1/logs/tfo/working.log（和/local1/logs/tfo/tfo_log_*.txt）
• 调试日志文件：/local1/errorlog/nfsao-errorlog.current（和nfsao-errorlog.*）

为便于调试，您应首先设置ACL，将数据包限制到一台主机。

WAE674(config)# ip access-list extended 150 permit tcp host 10.10.10.10 any
WAE674(config)# ip access-list extended 150 permit tcp any host 10.10.10.10

要启用事务记录，请按如下方式使用transaction-logs配置命令：

wae(config)# transaction-logs flow enable
wae(config)# transaction-logs flow access-list 150

可以使用type-tail命令查看事务日志文件的结尾。

要设置并启用NFS AO的调试日志记录，请使用以下命令。

NOTE:调试日志记录占用大量CPU资源，并且可以生成大量输出。在生产环境中谨慎、谨慎地使用它。

您可以按如下方式启用详细的日志记录到磁盘：

WAE674(config)# logging disk enable
WAE674(config)# logging disk priority detail

您可以为ACL中的连接启用调试日志记录，如下所示：

WAE674# debug connection access-list 150

NFS AO调试的选项如下：

WAE674# debug accelerator nfs ?
  all               enable all accelerator debugs
  async-write       enable async write optimization debugs
  attributes-cache  enable attributes-cache optimization debugs
  nfs-v3            enable NFSv3 layer debugs
  read-ahead        enable read ahead optimization debugs
  rpc               enable RPC layer debugs
  shell             enable shell (infra) debugs
  utils             enable utils debugs

您可以为NFS连接启用调试日志记录，然后显示调试错误日志的结尾，如下所示：

WAE674# debug accelerator nfs all
WAE674# type-tail errorlog/nfsao-errorlog.current follow