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如果存储响应 NFS4ERR_DELAY 且后跟 NFS4ERR_SEQ_MISORDER ,则 NFS 客户端将挂起

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Category:
fas-systems<a>NFSv4.1</a><a>pNFS</a><a>客户端挂起</a><a>2009102119</a>
Specialty:
nfs
Last Updated:

适用场景

  • ONTAP 9
  • NFSv4.1
  • pNFS
  • RedHat

问题描述

  1. 客户端 <> 存储将继续执行 pNFS I/O
  2. 由于交换机问题描述 ,网络已关闭
  3. 重新建立 TCP 连接后,客户端将开始发送非 pNFS I/O 请求
  4. 对于这些非 pNFS I/O 请求,存储系统将返回 NFS4ERR_delay ,而不是 NFS4ERR_SEQ_MISORDER
  5. 根据 RFC 8881,客户端无法从存储处理此延迟的 NFS4ERR_SEQ_MISORDER 响应
  6. 客户端 <> 存储卡在无限环路中(挂起)
 
示例:
 
网络关闭前:
 
608 2022-03-02 20:32:07.696321 1.745212 client_ip storage_ip 224 NFS 0x0002598a 0 12272513024 V4 Call READ StateID: 0xc7c1 Offset: 12272513024 Len: 4096
( pNFS V4 调用)
 
因交换机问题描述 而关闭网络 > 启动后
 
628 2022-03-02 20:32:44.479467 0.000027 client_ip storage_ip 208 NFS 0x0002598b 0 12272513024 V4 Call (Reply In 636) READ StateID: 0xc7c1 Offset: 12272513024 Len: 4096
(非 pNFS V4 调用)
 
629 2022-03-02 20:32:44.479473 0.000006 client_ip 172.26.57.218 228 NFS 0x00002f7c 3 0 V4 Call (Reply In 638) LAYOUTRETURN
(非 pNFS V4 调用)
 
636 2022-03-02 20:32:45.479110 0.000015 storage_ip client_ip 48 NFS V4 Reply (Call In 628) SEQUENCE Status: NFS4ERR_DELAY
 
638 2022-03-02 20:32:45.479116 0.000001 storage_ip client_ip 48 NFS V4 Reply (Call In 629) SEQUENCE Status: NFS4ERR_DELAY
 
645 2022-03-02 20:33:00.487253 0.000081 client_ip storage_ip 568 NFS 0x00002f7c,0x0002598b,0x0000afae 3,0,1 0,12272513024 V4 Call (Reply In 649) LAYOUTRETURN ; V4 Call (Reply In 651) READ StateID: 0xc7c1 Offset: 12272513024 Len: 4096 ; V4 Call (Reply In 652) SEQUENCE
(非 pNFS V4 调用)
 
649 2022-03-02 20:33:01.487050 0.000010 storage_ip client_ip 48 NFS V4 Reply (Call In 645) SEQUENCE Status: NFS4ERR_DELAY
 
662 2022-03-02 20:33:16.607231 0.000046 client_ip storage_ip 628 NFS 0x00004985,0x0002598b,0x00002f7c 2,0,3 12272513024,0 V4 Call (Reply In 666) GETATTR FH: 0x6769b2c2 ; V4 Call (Reply In 668) READ StateID: 0xc7c1 Offset: 12272513024 Len: 4096 ; V4 Call (Reply In 670)
(非 pNFS V4 调用)
 
670 2022-03-02 20:33:17.607069 0.000004 storage_ip client_ip 48 NFS V4 Reply (Call In 662) SEQUENCE Status: NFS4ERR_DELAY
 
683 2022-03-02 20:33:32.671209 0.000037 client_ip storage_ip 568 NFS 0x00002f7c,0x0002598b,0x0000afae 3,0,1 0,12272513024 V4 Call (Reply In 684) LAYOUTRETURN ; V4 Call (Reply In 686) READ StateID: 0xc7c1 Offset: 12272513024 Len: 4096 ; V4 Call (Reply In 688) SEQUENCE
(非 pNFS V4 调用)
 
684 2022-03-02 20:33:32.671406 0.000197 storage_ip client_ip 104 NFS 0x00002f7c 3 V4 Reply (Call In 683) LAYOUTRETURN
 
697 2022-03-02 20:33:47.679159 3.935932 client_ip storage_ip 208 NFS 0x0002598b 0 12272513024 V4 Call (Reply In 698) READ StateID: 0xc7c1 Offset: 12272513024 Len: 4096
(non-pNFS V4 call)
 
698 2022-03-02 20:33:47.679338 0.000179 storage_ip client_ip 48 NFS V4 Reply (Call In 697) SEQUENCE Status: NFS4ERR_SEQ_MISORDERED

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