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

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适用场景

ONTAP 9
NFSv4.1
pNFS
RedHat

问题描述

客户端 <> 存储将继续执行 pNFS I/O
由于交换机问题描述，网络已关闭
重新建立 TCP 连接后，客户端将开始发送非 pNFS I/O 请求
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
根据 RFC 8881，客户端无法从存储处理此延迟的 NFS4ERR_SEQ_MISORDER 响应
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