MDM 未同步时 PowerFlex 切换失败

Summary: 网络连接问题导致辅助 MDM 状态变为“Not synchronized”。

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Symptoms

场景
主 MDM 和辅助 MDM 之间一致的 MDM 断开连接和连接问题会导致辅助 MDM 状态变为“Not synchronized”。

症状
主 MDM 和辅助 MDM 之间缺乏一致的连接会显示以下症状：

scli --query_cluster 的输出显示辅助 MDM 已断开连接。

scli --query_cluster 的输出显示辅助 MDM 未同步。

Cmatrix 显示重建已卡住。

SDC<>SDS 连接问题（SDS 驻留在有问题的 MDM 上）。

query_all output:

(info) Notice the Secondary MDMs' status.

Status: Not synchronized

Cluster:
    Name: parsio, ID: 06002ca3767a6153, Mode: 5_node, State: Degraded, Active: 5/5, Replicas: 1/3
    Virtual IPs: 192.168.20.100
Master MDM:
    Name: parsiomanager2, ID: 0x148190e6333dbc12
        IPs: 192.168.20.2, Management IPs: 10.8.8.56, Port: 9011, Virtual IP interfaces: eth1
        Version: 2.6.10000
        Actor ID: 0x1d0ac48b18c6f742, Voter ID: 0x2bb7b8b1353f6a82
        Certificate Info:
            Subject:    /GN=MDM/CN=ScaleIO-10-8-8-56/L=Hopkinton/ST=Massachusetts/C=US/O=EMC/OU=ASD
            Issuer:     /GN=MDM/CN=ScaleIO-10-8-8-56/L=Hopkinton/ST=Massachusetts/C=US/O=EMC/OU=ASD
            Valid From: Apr  2 11:25:03 2019 GMT
            Valid To:   Mar 31 12:25:03 2029 GMT
            Thumbprint: 60:C0:50:38:FC:3D:49:D5:00:8F:9F:CE:4F:27:D2:23:A1:E3:07:AF
Slave MDMs:
    Name: parsiomanager1, ID: 0x51ddc23b3cddea90
        IPs: 192.168.20.1, Management IPs: 10.8.8.54, Port: 9011, Virtual IP interfaces: eth1
        Status: Not synchronized, Version: 2.6.10000
        Actor ID: 0x641bc8002b885d00, Voter ID: 0x06f3ab9245ee83d0, Replication State: Synchronization in-progress
        Certificate Info:
            Subject:    /GN=MDM/CN=ScaleIO-10-8-8-54/L=Hopkinton/ST=Massachusetts/C=US/O=EMC/OU=ASD
            Issuer:     /GN=MDM/CN=ScaleIO-10-8-8-54/L=Hopkinton/ST=Massachusetts/C=US/O=EMC/OU=ASD
            Valid From: Apr  2 11:33:08 2019 GMT
            Valid To:   Mar 31 12:33:08 2029 GMT
            Thumbprint: A3:49:37:C3:66:2F:53:05:96:2D:74:10:1F:D2:DF:A4:E7:F5:85:7B
    Name: parsiomanager3, ID: 0x3bf30e1a42079e61
        IPs: 192.168.20.4, Management IPs: 10.8.8.59, Port: 9011, Virtual IP interfaces: eth1
        Status: Not synchronized, Version: 2.6.10000
        Actor ID: 0x667027d528ddfcd1, Voter ID: 0x493913d41133d6b1, Replication State: Synchronization in-progress
        Certificate Info:
            Subject:    /GN=MDM/CN=ScaleIO-10-8-8-59/L=Hopkinton/ST=Massachusetts/C=US/O=EMC/OU=ASD
            Issuer:     /GN=MDM/CN=ScaleIO-10-8-8-59/L=Hopkinton/ST=Massachusetts/C=US/O=EMC/OU=ASD
            Valid From: Apr  2 10:17:11 2019 GMT
            Valid To:   Mar 31 11:17:11 2029 GMT
            Thumbprint: E9:10:DD:56:E9:2D:C8:6F:ED:D8:57:75:FF:DF:BB:15:41:FA:C1:32
Tie-Breakers:
    Name: parsiotb1, ID: 0x3c5587221ac0cfe4
        IPs: 192.168.20.3, Port: 9011
        Status: Normal, Version: 2.6.10000
        Voter ID: 0x683fd39d2af27284
    Name: parsiotb2, ID: 0x20c2b3f30969f533
        IPs: 192.168.20.5, Port: 9011
        Status: Normal, Version: 2.6.10000

MDM 事件：

（信息）请注意 MDM 和 SDC 与 SDS 的多个断开连接，示例如下。

MDM，ID 51ddc23b3cddea90，连接中断。
MDM（ID 3bf30e1a42079e61）无响应。
SDC ID：9503ac9800000003 与 SDS parsioesx02.ansys.com-ESX 的 IP 192.168.20.2 断开连接;编号：10d84abe00000002

4856 2020-12-01 12:19:38.735 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 51ddc23b3cddea90, lost connection 
4857 2020-12-01 12:19:38.204 MDM_CLUSTER_CONNECTED INFO The MDM, ID 51ddc23b3cddea90, connected 
4858 2020-12-01 12:19:43.397 MDM_CLUSTER_NOT_RESPOND WARNING The MDM, ID 3bf30e1a42079e61, is not responding 
4859 2020-12-01 12:19:44.824 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 3bf30e1a42079e61, lost connection 
4860 2020-12-01 12:19:44.203 MDM_CLUSTER_CONNECTED INFO The MDM, ID 3bf30e1a42079e61, connected 
4861 2020-12-01 12:19:44.569 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 51ddc23b3cddea90, lost connection 
4862 2020-12-01 12:19:44.701 MDM_CLUSTER_CONNECTED INFO The MDM, ID 51ddc23b3cddea90, connected 
4863 2020-12-01 12:19:45.276 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 51ddc23b3cddea90, lost connection 
4864 2020-12-01 12:19:45.397 MDM_CLUSTER_CONNECTED INFO The MDM, ID 51ddc23b3cddea90, connected 
4865 2020-12-01 12:19:48.480 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 3bf30e1a42079e61, lost connection 
4866 2020-12-01 12:19:48.601 MDM_CLUSTER_CONNECTED INFO The MDM, ID 3bf30e1a42079e61, connected 
4867 2020-12-01 12:19:49.431 SDC_DISCONNECTED_FROM_SDS_IP WARNING SDC ID: 9503ac9800000003 disconnected from IP 192.168.20.2 of SDS parsioesx02.ansys.com-ESX; ID: 10d84abe00000002 
4868 2020-12-01 12:19:50.377 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 51ddc23b3cddea90, lost connection 
4869 2020-12-01 12:19:50.403 SDC_CONNECTED_TO_SDS_IP INFO SDC ID: 9503ac9800000003 is now connected to IP 192.168.20.2 of SDS parsioesx02.ansys.com-ESX; ID: 10d84abe00000002 
4870 2020-12-01 12:19:50.498 MDM_CLUSTER_CONNECTED INFO The MDM, ID 51ddc23b3cddea90, connected 
4871 2020-12-01 12:19:51.183 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 3bf30e1a42079e61, lost connection 
4872 2020-12-01 12:19:51.304 MDM_CLUSTER_CONNECTED INFO The MDM, ID 3bf30e1a42079e61, connected 
4873 2020-12-01 12:19:53.669 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 51ddc23b3cddea90, lost connection 
4874 2020-12-01 12:19:53.800 MDM_CLUSTER_CONNECTED INFO The MDM, ID 51ddc23b3cddea90, connected 
4875 2020-12-01 12:19:54.833 SDC_DISCONNECTED_FROM_SDS_IP WARNING SDC ID: 9503ac9800000003 disconnected from IP 192.168.20.2 of SDS parsioesx02.ansys.com-ESX; ID: 10d84abe00000002 
4876 2020-12-01 12:19:56.858 SDC_CONNECTED_TO_SDS_IP INFO SDC ID: 9503ac9800000003 is now connected to IP 192.168.20.2 of SDS parsioesx02.ansys.com-ESX; ID: 10d84abe00000002 
4877 2020-12-01 12:19:56.867 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 3bf30e1a42079e61, lost connection 
4878 2020-12-01 12:19:56.197 MDM_CLUSTER_CONNECTED INFO The MDM, ID 3bf30e1a42079e61, connected 
4879 2020-12-01 12:19:56.873 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 51ddc23b3cddea90, lost connection 
4880 2020-12-01 12:19:57.426 MDM_CLUSTER_CONNECTED INFO The MDM, ID 51ddc23b3cddea90, connected 
4881 2020-12-01 12:19:58.284 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 3bf30e1a42079e61, lost connection 
4882 2020-12-01 12:19:58.405 MDM_CLUSTER_CONNECTED INFO The MDM, ID 3bf30e1a42079e61, connected 
4883 2020-12-01 12:19:59.995 SDC_DISCONNECTED_FROM_SDS_IP WARNING SDC ID: 9503ac9800000003 disconnected from IP 192.168.20.2 of SDS parsioesx02.ansys.com-ESX; ID: 10d84abe00000002 
4884 2020-12-01 12:20:00.997 SDC_CONNECTED_TO_SDS_IP INFO SDC ID: 9503ac9800000003 is now connected to IP 192.168.20.2 of SDS parsioesx02.ansys.com-ESX; ID: 10d84abe00000002 
4885 2020-12-01 12:20:01.372 MDM_CLUSTER_LOST_CONNECTION WARNING The MDM, ID 51ddc23b3cddea90, lost connection 
4886 2020-12-01 12:20:01.503 MDM_CLUSTER_CONNECTED INFO The MDM, ID 51ddc23b3cddea90, connected

MDM trc.x：

（信息）请注意，多个梳子进入 DEGRADED 状态并开始重建，示例如下。

Multi-Head： f7c90002 Row：1022 降级->降级 （INITIATE_MIGRATE）

01/12 12:21:31.587572 0x7f24a0ad6eb0:multiHeadRow_MoveState_Inner:02966: [multiHead_HandleMigrate:892]: MultiHead: f7c90002 Row: 1022 DEGRADED->DEGRADED (INITIATE_MIGRATE) 
01/12 12:21:31.587578 0x7f24a0ad6eb0:multiHeadRow_MoveState_Inner:02966: [multiHead_HandleMigrate:892]: MultiHead: f7c90002 Row: 380 DEGRADED->DEGRADED (INITIATE_MIGRATE) 
...
01/12 12:21:31.590164 0x7f24a064deb0:mdmTgtMsg_SendAsyncAddSingleCombEX:04000: TgtId: 10d871cb00000000 CombId: 7be4000081e9 CombState: SECONDARY raid: [tgtId: 10d84abe00000002, state: 0x1, type: SECONDARY] primaryTgtGenNum: 121 mdmTgtConnectionGenNum: 7311 tgtCombCmdGenNum: 1 
01/12 12:21:31.590407 0x7f24a0ae8eb0:mdmTgtMsg_SendAsyncStartMigrate:04605: TgtId: 10d84abe00000002 CombId: 7be4000081e9 MigrateTo:10d871cb00000000 primaryTgtGenNum: 121 tgtCombCmdGenNum: 461 mdmTgtConnectionGenNum: 7346 migrateNum: 246 isFwdRebuild: 1 
01/12 12:21:31.590552 0x7f24a0ae8eb0:multiHeadRow_MoveState_Inner:02966: [multiHead_HandleMigrate:892]: MultiHead: f7c80001 Row: 489 DEGRADED->DEGRADED (INITIATE_MIGRATE) 
...
01/12 12:21:31.592950 0x7f24a0833eb0:mdmTgtMsg_SendAsyncAddSingleCombEX:04000: TgtId: 10d8bfeb00000004 CombId: 7be38000034a CombState: SECONDARY raid: [tgtId: 10d84abe00000002, state: 0x1, type: SECONDARY] primaryTgtGenNum: 128 mdmTgtConnectionGenNum: 4958 tgtCombCmdGenNum: 1 
01/12 12:21:31.592958 0x7f24a0833eb0:mdmTgtMsg_SendAsyncAbortMigrate:04674: TgtId: 10d84abe00000002 CombId: 7be3800001b8 primaryTgtGenNum: 70 tgtCombCmdGenNum: 592 mdmTgtConnectionGenNum: 7346 
01/12 12:21:31.592971 0x7f24a0833eb0:mdmTgtMsg_SendAsyncAbortMigrate:04674: TgtId: 10d84abe00000002 CombId: 7be3800000eb primaryTgtGenNum: 152 tgtCombCmdGenNum: 623 mdmTgtConnectionGenNum: 7346 
01/12 12:21:31.593121 0x7f24a0ae8eb0:mdmTgtMsg_SendAsyncFreeComb:04408: TgtId: 10d871cb00000000 CombId: 7be3800001b8 mdmTgtConnectionGenNum: 7311 
01/12 12:21:31.593138 0x7f24a0ae8eb0:mdmTgtMsg_SendAsyncFreeComb:04408: TgtId: 10d898de00000001 CombId: 7be3800000eb mdmTgtConnectionGenNum: 7321 

Cmatrix 输出：

（信息）请注意，重建已停止，因此看起来它卡在 UI 中，如下所示。

Policy=REBUILD_STOPPED， issue=MULTIPLE， coolingOff=FALSE， bypass=FALSE

-------------------------------------------------------------------------- 

cmatrix status dump (FdID=8ba78f9f00000000, 01/12 11:00:54.998786) 
        policy=REBUILD_STOPPED, issue=MULTIPLE, coolingOff=FALSE, bypass=FALSE 
        nMaxRows=032, nActiveRows=005, nKnownTgts=005 
        matrixGen=495, nCycles=2377, duration [ms]: average<1, max=0 
        matrix memory foot-print is 17344 [bytes] 
row/ column ownership: 
        i=000 :: tgtId=10d871cb00000000 (fsId=10d871cb00000000) 
        i=001 :: tgtId=10d898de00000001 (fsId=10d898de00000001) 
        i=002 :: tgtId=10d84abe00000002 (fsId=10d84abe00000002) 
        i=003 :: tgtId=10d898ee00000003 (fsId=10d898ee00000003) 
        i=004 :: tgtId=10d8bfeb00000004 (fsId=10d8bfeb00000004) 
cells: 
        I+D++ 
        +I+++ 
        +DI++ 
        +++I+ 
        ++++I

冲击
MDM 群集未同步，在此状态下无法进行 MDM 切换。

反复断开连接会导致可维护性中断。

重建卡住，系统处于潜在的单点故障 DU 状态。

SDC 上可能会出现 IO 错误。

Cause

当主 MDM 必须更改数据块的状态时，它必须将这些状态更改写入 MDM 存储库文件，然后将这些更改同步到从属 MDM。这些写入作完成后，MDM 通知 SDS 更改已完成，它们可以继续仅从主拷贝向 SDC 写入 IO（直到重建完成）。

一旦主 MDM 无法更新辅助 MDM，就会导致 MDM 无法足够快地响应 SDS 请求，并可能导致 SDC 上出现 IO 错误。

由于群集成员之间缺乏同步，无法进行 MDM 切换，并且问题似乎出在主 MDM 上，因此必须将另一个 MDM 添加到系统中，位于不存在连接问题的其他位置，并将其替换为其中一个辅助 MDM，然后切换到它。 以这种方式将有问题的主 MDM 踢出群集。

Resolution

解决方法

在 SVM 环境中，如果 GW 虚拟机不驻留在 ESXi 服务器的本地驱动器上，则可以将其用于安装新 MDM 以进行切换的作，并且可以通过 vMotion 迁移到没有问题的其他 ESXi，或者通过此解决方法在任何虚拟机上安装 MDM。

在非 SVM 环境中，虚拟机或非 MDM 节点可用于安装作，并为切换使用新 MDM。

受影响的版本

不适用，网络问题

已修复问题的版本

N/A

Affected Products

PowerFlex Software, VxFlex Product Family, VxFlex Ready Node, Ready Node Series
Article Properties
Article Number: 000203059
Article Type: Solution
Last Modified: 19 Feb 2025
Version:  4
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