PowerFlex-omskiftning mislykkedes, når MDM ikke var synkroniseret

Summary: Problemer med netværksforbindelsen medfører, at status for sekundær MDM/s bliver Ikke synkroniseret.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
Check out other resources

Symptoms

Scenario
Konsekvente MDM-afbrydelser og forbindelsesproblemer mellem primær og sekundær MDM/s medfører, at status for sekundær MDM/s ikke synkroniseres.

Symptomer
Mangel på konsistent forbindelse mellem primær og sekundær MDM/s viser følgende symptomer:

Output af scli --query_cluster viser sekundær MDM/s afbrudt.

Output af scli --query_cluster viser sekundær MDM/s Ikke synkroniseret.

Cmatrix viser, at genopbygningen sidder fast.

SDC SDS-forbindelsesproblemer<>(SDS er placeret på en problematisk MDM).

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-hændelser:

(info) Bemærk de mange afbrydelser på MDM'er og SDC'er fra SDS'er, eksempler er nedenfor.

MDM, ID 51ddc23b3cddea90, mistede forbindelsen.
MDM, ID 3bf30e1a42079e61, svarer ikke.
SDC-id: 9503ac9800000003 afbrudt fra IP 192.168.20.2 i SDS parsioesx02.ansys.com-ESX; ID: 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:

(info) Bemærk, at flere kamme går i en forringet tilstand og begynder at genopbygge, eksempler er nedenfor.

Multi-hoved: f7c90002 række: 1022 FORRINGET-NEDBRUDT> (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-output:

(info) Bemærk, at genopbygningen er stoppet, og derfor ser det ud til, at den sidder fast i brugergrænsefladen, for eksempel nedenfor.

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

Indvirkning
MDM-klyngen er ikke synkroniseret, MDM-omskiftning er umulig i denne tilstand.

Gentagne tab af forbindelse forårsager forstyrrelser i servicevenligheden.

Genopbygningen er gået i stå, og systemet er på et potentielt enkelt fejlpunkt for en DU.

IO-fejl kan ses på SDC'erne.

Cause

Når Master MDM skal foretage ændringer i tilstanden for datablokke, skal den skrive disse tilstandsændringer til MDM-arkivet og derefter synkronisere disse ændringer med Slave MDMs. Når disse skrivehandlinger er fuldført, giver MDM SDS erne besked om, at ændringerne er afsluttet, og de kan genoptage visningen for kun at skrive IO'er til SDC'erne fra den primære kopi (indtil genopbygningen er fuldført).

Når den primære MDM ikke er i stand til at opdatere den eller de sekundære MDM'er, medfører det, at MDM ikke kan reagere hurtigt nok på SDS-anmodningerne og kan forårsage IO-fejl på SDC'erne.

Da MDM-omskiftning er umulig på grund af manglende synkronisering mellem klyngemedlemmerne, og problemet ser ud til at være på den primære MDM, skal der føjes en anden MDM til systemet på et andet sted, hvor forbindelsesproblemet ikke eksisterer, og erstatte det med en af de sekundære og derefter skifte over til det, på den måde at sparke den problematiske primære MDM ud af klyngen.

Resolution

Løsning

I et SVM-miljø kan GW VM bruges til installation og ny MDM til omskiftning, hvis den ikke er placeret på det lokale drev på ESXi-serveren, og kan vMotioneres til en anden ESXi, der ikke har problemet ELLER installere en MDM på en VM til denne løsning.

I et ikke-SVM-miljø kan en VM eller en ikke-MDM-node bruges til installation og ny MDM til overgangen.

Påvirkede versioner

Ikke relevant, netværksproblemer

Fast i version

Ikke tilgængelig

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
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.