Hello, and welcome back to the last part of . In this part, let’s run some tests on our multipath disks. our article Testing the multipath disks --check the multipath disks
root@has03:/ $> multipath -ll
mpdata1 (36589cfc000000580ddee277e9cda411e) dm-2 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:2 sdf 8:80  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:2 sdi 8:128 active ready running
mpfra1 (36589cfc000000f5feabc996aa1a12876) dm-3 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:3 sdg 8:96  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:3 sdj 8:144 active ready running
mpdata2 (36589cfc00000025b4072a1536ade2f9d) dm-4 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:1 sde 8:64  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:1 sdh 8:112 active ready running

--shutdown the device enp0s8  
root@has03:/ $> nmcli con down enp0s8
Connection 'enp0s8' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/4)

--check the disks, now we have a "failed faulty" path
root@has03:/ $> multipath -ll
mpdata1 (36589cfc000000580ddee277e9cda411e) dm-2 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=0 status=enabled
| `- 7:0:0:2 sdf 8:80  failed faulty running
`-+- policy='service-time 0' prio=50 status=active
  `- 8:0:0:2 sdi 8:128 active ready running
mpfra1 (36589cfc000000f5feabc996aa1a12876) dm-3 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=0 status=enabled
| `- 7:0:0:3 sdg 8:96  failed faulty running
`-+- policy='service-time 0' prio=50 status=active
  `- 8:0:0:3 sdj 8:144 active ready running
mpdata2 (36589cfc00000025b4072a1536ade2f9d) dm-4 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=0 status=enabled
| `- 7:0:0:1 sde 8:64  failed faulty running
`-+- policy='service-time 0' prio=50 status=active
  `- 8:0:0:1 sdh 8:112 active ready running

--the ASM disks still exist
root@has03:/ $> ll /dev/oracleasm/mp*
lrwxrwxrwx. 1 root root 7 Apr 30 11:53 /dev/oracleasm/mpdata1 -> ../dm-2
lrwxrwxrwx. 1 root root 7 Apr 30 11:53 /dev/oracleasm/mpdata2 -> ../dm-4
lrwxrwxrwx. 1 root root 7 Apr 30 11:53 /dev/oracleasm/mpfra1 -> ../dm-3

--the Oracle Restart is still up and running
root@has03:/ $> crsctl status res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
               ONLINE  ONLINE       has03                    STABLE
ora.FRA.dg
               ONLINE  ONLINE       has03                    STABLE
ora.LISTENER.lsnr
               ONLINE  ONLINE       has03                    STABLE
ora.asm
               ONLINE  ONLINE       has03                    Started,STABLE
ora.ons
               OFFLINE OFFLINE      has03                    STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.cssd
      1        ONLINE  ONLINE       has03                    STABLE
ora.diskmon
      1        OFFLINE OFFLINE                               STABLE
ora.evmd
      1        ONLINE  ONLINE       has03                    STABLE
ora.money.db
      1        ONLINE  ONLINE       has03                    Open,HOME=/u01/app/o
                                                             racle/product/19c/db
                                                             home_1,STABLE
-------------------------------------------------------------------------------- So, our multipath seems to work fine. Let’s try to shut down the other interface. --startup the device enp0s8  
root@has03:/ $> nmcli con up enp0s8
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/6)

--check the multipath disks
--no more faulty paths
root@has03:/ $> multipath -ll
mpdata1 (36589cfc000000580ddee277e9cda411e) dm-2 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:2 sdf 8:80  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:2 sdi 8:128 active ready running
mpfra1 (36589cfc000000f5feabc996aa1a12876) dm-3 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:3 sdg 8:96  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:3 sdj 8:144 active ready running
mpdata2 (36589cfc00000025b4072a1536ade2f9d) dm-4 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:1 sde 8:64  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:1 sdh 8:112 active ready running

--shutdown the device enp0s9
root@has03:/ $> nmcli con down enp0s9
Connection 'enp0s9' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/5)

--check the multipath disks
--now, the other path is faulty, as expected
root@has03:/ $> multipath -ll
mpdata1 (36589cfc000000580ddee277e9cda411e) dm-2 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:2 sdf 8:80  active ready running
`-+- policy='service-time 0' prio=0 status=enabled
  `- 8:0:0:2 sdi 8:128 failed faulty running
mpfra1 (36589cfc000000f5feabc996aa1a12876) dm-3 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:3 sdg 8:96  active ready running
`-+- policy='service-time 0' prio=0 status=enabled
  `- 8:0:0:3 sdj 8:144 failed faulty running
mpdata2 (36589cfc00000025b4072a1536ade2f9d) dm-4 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:1 sde 8:64  active ready running
`-+- policy='service-time 0' prio=0 status=enabled
  `- 8:0:0:1 sdh 8:112 failed faulty running

--our has still working like a charm
root@has03:/ $> crsctl status res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
               ONLINE  ONLINE       has03                    STABLE
ora.FRA.dg
               ONLINE  ONLINE       has03                    STABLE
ora.LISTENER.lsnr
               ONLINE  ONLINE       has03                    STABLE
ora.asm
               ONLINE  ONLINE       has03                    Started,STABLE
ora.ons
               OFFLINE OFFLINE      has03                    STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.cssd
      1        ONLINE  ONLINE       has03                    STABLE
ora.diskmon
      1        OFFLINE OFFLINE                               STABLE
ora.evmd
      1        ONLINE  ONLINE       has03                    STABLE
ora.money.db
      1        ONLINE  ONLINE       has03                    Open,HOME=/u01/app/o
                                                             racle/product/19c/db
                                                             home_1,STABLE
-------------------------------------------------------------------------------- Now, let’s go crazy, and shutdown both interfaces. root@has03:/ $> nmcli con down enp0s8
Connection 'enp0s8' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/6)

root@has03:/ $> nmcli d
DEVICE  TYPE      STATE         CONNECTION
enp0s3  ethernet  connected     enp0s3
enp0s8  ethernet  disconnected  --
enp0s9  ethernet  disconnected  --
lo      loopback  unmanaged     --

--no miracle here, both paths are faulty
root@has03:/ $> multipath -ll
mpdata1 (36589cfc000000580ddee277e9cda411e) dm-2 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=0 status=enabled
| `- 7:0:0:2 sdf 8:80  failed faulty running
`-+- policy='service-time 0' prio=0 status=enabled
  `- 8:0:0:2 sdi 8:128 failed faulty running
mpfra1 (36589cfc000000f5feabc996aa1a12876) dm-3 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=0 status=enabled
| `- 7:0:0:3 sdg 8:96  failed faulty running
`-+- policy='service-time 0' prio=0 status=enabled
  `- 8:0:0:3 sdj 8:144 failed faulty running
mpdata2 (36589cfc00000025b4072a1536ade2f9d) dm-4 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=0 status=enabled
| `- 7:0:0:1 sde 8:64  failed faulty running
`-+- policy='service-time 0' prio=0 status=enabled
  `- 8:0:0:1 sdh 8:112 failed faulty running
root@has03:/ $>

--the disks are still present
root@has03:/ $> ll /dev/oracleasm/mp*
lrwxrwxrwx. 1 root root 7 Apr 30 12:00 /dev/oracleasm/mpdata1 -> ../dm-2
lrwxrwxrwx. 1 root root 7 Apr 30 12:00 /dev/oracleasm/mpdata2 -> ../dm-4
lrwxrwxrwx. 1 root root 7 Apr 30 12:00 /dev/oracleasm/mpfra1 -> ../dm-3

--but the diskgroups and the database "died", as expected
root@has03:/ $> crsctl status res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
               ONLINE  OFFLINE      has03                    STABLE
ora.FRA.dg
               ONLINE  OFFLINE      has03                    STABLE
ora.LISTENER.lsnr
               ONLINE  ONLINE       has03                    STABLE
ora.asm
               ONLINE  ONLINE       has03                    Started,STABLE
ora.ons
               OFFLINE OFFLINE      has03                    STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.cssd
      1        ONLINE  ONLINE       has03                    STABLE
ora.diskmon
      1        OFFLINE OFFLINE                               STABLE
ora.evmd
      1        ONLINE  ONLINE       has03                    STABLE
ora.money.db
      1        ONLINE  OFFLINE                               Instance Shutdown,ST
                                                             ABLE
-------------------------------------------------------------------------------- Now, let’s clean up the mess. --let's bring the interfaces back online
root@has03:/ $> nmcli con up enp0s8
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/7)

root@has03:/ $> nmcli con up enp0s9
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/8)

--the disks are happy again
root@has03:/ $> multipath -ll
mpdata1 (36589cfc000000580ddee277e9cda411e) dm-2 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:2 sdf 8:80  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:2 sdi 8:128 active ready running
mpfra1 (36589cfc000000f5feabc996aa1a12876) dm-3 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:3 sdg 8:96  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:3 sdj 8:144 active ready running
mpdata2 (36589cfc00000025b4072a1536ade2f9d) dm-4 TrueNAS,iSCSI Disk
size=5.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 7:0:0:1 sde 8:64  active ready running
`-+- policy='service-time 0' prio=50 status=enabled
  `- 8:0:0:1 sdh 8:112 active ready running
  
--since the Oracle Restart is not going to mount the disks automatically, let's give him a hand
grid@has03:[GRID]:/home/grid $> crsctl stop has -f
CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'has03'
CRS-2673: Attempting to stop 'ora.LISTENER.lsnr' on 'has03'
CRS-2673: Attempting to stop 'ora.evmd' on 'has03'
CRS-2673: Attempting to stop 'ora.asm' on 'has03'
CRS-2677: Stop of 'ora.LISTENER.lsnr' on 'has03' succeeded
CRS-2677: Stop of 'ora.evmd' on 'has03' succeeded
CRS-2677: Stop of 'ora.asm' on 'has03' succeeded
CRS-2673: Attempting to stop 'ora.cssd' on 'has03'
CRS-2677: Stop of 'ora.cssd' on 'has03' succeeded
CRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'has03' has completed
CRS-4133: Oracle High Availability Services has been stopped.

grid@has03:[GRID]:/home/grid $> crsctl start has
CRS-4123: Oracle High Availability Services has been started.

--It's AAAALLLLLIVEEEEE!!!
grid@has03:[GRID]:/home/grid $> crsctl status res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
               ONLINE  ONLINE       has03                    STABLE
ora.FRA.dg
               ONLINE  ONLINE       has03                    STABLE
ora.LISTENER.lsnr
               ONLINE  ONLINE       has03                    STABLE
ora.asm
               ONLINE  ONLINE       has03                    Started,STABLE
ora.ons
               OFFLINE OFFLINE      has03                    STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.cssd
      1        ONLINE  ONLINE       has03                    STABLE
ora.diskmon
      1        OFFLINE OFFLINE                               STABLE
ora.evmd
      1        ONLINE  ONLINE       has03                    STABLE
ora.money.db
      1        ONLINE  ONLINE       has03                    Open,HOME=/u01/app/o
                                                             racle/product/19c/db
                                                             home_1,STABLE
-------------------------------------------------------------------------------- C’est fini mes amis. In this article, I hope I have shown you how to create a homemade environment to implement and test multipath disks. À la prochaine.

Walkthroughs, tutorials, guides, and tips. This story will teach you how to do something new or how to do something better.

The code in this story is for educational purposes. The readers are solely responsible for whatever they build with it.

Playing With Oracle ASM and Multipath Disks — Benchmarking Your Performance

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