OLVM : ISCSI based Storage Domain Running on fewer paths than customer expected (Doc ID 2879089.1)

Last updated on JULY 27, 2023

Applies to:

Symptoms

On an OLVM 4.3 environment with iSCSI as the storage solution.

All data domains/storage domains are connected via iSCSI on 'N' number of paths.
However, unexpectedly the data domain on the KVM host shows 'X' number of paths (X is fewer than N paths) (which can be made redundant but not on a permanent basis).

It is (temporally) possible to login to the missing target via the OLVM manager (-> Manage domain -> Discover targets -> Login -> Save (OK)), but after a reboot of the compute node the storage domain is active on one path again.)
Removing the compute node from the cluster and adding it again, won’t help, still one path for that domain.

Also noticeable, when the compute node is put in maintenance, it log off from all iSCSI targets (this is normal behaviour), however, it does not log off from the target which was added with (-> Manage domain -> Discover targets -> Login -> Save (OK)).

The computenode has the following iSCSI sessions:
[root@KVMcn01 ~]# iscsiadm -m session
tcp: [1] 192.168.52.151:3260,1 iqn.2020-12.com.atos.xyz:stage:olvm-stage1 (non-flash)
tcp: [2] 192.168.51.151:3260,1 iqn.2020-12.com.atos.xyz:stage:olvm-stage1 (non-flash)
tcp: [3] 192.168.51.151:3260,1 iqn.2020-12.com.atos.xyz:stage:abc-std-01 (non-flash)
tcp: [4] 192.168.52.151:3260,1 iqn.2020-12.com.atos.xyz:stage:abc-std-01 (non-flash)

[Note: the last session (tcp: [4]) is the missing path which was added via (-> Manage domain -> Discover targets -> Login -> Save (OK)) and won’t stay permanent] (Here the issue was with a single path missing)

Changes

 No changes were made in this case

Cause

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