Unable to access shared Iscsi datastore from Esxi Host
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Unable to access shared Iscsi datastore from Esxi Host

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Article ID: 400677

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Updated On:

Products

VMware vSphere ESXi

Issue/Introduction

Symptoms : 

  • Upon navigating to the affected ESXi host, the datastore appears as Inaccessible in the vSphere client.

  • Performing a storage rescan does not help in rediscovering the missing datastore.

  • Running the following command does not display details for the affected datastore:

    esxcli storage core device list -d naa id 

  • vmkernel.log reports connection failure

    YYYY-MM-DD In(14) vobd[2097956]:  [iscsiCorrelator] 2712397091694us: [vob.iscsi.discovery.connect.error] discovery failure on vmhba64 to ##.##.##.## because of a network connection failure.
    YYYY-MM-DD In(14) vobd[2097956]:  [iscsiCorrelator] 2712464898112us: [esx.problem.storage.iscsi.discovery.connect.error] iSCSI discovery to on vmhba64 failed. The iSCSI Initiator could not establish a network connection to the discovery address.

Environment

VMware vSphere ESXi (All version)

Cause

The iSCSI targets are not reachable through the port-bound VMKs configured on a different subnet (e.g., 10.##.##.10). However, the targets are accessible via VMKs that are on the same subnet as the storage targets (e.g., 10.##.##.20)."

Cause validation:

  • Ping from port bounded VMKs to target iscsi server will fail with 100% packet loss.

    vmkping -I vmkx -d -s  1472 <IP address of target datastore>"
    PING ##.##.###.## (##.##.###.##): 1472 data bytes

    ---  ##.##.###.## ping statistics ---
    3 packets transmitted, 0 packets received, 100% packet loss

  • In var/run/log/syslog.log file, similar entries are seen:

    2025-06-10T09:53:42.391Z iscsid[2098197]: session login failed with error 4,retryCount=0
    2025-06-10T09:53:42.391Z iscsid[2098197]: Login Target Failed:  iqn.####-##.com.synology:######-###.Target-1.########### if=iscsi_vmk@vmk4 addr=##.#.#.###:3260 (TPGT:1 ISID:0x1) err=4
    2025-06-10T09:53:42.391Z iscsid[2098197]: Login Failed: iqn.####-##.com.#####:######-###.Target-1.########### if=iscsi_vmk@vmk4 addr=##.#.#.###:3260 (TPGT:1 ISID:0x1) Reason: 00040000 Initiator Error: (0x0004 Connection failure.)
    2025-06-10T09:53:42.391Z iscsid[2098197]: Login Target: iqn.####-##.com.#####:######--###.Target-1.###########if=iscsi_vmk@vmk3 addr=##.#.#.###:3260 (TPGT:1 ISID:0x2)
    2025-06-10T09:53:42.392Z iscsid[2098197]: Notice: Assigned (H64 T0 C0 session=82, target=1/1)
    2025-06-10T09:53:42.392Z iscsid[2098197]: cannot make a connection to ##.#.#.###:3260 (101,Network is unreachable)
    2025-06-10T09:53:42.392Z iscsid[2098197]: Notice: Reclaimed Channel (H64 T0 C0 oid=1)
    2025-06-10T09:53:42.392Z iscsid[2098197]: Notice: Reclaimed Target (H64 T0 oid=1)
    2025-06-10T09:53:42.392Z iscsid[2098197]: session login failed with error 4,retryCount=0
    2025-06-10T09:53:42.392Z iscsid[2098197]: Login Target Failed:  iqn.####-##.com.synology:######-###.Target-1.###########if=iscsi_vmk@vmk3 addr=##.#.#.###:3260 (TPGT:1 ISID:0x2) err=4
    2025-06-10T09:53:42.392Z iscsid[2098197]: Login Failed: iqn.####-##.com.######:######--###.Target-1.###########if=iscsi_vmk@vmk3 addr=##.#.#.###:3260 (TPGT:1 ISID:0x2) Reason: 00040000 Initiator Error: (0x0004 Connection failure.)
    2025-06-10T09:53:42.395Z iscsid[2098197]: Login Target: iqn.2015-11.com.hpe:storage.########.########### if=iscsi_vmk@vmk4 addr=##.#.#.###:3260 (TPGT:1 ISID:0x1)
    2025-06-10T09:53:42.395Z iscsid[2098197]: Notice: Assigned (H64 T1 C0 session=83, target=2/2)
    2025-06-10T09:53:42.395Z iscsid[2098197]: cannot make a connection to ###.#.#.10:3260 (112,Host is down)

    2025-06-10T08:20:49.893Z iscsid[2098197]: Notice: Reclaimed Channel (H64 T1 C0 oid=3)
    2025-06-10T08:20:49.893Z iscsid[2098197]: Notice: Reclaimed Target (H64 T1 oid=3)
    2025-06-10T08:20:49.893Z iscsid[2098197]: session login failed with error 4,retryCount=0
    2025-06-10T08:20:49.893Z iscsid[2098197]: Login Target Failed: iqn.####-##.com.######--###.Target-11.############ if=iscsi_vmk@vmk4 addr=##.#.#.###:3260(TPGT:65536 ISID:0x1) err=4
    2025-06-10T08:20:49.893Z iscsid[2098197]: Login Failed: iqn.####-##.com.######:######--###.Target-11.########### if=iscsi_vmk@vmk4 addr=##.#.#.###:3260 (TPGT:65536 ISID:0x1) Reason: 00040000 Initiator Error: (0x0004 Connection failure.)
    2025-06-10T08:20:49.893Z iscsid[2098197]: Login Target: iqn.####-##.com.:######--###.Target-11.########### if=iscsi_vmk@vmk3 addr=##.#.#.###:3260 (TPGT:65536 ISID:0x2)

 

Resolution

 

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