[RFE] Support remote iSCSI shares as root devices via iscsistart

[Yossi Ovadia]

In case of diskless hardware with remove iscsi devices , introspection fails with 'missing local_gb' and exited.

I found out that it is required to execute iscsistart -b on the servers to connect to the iscsi target and then for the 'disks' device to appear.

parted -l before issuing iscsistart return nothing.

issuing the command :
[root@localhost ~]# iscsistart -b
iscsistart: Can not bind IPC socket
iscsistart: Could not setup mgmt ipc
iscsistart: Logging into iqn.1992-04.com.emc:cx.ckm00153300462.a4 172.30.53.10:3260,1

And parted -l now shows all disks.

I have verified that introspection succeeded when i've added utils.execute('iscsistart', '-f') just before _udev_settle ( hardware.py )

Sample inspector_data after the above :
..
"root_disk": {
        "model": "RAID 0",
        "name": "/dev/sdc",
        "rotational": true,
        "serial": "6006016007903d00781cbd7de7f0e511",
        "size": 42192470016,
        "vendor": "DGC",
        "wwn": "0x6006016007903d00",
        "wwn_vendor_extension": "0x781cbd7de7f0e511",
        "wwn_with_extension": "0x6006016007903d00781cbd7de7f0e511"
    }

Sample iscsistart -f
[root@localhost ~]# iscsistart -f
# BEGIN RECORD 6.2.0.873-30
iface.initiatorname = iqn.1990-07.com.emulex:blade04
iface.transport_name = be2iscsi
iface.hwaddress = fc:15:b4:0b:1e:71
iface.bootproto = STATIC
node.name = iqn.1992-04.com.emc:cx.ckm00153300462.a4
node.conn[0].address = 172.30.53.10
node.conn[0].port = 3260
# END RECORD
[root@localhost ~]# echo $?
0

PS -
I have tried to add - iscsi_firmware &| rd.iscsi.firmware=1 to boot kernel and it did not changed the behavioural.

[Dmitry Tantsur (divius)]

Hi, thanks for your report! Do I get it right that you need both iscsistart -b and iscsistart -f for it to work?

[Yossi Ovadia (jabadia)]

Hi,
iscsistart -f will 'Print the iBFT or OF info to STDOUT' ( from man page )

and iscsistart -b will 'Create a session to the target using the iBFT or OF info'

So what I had in mind is to use iscsistart -f and only if it show existing iscsi connection, issue the -b command.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/327807

[Yossi Ovadia (jabadia)]

Hi Jay, Already started working on this one.
Thanks.

[Jay Faulkner (jason-oldos)]

https://review.openstack.org/327891 had the wrong bug number in it, this is why it keeps being reassigned to me. Apologies.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/327807
Committed: https://git.openstack.org/cgit/openstack/ironic-python-agent/commit/?id=90424fad0af9cda1c14bd5d4a7c0f397705c1751
Submitter: Jenkins
Branch: master

commit 90424fad0af9cda1c14bd5d4a7c0f397705c1751
Author: Yossi Ovadia <email address hidden>
Date: Thu Jun 9 09:23:29 2016 -0700

    Handle diskless hardware connected to remote iscsi

    It is required to issue iscsistart -b on those hardware in order for
    /dev/sda /dev/sdb etc to be exposed to the OS.

    On this type of hw, without the fix
    introspection fails with - missing: ['local_gb']' err.

    Change-Id: If6667b123e9b890d97c03612596fb78ee2b0ae85
    Closes-Bug: 1590606

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/ironic-python-agent 1.5.0 release.