xebech wrote:
Hello,
I am a new user of open-iscsi. I use iscsi to create diskless cluster.
I have a problem when I halt my nodes, I can not disconnect properly
my iscsi session from nodes because they need to access to their root
FS.
Do you know a method to properly halt diskless nodes ?
Hi Antoine,
If you log in to a target in the initrd and mount your root filesystem over a
LUN then you need to make sure that iscsid does not log out of that LUN when it
is killed on shutdown. You can ensure this by changing the node.startup value
in /etc/iscsi/nodes/<iqn>/default. Here's how:
iscsiadm -m node -T <iqn> -o update -n node.startup -v onboot
Note that the node may not be present in /etc/iscsi/nodes as you logged in from
the initrd using iscsistart and not from the root filesystem using iscsiadm. If
this is the case then iscsid will not log out when it is killed. However, you
shouldn't rely on this since it is possible for "iscsiadm -m discovery" to
create the node between booting and shutting down. And if it does it will
assign the value "manual" to node.startup by default, causing iscsid to log out
on shutdown.
Another problem you may have is that the interface used to access your LUN is
brought down by "service network stop". On RHEL you can stop this happening by
ensuring that /etc/sysconfig/network-scripts/ifcfg-<interface> does not exist.
There is no point having a configuration for this interface in your root
filesystem anyway, since your initrd MUST bring up the interface and configure
it to access the root disk, and ANY change to its configuration after the root
filesystem is mounted could make your system hang.
Regards,
Alex
Thanks a lot.
--
Antoine Castaing
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