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--- public:iscsi:basics [2019/02/06 08:00] – clarified content wiki.tk
+++ public:iscsi:basics [2019/02/06 08:05] (current) – updated content wiki.tk
@@ Line 1: / Line 1: @@
+===== iSCSI basics =====
+In the world of iSCSI the following terms apply:
+  * the iSCSI server is called 'iSCSI target'
+  * the iSCSI client is called 'iSCSI initiator'.\\
+To keep this wiki compatible to other guides the terms 'target' and 'initiator' are used as described above.
+__Warning:__\\
+Kernels before the version 3.2.0-38 include a bug with respect to iSCSI: As long as other technologies (e.g. LVM, multipath) still access iSCSI devices, every trial to log out of an iSCSI device leads to a non-recoverable kernel trace error. Only a restart of the host can recover from this error.
+Even a restart or an update of the software package 'open-iscsi' can initiate such a log-out and thus lead to a kernel trace error. Data loss can be the result.
+As a conclusion iSCSI must not be used on productive KVM hosts using a kernel version prior to version 3.2.0-38. All current Linux distributions meanwhile use more recent kernel versions.
+The running kernel version can be found e.g. with ''uname'':
+  root@kvm55:~# uname -r
+.2.0-43-generic
+[[public:iscsi|previous chapter]] | [[public:start|contents]] | [[public:iscsi:login|next chapter]]