10–iSCSI Protocol
iSCSI Offload on VMware Server
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List All Sessions
After a login, type the following command to show all sessions:
iscsiadm -m session
The following command shows more detail, such as the device name
(
/dev/sdb
), which can be verified using the
fdisk -l
command.
iscsiadm -m session -P2
List All Drives Active in the System
fdisk -l
Maximum Offload iSCSI Connections
With default driver parameters set, which includes 128 outstanding commands,
bnx2i can offload 128 connections on QLogic 8400 Series adapters:
This is not a hard limit, but just a simple on-chip resource allocation math. bnx2i
will be able to offload more connections by reducing the shared queue size, which
in turn limits the maximum outstanding tasks on a connection. See
for Optional Properties” on page 33
for information on sq_size and rq_size. The
driver logs the following message to syslog when the maximum allowed
connection offload limit is reached - “bnx2i: unable to allocate iSCSI context
resources”.
Linux iSCSI Offload FAQ
QLogic 3400 Series adapters do not support iSCSI offload.
The iSCSI session will not recover after a hot remove and hot plug.
For MPIO to work properly, iSCSI nopout should be enabled on each iSCSI
session. Refer to open-iscsi documentation for procedures on setting up
noop_out_interval
and
noop_out_timeout
values.
In the scenario where multiple CNIC devices are in the system and the
system is booted with QLogic’s iSCSI boot solution, ensure that the iscsi
node under /etc/iscsi/nodes for the boot target is bound to the NIC that is
used for booting.
iSCSI Offload on VMware Server
The bnx2xi driver is the QLogic VMware iSCSI adapter driver supporting iSCSI
offload and jumbo frames up to 9,000 bytes on VMware ESXi 5.
x
and 6.0.
Lossless iSCSI-Offload-TLV over DCB is supported on ESXi 5.
x
and 6.0.
