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ISER(4) FreeBSD Kernel Interfaces Manual ISER(4)
NAME
iser - iSCSI Extensions for RDMA (iSER) driver
SYNOPSIS
To compile this driver into the kernel, place the following line in the
kernel configuration file:
device iser
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
iser_load="YES"
DESCRIPTION
The iser (iSCSI Extensions for RDMA) initiator driver extends the iSCSI
protocol to RDMA. It permits data to be transferred directly into and
out of SCSI buffers without intermediate data copies. iSER uses the RDMA
protocol suite to supply higher bandwidth for block storage transfers
(zero copy behavior). To that fact, it eliminates the TCP/IP processing
overhead while preserving the compatibility with iSCSI protocol. The
initiator is the iSCSI/iSER client, which connects to an iSCSI/iSER
target, providing local access to a remote block device. The userland
component is provided by iscsid(8) and both the kernel and userland are
configured using iscsictl(8).
SYSCTL VARIABLES
The following variables are available as both sysctl(8) variables and
loader(8) tunables:
kern.iser.debug
Verbosity level for log messages from the iser driver. Set to 0
to disable logging or 1 to warn about potential problems. Larger
values enable info and debugging output. Defaults to 0.
SEE ALSO
iscsi(4), iscsi.conf(5), iscsictl(8), iscsid(8)
HISTORY
The iser subsystem first appeared in FreeBSD 11.0.
AUTHORS
The iser subsystem was developed by Max Gurtovoy <maxg@mellanox.com> and
Sagi Grimberg <sagig@mellanox.com> under sponsorship from Mellanox
Technologies.
FreeBSD 14.2-RELEASE June 6, 2016 FreeBSD 14.2-RELEASE