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.