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 iserAlternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
iser_load="YES"
DESCRIPTION
Theiser (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
iserdriver. 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
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.