table of contents
ISCSI(4) | Device Drivers Manual | ISCSI(4) |
NAME¶
iscsi
— iSCSI
initiator
SYNOPSIS¶
To compile this driver into the kernel, place the following line in the kernel configuration file:
device iscsi
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
iscsi_load="YES"
DESCRIPTION¶
The iscsi
subsystem provides the kernel
component of an iSCSI initiator, responsible for implementing the Full
Feature Phase of the iSCSI protocol. The initiator is the iSCSI client,
which connects to an iSCSI 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.iscsi.debug
- Verbosity level for log messages from the
iscsi
driver. Set to 0 to disable logging or 1 to warn about potential problems. Larger values enable debugging output. Defaults to 1. - kern.iscsi.ping_timeout
- The number of seconds to wait for the target to respond to a NOP-Out PDU. In the event that there is no response within that time the session gets forcibly restarted. Set to 0 to disable sending NOP-Out PDUs. Defaults to 5.
- kern.iscsi.iscsid_timeout
- The number of seconds to wait for iscsid(8) to establish
a session. After that time
iscsi
will abort and retry. Defaults to 60. - kern.iscsi.login_timeout
- The number of seconds to wait for a login attempt to succeed. After that
time
iscsi
will abort and retry. Defaults to 60. - The maximum number of outstanding IO requests. Defaults to 255.
- kern.iscsi.fail_on_disconnection
- Controls the behavior after an iSCSI connection has been dropped due to network problems. When set to 1, a dropped connection causes the iSCSI device nodes to be destroyed. After reconnecting, they will be created again. By default, the device nodes are left intact. While the connection is down all input/output operations are suspended, to be retried after the connection is reestablished.
SEE ALSO¶
HISTORY¶
The iscsi
subsystem first appeared in
FreeBSD 10.0.
AUTHORS¶
The iscsi
subsystem was developed by
Edward Tomasz Napierala
<trasz@FreeBSD.org>
under sponsorship from the FreeBSD Foundation.
May 28, 2017 | Debian |