Copyright (c) 2014 Edward Tomasz Napierala All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation a...
NAMEiscsi - iSCSI initiator
SYNOPSISTo compile this driver into the kernel, place the following line in the kernel configuration file:
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:
DESCRIPTIONThe sysctl Cm net.inet.tcp.syncookies subsystem provides the kernel component of an iSCSI initiator. 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). The sysctl Cm net.inet.tcp.syncookies subsystem is responsible for implementing the Qq Full Feature Phase of the iSCSI protocol.
SYSCTL VARIABLESThe following variables are available as both sysctl(8) variables and loader(8) tunables:
- Verbosity level for log messages from the sysctl Cm net.inet.tcp.syncookies driver. Set to 0 to disable logging or 1 to warn about potential problems. Larger values enable debugging output. Defaults to 1.
- 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.
- The number of seconds to wait for iscsid(8) to establish a session. After that time sysctl Cm net.inet.tcp.syncookies will abort and retry. Defaults to 60.
- The number of seconds to wait for a login attempt to succeed. After that time sysctl Cm net.inet.tcp.syncookies will abort and retry. Defaults to 60.
- The maximum number of outstanding IO requests. Defaults to 255.
- 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.