ISCSI.CONF(5)

NAME
iscsi.conf - key options to be negotiated in an iSCSI session

DESCRIPTION
The file iscsi.conf, is read by the iscontrol(8) program. It contains declarations and parameter/key-options. The syntax is very simple,
    variable = value;
and they can be grouped via a block declaration:

    	# this is a comment
    	target_1 { # nickname
    	   variable = value;
    	   ...
    	} # this must be on a line by itself.

The following are specified in the iSCSI RFC 3720, for a full description see sections 11/12 of the RFC.

AuthMethod
    currently only supported authentication method is CHAP, with digest either MD5 or SHA. Default is none.

HeaderDigest
    a digest is calculated on the header of all iSCSI PDUs, and checked. Only CRC32C is implemented. Default is none.

DataDigest
    same as for HeaderDigest, but on the data part of the iSCSI PDU. (not yet tested)

MaxConnections
    is the number of simultaneous connections per session, currently only 1.

TargetName
    is the name by which the target is known, not to be confused with target address, either obtained via the target administrator, or from a discovery session.

InitiatorName
    if not specified, defaults to iqn.2005-01.il.ac.huji.cs: <hostname>.

TargetAlias / InitiatorAlias
    not implemented.

TargetAddress
    is of the form domainname[:port][,portal-group-tag] to quote the RFC:
    The domainname can be specified as either a DNS host name, a dotted-decimal IPv4 address, or a bracketed IPv6 address as specified in [RFC2732].

    Note: portal-group-tag is unused at the moment.

TargetPortalGroupTag
    not implemented yet.

InitialR2T
    not implemented yet.

ImmediateData
    not implemented yet.

MaxRecvDataSegmentLength
    the maximum data segment length in bytes it can receive in an iSCSI PDU, default is 8192.

MaxBurstLength
    not implemented yet.

FirstBurstLength
    not implemented yet.

DefaultTime2Wait
    not implemented yet.

DefaultTime2Retain
    not implemented yet.

MaxOutstandingR2T
    is used to calculate/negotiate the tag opening, can be overriden by the tag option.

DataPDUInOrder
    not implemented yet.

DataSequenceInOrder
    not implemented yet.

ErrorRecoveryLevel
    Only level 0 is supported.

SessionType
    either Discovery or Normal, default is Normal, see the -d flag of iscontrol.

The following are not specified in the RFC 3720

port
    The iSCSI port used by the iSCSI protocol, defaults to 3260.

tags
    Sets the tag opening to the value specified.

maxluns
    overrides the compiled value of luns, see iscsi_initiator(4). This value can only be reduced.

sockbufsize
    sets the receiver and transmitter socket buffer size to size, in kilobytes. The default is 128.

If AuthMethod is set to CHAP, then the following must also be set:

chapSecret
    this shared-secret. Can be either an ASCII string (e.g. hello world), a hex string (e.g 0xababcd0987654321...), or base64 string (eg 0b...)

chapIName
    the chap-name, defaults to hostname.

chapDigest
    can be MD5 or SHA1.

tgtChapSecret/tgtChapName
    same as the none tgt counterpart, but to authenticate the target.

FILES
/etc/iscsi.conf

EXAMPLES

    #
    # Globals
    #
    port = 3260
    #
    myiscsi { # nickname
       targetaddress	= iscsi1
       targetname		= iqn.1900.com.com:sn.123456
    }
    chaptest {
       targetaddress= 10.0.0.1;
       targetname	= iqn.1900.com.com:sn.123456
       initiatorname= iqn.2005-01.il.ac.huji.cs:nobody
       authmethod = CHAP; chapDigest = SHA1;
       chapsecret = 0x3713c3336d9a224c2791c873d3d2b174
       tags		= 256
    }

ERRORS
The parsing is very primitive, so do not expect - at the moment - any error messages.

SEE ALSO
iscsi_initiator(4), iscontrol(8)

STANDARDS
ISCSI RFC 3720

BUGS
Some options have not been implemented, either they were found to be unnecessary, or not understood, this can change in the future.
The tags opening value is difficult to calculate, use wisely.