Title: OpenBSD and iSCSI part2: the initiator (client)

	Title: OpenBSD and iSCSI part2: the initiator (client)
	Author: Solène
	Date: 21 February 2019
	Tags: unix openbsd iscsi
	Description:

	This is the second article of the serie about iSCSI. In this one, you
	will
	learn how to connect to an iSCSI target using OpenBSD base daemon
	iscsid.

	The configuration file of iscsid doesn't exist by default, its
	location is
	/etc/iscsi.conf. It can be easily written using the following:

	target1="100.64.2.3"
	myaddress="100.64.2.2"

	target "disk1" {
	initiatoraddr $myaddress
	targetaddr $target1
	targetname "iqn.1994-04.org.netbsd.iscsi-target:target0"
	}

	While most lines are really obvious, it is mandatory to have the
	line
	initiatoraddr, many thanks to cwen@ for pointing this out when I was
	stuck on
	it.

	The targetname value will depend of the iSCSI target server. If you use
	netbsd-iscsi-target, then you only need to care about the last part,
	aka
	target0 and replace it by the name of your target (which is target0
	for the
	default one).

	Then we can enable the daemon and start it:

	# rcctl enable iscsid
	# rcctl start iscsid

	In your dmesg, you should see a line like:

	sd4 at scsibus0 targ 1 lun 0: <NetBSD, NetBSD iSCSI, 0> SCSI3
	0/direct fixed t10.NetBSD_0x5c6cf1b69fc3b38a

	If you use netbsd-iscsi-target, the whole line should be identic except
	for the
	sd4 part which can change, depending of your hardware.

	If you don't see it, you may need to reload iscsid configuration file
	with
	`iscsictl reload`.

	Warning: iSCSI is a bit of pain to debug, if it doesn't work, double
	check the
	IPs in /etc/iscsi.conf, check your PF rules on the initiator and
	the
	target. You should be at least able to telnet into the target IP port
	3260.

	Once you found your new sd device, you can format it and mount it as a
	regular
	disk device:

	# newfs /dev/rsd4c
	# mount /dev/sd4c /mnt

	iSCSI is far mor efficient and faster than NFS but it has a total
	different
	purpose. I'm using it on my powerpc machines to build packages on it.
	This
	reduce their old IDE disks usage while giving better response time and
	equivalent speed.