[CentOS] Possible to run iscsi-target and initiator on same server?

C Linus Hicks linush at verizon.net
Sat Oct 10 05:29:27 UTC 2009


On Fri, 2009-10-09 at 21:42 -0400, Ross Walker wrote:
> On Oct 9, 2009, at 6:14 PM, C Linus Hicks wrote:
> >
> > So for iet, that means /etc/iet/ietd.conf should define the Lun like
> > this:
> >
> > Lun 0 Path=/dev/sdb,Type=blockio,ScsiId=asmdg,ScsiSN=dg0
> >
> > If that's all it takes to make it do blockio instead of fileio, then
> > that is already the case. Deadlocks on the cache pages - wouldn't that
> > only affect I/O and not logging in?
> 
> Ok, well at least that's covered.
> 
> Is iptables disabled?
> 
> Also the latest version of IET won't advertise the loopback on  
> discovery unless you are discovering on that same same loopback  
> address. You can still statically connect though, which I recommend  
> for loopback connections.

Yep, iptables doesn't run on that machine, the service is disabled. And
I'm just using the one IP address on that machine.

Here's my /var/lib/iscsi/ifaces/iface0 file:

iface.transport_name = tcp
iface.hwaddress = 00:1D:92:B4:50:6E

Is the transport_name for loopback still tcp?
The discovery appears to work properly:

[root at lh6 iscsi]# iscsiadm -m discovery -t st -p 10.200.1.6:3260 -I iface0 -P 1
    Target: iqn.2009-10.net.linush:storage.disk1.sys1.asmdg
        Portal: 10.200.1.6:3260,1
           Iface Name: iface0

I found a way to make the entry in /var/lib/iscsi/static which is just a
symbolic link back to the entry in /var/lib/iscsi/nodes, but you must be
seeing different documentation because I don't see any thing that talks
about logging in using the static entry. At any rate, I run this command
and get the output as shown:

[root at lh6 iscsi]# iscsiadm -m node -T iqn.2009-10.net.linush:storage.disk1.sys1.asmdg -p 10.200.1.6:3260 -l
Logging in to [iface: iface0, target: iqn.2009-10.net.linush:storage.disk1.sys1.asmdg, portal: 10.200.1.6,3260]
iscsiadm: Could not login to [iface: iface0, target: iqn.2009-10.net.linush:storage.disk1.sys1.asmdg, portal: 10.200.1.6,3260]: 
iscsiadm: initiator reported error (8 - connection timed out)

And here's the node:

[root at lh6 iscsi]# cat nodes/iqn.2009-10.net.linush\:storage.disk1.sys1.asmdg/10.200.1.6\,3260\,1/iface0 
# BEGIN RECORD 2.0-868
node.name = iqn.2009-10.net.linush:storage.disk1.sys1.asmdg
node.tpgt = 1
node.startup = manual
iface.hwaddress = 00:1D:92:B4:50:6E
iface.iscsi_ifacename = iface0
iface.net_ifacename = default
iface.transport_name = tcp
node.discovery_port = 0
node.discovery_type = static
node.session.initial_cmdsn = 0
node.session.initial_login_retry_max = 4
node.session.cmds_max = 128
node.session.queue_depth = 32
node.session.auth.authmethod = None
node.session.timeo.replacement_timeout = 120
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 30
node.session.err_timeo.host_reset_timeout = 60
node.session.iscsi.FastAbort = Yes
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.session.iscsi.DefaultTime2Retain = 0
node.session.iscsi.DefaultTime2Wait = 2
node.session.iscsi.MaxConnections = 1
node.session.iscsi.MaxOutstandingR2T = 1
node.session.iscsi.ERL = 0
node.conn[0].address = 10.200.1.6
node.conn[0].port = 3260
node.conn[0].startup = manual
node.conn[0].tcp.window_size = 524288
node.conn[0].tcp.type_of_service = 0
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.auth_timeout = 45
node.conn[0].timeo.noop_out_interval = 5
node.conn[0].timeo.noop_out_timeout = 5
node.conn[0].iscsi.MaxRecvDataSegmentLength = 131072
node.conn[0].iscsi.HeaderDigest = None,CRC32C
node.conn[0].iscsi.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD

>From ifconfig:

eth2      Link encap:Ethernet  HWaddr 00:1D:92:B4:50:6E  
          inet addr:10.200.1.6  Bcast:10.200.1.255  Mask:255.255.255.0




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