[stgt] tgt-admin behavior with multiple targets and same account name
Chandra Seetharaman
sekharan at us.ibm.com
Mon Mar 1 23:00:14 CET 2010
Hello,
I defined two targets in my /etc/tgt/targets.conf file and have the same
username/password (incoming and outgoing) for both the targets.
After running "tgt-admin -e", I see that the "Account Information" on my
first target is empty.
Looking at the script (tgt-admin), I found that it deletes the account
before defining an account, which is the cause of the problem I am
seeing.
Can somebody tell me why it is implemented that way (instead of using
the existing account) ?
I couldn't find anything in the SPECS (RFC 3270) about multiple targets
having the same username/password. Please send me a snippet if it is
otherwise. (Even if that is the case, shouldn't we be failing the second
operation instead of silently removing the old one ?)
Thanks,
chandra
Attachment: my targets.conf file
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# This is a sample config file for tgt-admin.
# By default, tgt-admin looks for its config file in /etc/tgt/targets.conf
#
# The "#" symbol disables the processing of a line.
# This one includes other config files:
#include /etc/tgt/temp/*.conf
# Set the driver. If not specified, defaults to "iscsi".
default-driver iscsi
# Continue if tgtadm exits with non-zero code (equivalent of
# --ignore-errors command line option)
ignore-errors yes
# Sample target with one LUN only. Defaults to allow access for all initiators:
#<target iqn.2008-09.com.example:server.target1>
# backing-store /dev/LVM/somedevice
#</target>
# Similar, but we use "direct-store" instead of "backing-store".
# "direct-store" reads drive parameters with sg_inq command and sets them to
# the target.
# Parameters fatched with sg_inq are:
# - Vendor identification
# - Product identification
# - Product revision level
# - Unit serial number (if present)
# We also specify "incominguser".
#<target iqn.2008-09.com.example:server.target2>
# direct-store /dev/sdd
# incominguser someuser secretpass12
#</target>
# An example with multiple LUNs, disabled write-cache (tgtd enables write-cache
# by default) and vendor identification set to "MyVendor"
#<target iqn.2008-09.com.example:server.target3>
# backing-store /dev/LVM/somedevice1 # Becomes LUN 1
# backing-store /dev/LVM/somedevice2 # Becomes LUN 2
# backing-store /dev/LVM/somedevice3 # Becomes LUN 3
# write-cache off
# vendor_id MyCompany Inc.
#</target>
# Similar to the one above, but we fetch vendor_id, product_id, product_rev and
# scsi_sn from the disks.
# Vendor identification (vendor_id) is replaced in all disks by "MyVendor"
#<target iqn.2008-09.com.example:server.target4>
# direct-store /dev/sdb # Becomes LUN 1
# direct-store /dev/sdc # Becomes LUN 2
# direct-store /dev/sdd # Becomes LUN 3
# write-cache off
# vendor_id MyCompany Inc.
#</target>
# Note that "first-device-first-lun numbering" will work only for simple
# scenarios above, where _only_ direct-store _or_ backing-store is used.
# If you mix backing-store and direct-store, then all backing-store entries
# are processed before direct-store-entries.
#<target iqn.2008-09.com.example:server.target4>
# direct-store /dev/sdb # Becomes LUN 3
# backing-store /dev/sdc # Becomes LUN 1
# direct-store /dev/sdd # Becomes LUN 4
# backing-store /dev/sde # Becomes LUN 2
#</target>
# Even more complicated example - each device has different parameters.
# You can use indentation to make the config file more readable.
# Note that LUNs will be assigned more or less randomly here (and still
# backing-store get LUNs assigned before drect-store).
# You can specify multiple mode_page parameters (they are commented out
# in this example).
# Note that some parameters (write-cache, scsi_sn) were specified "globally".
# "Global" parameters will be applied to all LUNs; they can be overwritten
# "locally", per LUN.
# If lun is not specified, it will be allocated automatically (first available).
#<target iqn.2008-09.com.example:server.target5>
# <direct-store /dev/sdd>
# vendor_id VENDOR1
# removable 1
# device-type cd
# lun 1
# </direct-store>
# <direct-store /dev/sda>
# vendor_id VENDOR2
# lun 2
# </direct-store>
# <backing-store /dev/sdb1>
# vendor_id back1
# scsi_sn SERIAL
# write-cache on
# lun 3 # lun is commented out - will be allocated automatically
# </backing-store>
# <backing-store /dev/sdd1>
# vendor_id back2
#mode_page 8:0:18:0x10:0:0xff....
#mode_page 8:0:18:0x10:0:0xff....
#bs-type aio
# lun 15
# </backing-store>
# Some more parameters which can be specified locally or globally:
#scsi_id ...
#scsi_sn ...
#vendor_id ...
#product_id ...
#product_rev ...
#sense_format ...
#removable ...
#online ...
#path ...
#mode_page 8:0:18:0x10:0:0xff....
#mode_page 8:0:18:0x10:0:0xff....
#device-type ...
#bs-type ... # backing store type - default rdwr, can be aio, mmap, etc...
#allow-in-use yes # if specified globally, can't be overwritten locally
# write-cache off
# scsi_sn multipath-10
# Parameters below are only global. They can't be configured per LUN.
# Only allow connections from 192.168.100.1 and 192.168.200.5
# initiator-address 192.168.100.1
# initiator-address 192.168.200.5
# Tuning parameters (global, per target)
#MaxRecvDataSegmentLength 8192
#MaxXmitDataSegmentLength 8192
#HeaderDigest None
#DataDigest None
#InitialR2T Yes
#MaxOutstandingR2T 1
#ImmediateData Yes
#FirstBurstLength 65536
#MaxBurstLength 262144
#DataPDUInOrder Yes
#DataSequenceInOrder Yes
#ErrorRecoveryLevel 0
#IFMarker No
#OFMarker No
#DefaultTime2Wait 2
#DefaultTime2Retain 20
#OFMarkInt Reject
#IFMarkInt Reject
#MaxConnections 1
# Allowed incoming users
# incominguser user1 secretpass12
# incominguser user2 secretpass23
# Outgoing user
# outgoinguser userA secretpassA
#</target>
# The device will have lun 1 unless you specify something else
#<target iqn.2008-09.com.example:server.target6>
# backing-store /dev/LVM/somedevice
# lun 10
#</target>
# Devices which are in use (by system: mounted, for swap, part of RAID, or by
# userspace: dd, by tgtd for another target etc.) can't be used, unless you use
# --force flag or add 'allow-in-use yes' option
#<target iqn.2008-09.com.example:server.target7>
# backing-store /dev/LVM/somedevice
# allow-in-use yes
#</target>
#<target iqn.2008-09.com.example:server.target8>
# <backing-store /dev/LVM/somedevice>
# scsi_sn serial1
# </backing-store>
# <backing-store /dev/LVM/somedevice2>
# scsi_sn serial2
# </backing-store>
# allow-in-use yes
#</target>
# Not supported configurations, and therefore, commented out:
#<target iqn.2008-09.com.example:server.target9>
# backing-store /dev/LVM/somedevice1
# backing-store /dev/LVM/somedevice2
# lun 10
# lun 11
#</target>
#<target iqn.2008-09.com.example:server.target10>
# <direct-store /dev/sdd>
# vendor_id VENDOR1
# </direct-store>
#
# direct-store /dev/sdc
#</target>
# This one will break the parser:
#<target iqn.2008-09.com.example:server.target11>
# <direct-store /dev/sdd>
# vendor_id VENDOR1
# </direct-store>
#
# direct-store /dev/sdc
#
# <direct-store /dev/sdd>
# vendor_id VENDOR1
# </direct-store>
#</target>
<target iqn.2010-02.com.test244_test:01>
# List of files to export as LUNs
<backing-store /device1/file1>
vendor_id test244
product_id target1
scsi_id test244_target1_lun1
lun 1
</backing-store>
<backing-store /device1/file2>
vendor_id test244
product_id target1
scsi_id test244_target1_lun2
lun 2
</backing-store>
<backing-store /device1/file3>
vendor_id test244
product_id target1
scsi_id test244_target1_lun3
lun 3
</backing-store>
# Authentication :
# if no "incominguser" is specified, it is not used
outgoinguser seller testpassw0rd
incominguser customer Longsw0rd
# Access control :
# defaults to ALL if no "initiator-address" is specified
initiator-address 10.0.0.146
</target>
<target iqn.2010-02.com.test244_test:02>
# List of files to export as LUNs
<backing-store /device1/file4>
vendor_id test244
product_id target2
scsi_id test244_target2_lun1
lun 1
</backing-store>
<backing-store /device1/file5>
vendor_id test244
product_id target2
scsi_id test244_target2_lun2
lun 2
</backing-store>
# Authentication :
# if no "incominguser" is specified, it is not used
outgoinguser seller testpassw0rd
incominguser customer Longsw0rd
# Access control :
# defaults to ALL if no "initiator-address" is specified
initiator-address 10.0.0.146
</target>
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