issues migrating to targetcli/LIO from ietd
by Matt Coleman
Hello,
I'm updating some code to use LIO/targetcli/configfs instead of ietd and I've run into several issues.
I'll need to be able to do the following:
* list sessions
* retrieve session details
* close sessions
* create read-only fileio backstores
I created a target and accessed it with iscsiadm on the same system. I noticed that `targetcli sessions list` doesn't show a session. This ticket, https://bugzilla.redhat.com/show_bug.cgi?id=1161489, appears to describe the issue. Is session-related functionality broken in targetcli? Is session information accessible via sysfs or configfs?
For read-only fileio backstores, I could remove write permissions from the file before creating the fileio backstore. Is there any way to make it read-only without changing the file's permissions?
Thanks,
Matt
6 years
loopback naa wwn check
by Lukas Herbolt
Hey all,
I was playing with loopback target and I reached situation where I
cannot create any other
target apart of those starting with 1,2,5. Reading the code it seems
to be b/c of following [1].
Second issue I have found is in the generate_wwn function [2]. When
creating the NAA or EUI,
You are actually stick to the one OUI (Organizationally Unique
Identifier) 001405 which belongs
to OpenIB (Qlogic corporation). I think it would be better to use
private OUIs listed at [3].
Attaching code which generates and check's OUIs.
[1]
---
def normalize_wwn(wwn_types, wwn):
'''
Take a WWN as given by the user and convert it to a standard text
representation.
Returns (normalized_wwn, wwn_type), or exception if invalid wwn.
'''
wwn_test = {
'free': lambda wwn: True,
'iqn': lambda wwn: \
re.match("iqn\.[0-9]{4}-[0-1][0-9]\..*\..*", wwn) \
and not re.search(' ', wwn) \
and not re.search('_', wwn),
'naa': lambda wwn: re.match("naa\.[125][0-9a-fA-F]{15}$", wwn),
'eui': lambda wwn: re.match("eui\.[0-9a-f]{16}$", wwn),
'ib': lambda wwn: re.match("ib\.[0-9a-f]{32}$", wwn),
'unit_serial': lambda wwn: \
re.match("[0-9A-Fa-f]{8}(-[0-9A-Fa-f]{4}){3}-[0-9A-Fa-f]{12}$", wwn),
}
---
[2]
---
def generate_wwn(wwn_type):
'''
Generates a random WWN of the specified type:
- unit_serial: T10 WWN Unit Serial.
- iqn: iSCSI IQN
- naa: SAS NAA address
@param wwn_type: The WWN address type.
@type wwn_type: str
@returns: A string containing the WWN.
'''
wwn_type = wwn_type.lower()
if wwn_type == 'free':
return str(uuid.uuid4())
if wwn_type == 'unit_serial':
return str(uuid.uuid4())
elif wwn_type == 'iqn':
localname = socket.gethostname().split(".")[0]
localarch = os.uname()[4].replace("_", "")
prefix = "iqn.2003-01.org.linux-iscsi.%s.%s" % (localname, localarch)
prefix = prefix.strip().lower()
serial = "sn.%s" % str(uuid.uuid4())[24:]
return "%s:%s" % (prefix, serial)
elif wwn_type == 'naa':
# see http://standards.ieee.org/develop/regauth/tut/fibre.pdf
# 5 = IEEE registered
# 001405 = OpenIB OUI (they let us use it I guess?)
# rest = random
return "naa.5001405" + uuid.uuid4().hex[-9:]
elif wwn_type == 'eui':
return "eui.001405" + uuid.uuid4().hex[-10:]
else:
raise ValueError("Unknown WWN type: %s" % wwn_type)
---
[3]
http://standards-oui.ieee.org/oui/oui.txt
--
Lukas Herbolt
SME
Red Hat
6 years
