iscsiadm命令详解

 ISCSIADM

NAME

iscsiadm - open-iscsi administration utility  

SYNOPSIS

iscsiadm -m discovery [ -hV ] [ -d debug_level ] [ -P printlevel ] [ -I iface -t type -p ip:port [ -l ] ] | [ -o operation ] [ -n name ] [ -v value ]

iscsiadm -m node [ -hV ] [ -d debug_level ] [ -P printlevel ] [ -L all,manual,automatic ] [ -U all,manual,automatic ] [ -S ] [ [ -T targetname -p ip:port -I iface ] [ -l | -u | -R | -s] ] [ [ -o operation ] [ -n name ] [ -v value ] [ -p ip:port ] ]

iscsiadm -m session [ -hV ] [ -d debug_level ] [ -P printlevel ] [ -r sessionid | sysfsdir [ -R ] [ -u | -s ] ]

iscsiadm -m iface [ -hV ] [ -d debug_level ] [ -P printlevel ] [ -I ifacename ] [ [ -o operation ] [ -n name ] [ -v value ] ]

iscsiadm -m fw [-l]

iscsiadm -m host [ -P printlevel ] [ -H hostno ]

iscsiadm -k priority

 

DESCRIPTION

The iscsiadm utility is a command-line tool allowing discovery and login to iSCSI targets, as well as access and management of the open-iscsi database.

Open-iscsi does not use the term node as defined by the iSCSI RFC, where a node is a single iSCSI initiator or target. Open-iscsi uses the term node to refer to a portal on a target.

For session mode, a session id (sid) is used. The sid of a session can be found by running iscsiadm -m session -P 1. The session id and sysfs path are not currently persistent and is partially determined by when the session is setup.

Note that many of the node and discovery operations require that the iSCSI daemon (iscsid) be running.

 

OPTIONS

-d,  --debug= debug_level

print debugging information. Valid values for debug_level are 0 to 8.

-h,  --help

display help text and exit

-I,  --interface [iface]

The interface argument specifies the iSCSI interface to use for the operation. iSCSI interfaces (iface) are defined in /etc/iscsi/ifaces. For hardware iSCSI (qla4xxx) the iface config must have the hardware address (iface.hwaddress = port's MAC address) and the driver/transport_name (iface.transport_name). The iface's name is then the filename of the iface config. For software iSCSI, the iface config must have either the hardware address (iface.hwaddress), or the network layer's interface name (iface.net_ifacename), and it must have the driver/transport_name

The available drivers/iscsi_transports are tcp (software iSCSI over TCP/IP), iser (software iSCSI over infinniband), or qla4xxx (Qlogic 4XXXX HBAs). The hwaddress is the MAC address or for software iSCSI it may be the special value "default" which directs the initiator to not bind the session to a specific hardware resource and instead allow the network or infinniband layer to decide what to do. There is no need to create a iface config with the default behavior. If you do not specify a iface, then the default behavior is used.

As mentioned above there is a special iface name default. There are three others -- cxgb3i, bnx2i and iser, which does not bind the session to a specific card, but will bind the session to the cxgb3i, bnx2i or iser transport. These are experimental and the use is not supported as a stable interface yet.

In discovery mode multiple interfaces can be specific by passing in multiple -I/--interface instances. For example,

"iscsiadm -m discovery -t st -p mytarget -I iface0 -I iface2"

Will direct iscsiadm to setup the node db to create records which will create sessions though the two intefaces passed in.

In node mode, only a single interface is supported in each call to iscsiadm.

This option is valid for discovery, node and iface mode.

-k,  --killiscsid= [priority]

Currently priority must be zero. This will immediately stop all iscsid operations and shutdown iscsid. It does not logout any sessions. Running this command is the same as doing "killall iscsid". Neither should normally not be used, because if iscsid is doing error recovery or if there is an error while iscsid is not running, the system may not be able to recover. This command and iscsid's SIGTERM handling are experimental.

-l,  --login

For node and fw mode, login to a specified record. For discovery mode, login to all discovered targets.

This option is only valid for discovery and node modes.

-L,  --loginall== [all|manual|automatic]

For node mode, login all sessions with the node or conn startup values passed in or all running sesssion, except ones marked onboot, if all is passed in.

This option is only valid for node mode (it is valid but not functional for session mode).

-m, --mode  op

specify the mode.  op must be one of  discovery,  node,  fw,  host iface or  session.

If no other options are specified: for  discovery and  node, all of their respective records are displayed; for  session, all active sessions and connections are displayed; for  fw, all boot firmware values are displayed; for  host, all iSCSI hosts are displayed; and for  iface, all ifaces setup in /etc/iscsi/ifaces are displayed.

-n,  --name= name

Specify a field  name in a record. For use with the  update operator.

-o,  --op= op

Specifies a database operator  op.  op must be one of  new,  delete,  update or  show.

This option is valid for all modes except fw. Delete should not be used on a running session. If it is iscsiadm will stop the session and then delete the record.

new creates a new database record for a given  portal (IP address and port number). In discovery mode, iscsiadm will create new records for portals returned by the target.

delete deletes a specified  recid. In discovery node, if iscsiadm is performing discovery it will delete records for portals that are no longer returned.

update will update the  recid with  name to the specified  value. In discovery node, if iscsiadm is performing discovery the  recid,  name and  value arguments are not needed. The update operation will operate on the portals returned by the target, and will update the node records with info from the config file and command line.

show is the default behaviour for node, discovery and iface mode. It is also used when there are no commands passed into session mode and a running sid is passed in.  nameand  value are currently ignored when used with  show.

-p,  --portal= ip[:port]

Use target portal with ip-address  ip and  port, the default  port value is 3260.

This option is only valid for discovery, or for node operations with the  new operator.

This should be used along with --target in node mode, to specify what the open-iscsi docs refer to as a node or node record. Note: open-iscsi's use of the word node, does not match the iSCSI RFC's iSCSI Node term.

-P,  --print= printlevel

If in node mode print nodes in tree format. If in session mode print sessions in tree format. If in discovery mode print the nodes in tree format.

-T,  --targetname= targetname

Use target  targetname.

This should be used along with --portal in node mode, to specify what the open-iscsi docs refer to as a node or node record. Note: open-iscsi's use of the word node, does not match the iSCSI RFC's iSCSI Node term.

-r,  --sid= sid | sysfsdir

Use session ID  sid. The sid of a session can be found from running iscsiadm in session mode with the --info argument.

Instead of sid, a sysfs path containing the session can be used. For example using one of the following: /sys/devices/platform/hostH/sessionS/targetH:B:I/H:B:I:L, /sys/devices/platform/hostH/sessionS/targetH:B:I, or /sys/devices/platform/hostH/sessionS, for the sysfsdir argument would result in the session with sid S to be used.

sid | sysfsdir is only required for session mode.

-R,  --rescan

In session mode, if sid is also passed in rescan the session. If no sid has been passed in rescan all running sessions.

In node mode, rescan a session running through the target, portal, iface tuple passed in.

-s,  --stats

Display session statistics.

-S,  --show

When displaying records, do not hide masked values, such as the CHAP secret (password).

This option is only valid for node and session mode.

-t,  --type= type

type must be  sendtargets (or abbreviated as  st),  slp,  isns or  fw. Currently only sendtargets, fw, and iSNS is supported, see the DISCOVERY TYPES section.

This option is only valid for discovery mode.

-u,  --logout

logout for a specified record.

This option is only valid for node and session mode.

-U,  --logoutall== [all,manual,automatic]

logout all sessions with the node or conn startup values passed in or all running sesssion, except ones marked onboot, if all is passed in.

This option is only valid for node mode (it is valid but not functional for session mode).

-v,  --value= value

Specify a  value for use with the  update operator.

This option is only valid for node mode.

-V,  --version

display version and exit

 

DISCOVERY TYPES

iSCSI defines 3 discovery types: SendTargets, SLP, and iSNS.

SendTargets

A native iSCSI protocol which allows each iSCSI target to send a list of available targets to the initiator.

SLP

Optionally an iSCSI target can use the Service Location Protocol (SLP) to announce the available targets. The initiator can either implement SLP queries directly or can use a separate tool to acquire the information about available targets.

iSNS

iSNS (Internet Storage Name Service) records information about storage volumes within a larger network. To utilize iSNS, the address of the iSNS server must be set in iscsid.conf using the "isns.address" value, and iscsiadm must be run in discovery mode with the "isns" discovery type.

iSNS support in open-iscsi is experimental. The iscsid.conf settings, iscsiadm syntax and node DB layout may change.

fw

Several NICs and systems contain a mini iSCSI initiator which can be used for boot. To get the values used for boot the fw option can be used. Doing fw discovery, does not store persistent records in the node or discovery DB, because the values are stored in the system's or NIC's resource.

Performing fw discovery will print the portals, like with other discovery methods. To see other settings like CHAP values and initiator settings, like you would in node mode, run "iscsiadm -m fw".

fw support in open-iscsi is experimental. The settings and iscsiadm syntax and output format may change.

iscsiadm supports the iSNS (isns) or SendTargets (st) discovery type. An SLP implementation is under development.

 

EXAMPLES

Discover targets at a given IP address:

        iscsiadm --mode discovery --type sendtargets --portal 192.168.1.10

Login, must use a node record id found by the discovery:

        iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260 --login

Logout:

        iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260 --logout

List node records:

        iscsiadm --mode node


Display all data for a given node record:

        iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260

 

FILES

/etc/iscsi/iscsid.conf

The configuration file read by  iscsid and  iscsiadm on startup.

/etc/iscsi/initiatorname.iscsi

The file containing the iSCSI InitiatorName and InitiatorAlias read by  iscsid and  iscsiadm on startup.

/etc/iscsi/nodes/

This directory contains the nodes with their targets.

/etc/iscsi/send_targets

This directory contains the portals.