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- #
- # Open-iSCSI default configuration.
- # Could be located at /etc/iscsi/iscsid.conf or ~/.iscsid.conf
- #
- # Note: To set any of these values for a specific node/session run
- # the iscsiadm --mode node --op command for the value. See the README
- # and man page for iscsiadm for details on the --op command.
- #
- ######################
- # iscsid daemon config
- ######################
- # If you want iscsid to start the first time an iscsi tool
- # needs to access it, instead of starting it when the init
- # scripts run, set the iscsid startup command here. This
- # should normally only need to be done by distro package
- # maintainers.
- #
- # Default for Fedora and RHEL. (uncomment to activate).
- # iscsid.startup = /etc/rc.d/init.d/iscsid force-start
- #
- # Default for upstream open-iscsi scripts (uncomment to activate).
- iscsid.startup = /sbin/iscsid
- # Check for active mounts on devices reachable through a session
- # and refuse to logout if there are any. Defaults to "No".
- # iscsid.safe_logout = Yes
- #############################
- # NIC/HBA and driver settings
- #############################
- # open-iscsi can create a session and bind it to a NIC/HBA.
- # To set this up see the example iface config file.
- #*****************
- # Startup settings
- #*****************
- # To request that the iscsi initd scripts startup a session set to "automatic".
- node.startup = automatic
- #
- # To manually startup the session set to "manual". The default is manual.
- node.startup = manual
- # For "automatic" startup nodes, setting this to "Yes" will try logins on each
- # available iface until one succeeds, and then stop. The default "No" will try
- # logins on all available ifaces simultaneously.
- node.leading_login = No
- # *************
- # CHAP Settings
- # *************
- # To enable CHAP authentication set node.session.auth.authmethod
- # to CHAP. The default is None.
- #node.session.auth.authmethod = CHAP
- # To set a CHAP username and password for initiator
- # authentication by the target(s), uncomment the following lines:
- #node.session.auth.username = username
- #node.session.auth.password = password
- # To set a CHAP username and password for target(s)
- # authentication by the initiator, uncomment the following lines:
- #node.session.auth.username_in = username_in
- #node.session.auth.password_in = password_in
- # To enable CHAP authentication for a discovery session to the target
- # set discovery.sendtargets.auth.authmethod to CHAP. The default is None.
- #discovery.sendtargets.auth.authmethod = CHAP
- # To set a discovery session CHAP username and password for the initiator
- # authentication by the target(s), uncomment the following lines:
- #discovery.sendtargets.auth.username = username
- #discovery.sendtargets.auth.password = password
- # To set a discovery session CHAP username and password for target(s)
- # authentication by the initiator, uncomment the following lines:
- #discovery.sendtargets.auth.username_in = username_in
- #discovery.sendtargets.auth.password_in = password_in
- # ********
- # Timeouts
- # ********
- #
- # See the iSCSI README's Advanced Configuration section for tips
- # on setting timeouts when using multipath or doing root over iSCSI.
- #
- # To specify the length of time to wait for session re-establishment
- # before failing SCSI commands back to the application when running
- # the Linux SCSI Layer error handler, edit the line.
- # The value is in seconds and the default is 120 seconds.
- # Special values:
- # - If the value is 0, IO will be failed immediately.
- # - If the value is less than 0, IO will remain queued until the session
- # is logged back in, or until the user runs the logout command.
- node.session.timeo.replacement_timeout = 86400
- # To specify the time to wait for login to complete, edit the line.
- # The value is in seconds and the default is 15 seconds.
- node.conn[0].timeo.login_timeout = 15
- # To specify the time to wait for logout to complete, edit the line.
- # The value is in seconds and the default is 15 seconds.
- node.conn[0].timeo.logout_timeout = 15
- # Time interval to wait for on connection before sending a ping.
- node.conn[0].timeo.noop_out_interval = 0
- # To specify the time to wait for a Nop-out response before failing
- # the connection, edit this line. Failing the connection will
- # cause IO to be failed back to the SCSI layer. If using dm-multipath
- # this will cause the IO to be failed to the multipath layer.
- node.conn[0].timeo.noop_out_timeout = 0
- # To specify the time to wait for abort response before
- # failing the operation and trying a logical unit reset edit the line.
- # The value is in seconds and the default is 15 seconds.
- node.session.err_timeo.abort_timeout = 15
- # To specify the time to wait for a logical unit response
- # before failing the operation and trying session re-establishment
- # edit the line.
- # The value is in seconds and the default is 30 seconds.
- node.session.err_timeo.lu_reset_timeout = 30
- # To specify the time to wait for a target response
- # before failing the operation and trying session re-establishment
- # edit the line.
- # The value is in seconds and the default is 30 seconds.
- node.session.err_timeo.tgt_reset_timeout = 30
- #******
- # Retry
- #******
- # To specify the number of times iscsid should retry a login
- # if the login attempt fails due to the node.conn[0].timeo.login_timeout
- # expiring modify the following line. Note that if the login fails
- # quickly (before node.conn[0].timeo.login_timeout fires) because the network
- # layer or the target returns an error, iscsid may retry the login more than
- # node.session.initial_login_retry_max times.
- #
- # This retry count along with node.conn[0].timeo.login_timeout
- # determines the maximum amount of time iscsid will try to
- # establish the initial login. node.session.initial_login_retry_max is
- # multiplied by the node.conn[0].timeo.login_timeout to determine the
- # maximum amount.
- #
- # The default node.session.initial_login_retry_max is 8 and
- # node.conn[0].timeo.login_timeout is 15 so we have:
- #
- # node.conn[0].timeo.login_timeout * node.session.initial_login_retry_max =
- # 120 seconds
- #
- # Valid values are any integer value. This only
- # affects the initial login. Setting it to a high value can slow
- # down the iscsi service startup. Setting it to a low value can
- # cause a session to not get logged into, if there are distuptions
- # during startup or if the network is not ready at that time.
- node.session.initial_login_retry_max = 8
- ################################
- # session and device queue depth
- ################################
- # To control how many commands the session will queue set
- # node.session.cmds_max to an integer between 2 and 2048 that is also
- # a power of 2. The default is 128.
- node.session.cmds_max = 128
- # To control the device's queue depth set node.session.queue_depth
- # to a value between 1 and 1024. The default is 32.
- node.session.queue_depth = 32
- ##################################
- # MISC SYSTEM PERFORMANCE SETTINGS
- ##################################
- # For software iscsi (iscsi_tcp) and iser (ib_iser) each session
- # has a thread used to transmit or queue data to the hardware. For
- # cxgb3i you will get a thread per host.
- #
- # Setting the thread's priority to a lower value can lead to higher throughput
- # and lower latencies. The lowest value is -20. Setting the priority to
- # a higher value, can lead to reduced IO performance, but if you are seeing
- # the iscsi or scsi threads dominate the use of the CPU then you may want
- # to set this value higher.
- #
- # Note: For cxgb3i you must set all sessions to the same value, or the
- # behavior is not defined.
- #
- # The default value is -20. The setting must be between -20 and 20.
- node.session.xmit_thread_priority = -20
- #***************
- # iSCSI settings
- #***************
- # To enable R2T flow control (i.e., the initiator must wait for an R2T
- # command before sending any data), uncomment the following line:
- #
- #node.session.iscsi.InitialR2T = Yes
- #
- # To disable R2T flow control (i.e., the initiator has an implied
- # initial R2T of "FirstBurstLength" at offset 0), uncomment the following line:
- #
- # The defaults is No.
- node.session.iscsi.InitialR2T = No
- #
- # To disable immediate data (i.e., the initiator does not send
- # unsolicited data with the iSCSI command PDU), uncomment the following line:
- #
- #node.session.iscsi.ImmediateData = No
- #
- # To enable immediate data (i.e., the initiator sends unsolicited data
- # with the iSCSI command packet), uncomment the following line:
- #
- # The default is Yes
- node.session.iscsi.ImmediateData = Yes
- # To specify the maximum number of unsolicited data bytes the initiator
- # can send in an iSCSI PDU to a target, edit the following line.
- #
- # The value is the number of bytes in the range of 512 to (2^24-1) and
- # the default is 262144
- node.session.iscsi.FirstBurstLength = 262144
- # To specify the maximum SCSI payload that the initiator will negotiate
- # with the target for, edit the following line.
- #
- # The value is the number of bytes in the range of 512 to (2^24-1) and
- # the defauls it 16776192
- node.session.iscsi.MaxBurstLength = 16776192
- # To specify the maximum number of data bytes the initiator can receive
- # in an iSCSI PDU from a target, edit the following line.
- #
- # The value is the number of bytes in the range of 512 to (2^24-1) and
- # the default is 262144
- node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144
- # To specify the maximum number of data bytes the initiator will send
- # in an iSCSI PDU to the target, edit the following line.
- #
- # The value is the number of bytes in the range of 512 to (2^24-1).
- # Zero is a special case. If set to zero, the initiator will use
- # the target's MaxRecvDataSegmentLength for the MaxXmitDataSegmentLength.
- # The default is 0.
- node.conn[0].iscsi.MaxXmitDataSegmentLength = 0
- # To specify the maximum number of data bytes the initiator can receive
- # in an iSCSI PDU from a target during a discovery session, edit the
- # following line.
- #
- # The value is the number of bytes in the range of 512 to (2^24-1) and
- # the default is 32768
- #
- discovery.sendtargets.iscsi.MaxRecvDataSegmentLength = 32768
- # To allow the targets to control the setting of the digest checking,
- # with the initiator requesting a preference of enabling the checking, uncomment# one or both of the following lines:
- node.conn[0].iscsi.HeaderDigest = CRC32C,None
- node.conn[0].iscsi.DataDigest = CRC32C,None
- #
- # To allow the targets to control the setting of the digest checking,
- # with the initiator requesting a preference of disabling the checking,
- # uncomment one or both of the following lines:
- #node.conn[0].iscsi.HeaderDigest = None,CRC32C
- #node.conn[0].iscsi.DataDigest = None,CRC32C
- #
- # To enable CRC32C digest checking for the header and/or data part of
- # iSCSI PDUs, uncomment one or both of the following lines:
- #node.conn[0].iscsi.HeaderDigest = CRC32C
- #node.conn[0].iscsi.DataDigest = CRC32C
- #
- # To disable digest checking for the header and/or data part of
- # iSCSI PDUs, uncomment one or both of the following lines:
- #node.conn[0].iscsi.HeaderDigest = None
- #node.conn[0].iscsi.DataDigest = None
- #
- # The default is to never use DataDigests or HeaderDigests.
- #
- # For multipath configurations, you may want more than one session to be
- # created on each iface record. If node.session.nr_sessions is greater
- # than 1, performing a 'login' for that node will ensure that the
- # appropriate number of sessions is created.
- node.session.nr_sessions = 1
- #************
- # Workarounds
- #************
- # Some targets like IET prefer after an initiator has sent a task
- # management function like an ABORT TASK or LOGICAL UNIT RESET, that
- # it does not respond to PDUs like R2Ts. To enable this behavior uncomment
- # the following line (The default behavior is Yes):
- node.session.iscsi.FastAbort = Yes
- # Some targets like Equalogic prefer that after an initiator has sent
- # a task management function like an ABORT TASK or LOGICAL UNIT RESET, that
- # it continue to respond to R2Ts. To enable this uncomment this line
- # node.session.iscsi.FastAbort = No
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