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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. If you leave the iscsid daemon running all # the time then leave this attribute commented out. # # iscsid.startup = /bin/systemctl start iscsid.socket iscsiuio.socket iscsid.startup = /bin/systemctl start iscsid.socket # # Default if you are not using systemd (uncomment to activate) # iscsid.startup = /usr/bin/service start 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 configure which CHAP algorithms to enable set # node.session.auth.chap_algs to a comma seperated list. # The algorithms should be listen with most prefered first. # Valid values are MD5, SHA1, SHA256, and SHA3-256. # The default is MD5. #node.session.auth.chap_algs = SHA3-256,SHA256,SHA1,MD5 # 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 = 120 # 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 = 5 # 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 = 5 # 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 # When iscsid starts up it recovers existing sessions, if possible. # If the target for a session has gone away when this occurs, the # iscsid daemon normally tries to reestablish each session, # in succession, in the background, by trying again every two # seconds, until all sessions are restored. This configuration # variable can limits the number of retries for each session. # For example, setting reopen_max=150 would mean that each session # recovery was limited to about five minutes. # node.session.reopen_max = 0 #************ # 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 # To prevent doing automatic scans that would add unwanted luns to the system # we can disable them and have sessions only do manually requested scans. # Automatic scans are performed on startup, on login, and on AEN/AER reception # on devices supporting it. For HW drivers all sessions will use the value # defined in the configuration file. This configuration option is independent # of scsi_mod scan parameter. (The default behavior is auto): node.session.scan = auto