Subversion Repositories configs

#

# 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. If you leave the iscsid daemon running all

# the time then leave this attribute commented out.

#

# Default for Fedora and RHEL. (uncomment to activate).

iscsid.startup = /bin/systemctl start iscsid.socket iscsiuio.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 automatic.

node.startup = automatic

# 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

# the following lines (Data digests are not supported.):

#node.conn[0].iscsi.HeaderDigest = 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 the following line:

#node.conn[0].iscsi.HeaderDigest = None,CRC32C

#

# To enable CRC32C digest checking for the header and/or data part of

# iSCSI PDUs, uncomment the following line:

#node.conn[0].iscsi.HeaderDigest = CRC32C

#

# To disable digest checking for the header and/or data part of

# iSCSI PDUs, uncomment the following line:

#node.conn[0].iscsi.HeaderDigest = None

#

# The default is to never use DataDigests or HeaderDigests.

#

node.conn[0].iscsi.HeaderDigest = None

# 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