ISCSI Initiator with Linux

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/etc/netplan/bond0.yaml 

network:
  version: 2
  renderer: networkd
  ethernets:
    eno1:
      dhcp4: false
      dhcp6: false
      optional: true
    eno2:
      dhcp4: false
      dhcp6: false
      optional: true
  bonds:
    bond0:
     interfaces:
     - eno1
     - eno2
     parameters:
       lacp-rate: slow
       mode: 802.3ad
       transmit-hash-policy: layer2
     addresses:
     - 10.71.112.135/16
     gateway4: 10.71.101.1 
     nameservers:
       addresses:
       - 10.71.111.11
       - 10.71.111.12
       search:
       - domain.de

/etc/netplan/iscsi.yaml 

network:
  version: 2
  renderer: networkd
  ethernets:
    enp132s0f0:
      dhcp4: false
      dhcp6: false
      mtu: 9000
      addresses:
        - 10.250.71.32/24
      set-name: iscsi0
      match:
        macaddress: a0:36:9f:d4:cd:1a
    enp132s0f1:
      dhcp4: false
      dhcp6: false
      mtu: 9000
      addresses:
        - 10.251.71.32/24
      set-name: iscsi1
      match:
        macaddress: a0:36:9f:d4:cd:18

# netplan apply
# ip a sh iscsi0
7: iscsi0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP group default
qlen 1000
link/ether a0:36:9f:d4:cd:1a brd ff:ff:ff:ff:ff:ff
inet 10.250.71.32/24 brd 10.250.71.255 scope global iscsi0
valid_lft forever preferred_lft forever
inet6 fe80::a236:9fff:fed4:cd1a/64 scope link
valid_lft forever preferred_lft forever

# ip a sh iscsi1
5: iscsi1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP group default
qlen 1000
link/ether a0:36:9f:d4:cd:18 brd ff:ff:ff:ff:ff:ff
inet 10.251.71.32/24 brd 10.251.71.255 scope global iscsi1
valid_lft forever preferred_lft forever
inet6 fe80::a236:9fff:fed4:cd18/64 scope link
valid_lft forever preferred_lft forever

# ip a sh bond0
12: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
group default qlen 1000
link/ether 32:2d:f2:c0:e2:3f brd ff:ff:ff:ff:ff:ff
inet 10.71.112.135/16 brd 10.71.255.255 scope global bond0
valid_lft forever preferred_lft forever
inet6 fe80::302d:f2ff:fed0:e23f/64 scope link
valid_lft forever preferred_lft forever

# ping -c 3 -M do -s 8972 -I iscsi0 10.250.71.1
PING 10.250.71.1 (10.250.71.1) from 10.250.71.32 iscsi0: 8972(9000) bytes of data.
8980 bytes from 10.250.71.1: icmp_seq=1 ttl=64 time=0.227 ms
8980 bytes from 10.250.71.1: icmp_seq=2 ttl=64 time=0.187 ms
8980 bytes from 10.250.71.1: icmp_seq=3 ttl=64 time=0.198 ms
--- 10.250.71.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2045ms
rtt min/avg/max/mdev = 0.187/0.204/0.227/0.016 ms

# ping -c 3 -M do -s 8972 -I iscsi1 10.251.71.1
PING 10.251.71.1 (10.251.71.1) from 10.251.71.32 iscsi1: 8972(9000) bytes of data.
8980 bytes from 10.251.71.1: icmp_seq=1 ttl=64 time=0.202 ms
8980 bytes from 10.251.71.1: icmp_seq=2 ttl=64 time=0.195 ms
8980 bytes from 10.251.71.1: icmp_seq=3 ttl=64 time=0.191 ms
--- 10.251.71.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2055ms
rtt min/avg/max/mdev = 0.191/0.196/0.202/0.004 ms

/etc/iscsi/initiatorname.iscsi 

## DO NOT EDIT OR REMOVE THIS FILE!
## If you remove this file, the iSCSI daemon will not start.
## If you change the InitiatorName, existing access control lists
## may reject this initiator.  The InitiatorName must be unique
## for each iSCSI initiator.  Do NOT duplicate iSCSI InitiatorNames.
InitiatorName=iqn.1993-08.org.debian:01:4efdaa48c123
# iscsiadm -m iface -I iscsi0 -o new
# iscsiadm -m iface -I iscsi1 -o new

# iscsiadm -m iface -I iscsi0 --op=update -n iface.net_ifacename -v iscsi0
# iscsiadm -m iface -I iscsi1 --op=update -n iface.net_ifacename -v iscsi1
 
# iscsiadm -m iface -I iscsi0
# iscsiadm -m iface -I iscsi1

# iscsiadm -m discovery -t st -p 10.250.71.1
iscsiadm: cannot make connection to 10.250.71.1: No route to host
iscsiadm: cannot make connection to 10.250.71.1: No route to host
iscsiadm: cannot make connection to 10.250.71.1: No route to host
iscsiadm: cannot make connection to 10.250.71.1: No route to host
iscsiadm: cannot make connection to 10.250.71.1: No route to host
iscsiadm: cannot make connection to 10.250.71.1: No route to host
iscsiadm: connection login retries (reopen_max) 5 exceeded
10.250.71.1:3260,1 iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20000:10.250.71.1

# iscsiadm -m discovery -t st -p 10.251.71.1
iscsiadm: cannot make connection to 10.251.71.1: No route to host
iscsiadm: cannot make connection to 10.251.71.1: No route to host
iscsiadm: cannot make connection to 10.251.71.1: No route to host
iscsiadm: cannot make connection to 10.251.71.1: No route to host
iscsiadm: cannot make connection to 10.251.71.1: No route to host
iscsiadm: cannot make connection to 10.251.71.1: No route to host
iscsiadm: connection login retries (reopen_max) 5 exceeded
10.251.71.1:3260,2 iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20001:10.251.71.1



# iscsiadm -m node -T  iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20000:10.250.71.1 --login
Logging in to [iface: iscsi0, target: iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20000:10.250.71.1, portal: 10.250.71.1,3260] (multiple)
Login to [iface: iscsi0, target: iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20000:10.250.71.1, portal: 10.250.71.1,3260] successful.

# iscsiadm -m node -T  iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20001:10.251.71.1 --login
Logging in to [iface: iscsi1, target: iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20001:10.251.71.1, portal: 10.251.71.1,3260] (multiple)
Login to [iface: iscsi1, target: iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20001:10.251.71.1, portal: 10.251.71.1,3260] successful.

# iscsiadm -m session -P 1
Target: iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20000:10.250.71.1 (non-flash)
        Current Portal: 10.250.71.1:3260,1
        Persistent Portal: 10.250.71.1:3260,1
                **********
                Interface:
                **********
                Iface Name: iscsi0
                Iface Transport: tcp
                Iface Initiatorname: iqn.1993-08.org.debian:01:4efdaa48c123
                Iface IPaddress: 10.250.71.32
                Iface HWaddress: <empty>
                Iface Netdev: iscsi0
                SID: 1
                iSCSI Connection State: LOGGED IN
                iSCSI Session State: LOGGED_IN
                Internal iscsid Session State: NO CHANGE
Target: iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20001:10.251.71.1 (non-flash)
        Current Portal: 10.251.71.1:3260,2
        Persistent Portal: 10.251.71.1:3260,2
                **********
                Interface:
                **********
                Iface Name: iscsi1
                Iface Transport: tcp
                Iface Initiatorname: iqn.1993-08.org.debian:01:4efdaa48c123
                Iface IPaddress: 10.251.71.32
                Iface HWaddress: <empty>
                Iface Netdev: iscsi1
                SID: 2
                iSCSI Connection State: LOGGED IN
                iSCSI Session State: LOGGED_IN
                Internal iscsid Session State: NO CHANGE

# lsscsi
[0:2:0:0]    disk    DELL     PERC H730 Mini   4.30  /dev/sda
[11:0:0:0]   cd/dvd  HL-DT-ST DVD+-RW GTA0N    A3C0  /dev/sr0
[12:0:0:1]   disk    HUAWEI   XSG1             4305  /dev/sdb
[13:0:0:1]   disk    HUAWEI   XSG1             4305  /dev/sdc


# systemctl status iscsid.service
# systemctl restart iscsid.service
# systemctl status iscsid.service
# iscsiadm -m session

# iscsiadm -m node --op=update -n node.conn[0].startup -v automatic
# iscsiadm -m node --op=update -n node.startup -v automatic

# iscsiadm -m node -T iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20000:10.250.71.1 |  grep node.session.timeo.replacement_timeout
node.session.timeo.replacement_timeout = 120

# iscsiadm -m node -T iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20001:10.251.71.1 |  grep node.session.timeo.replacement_timeout
node.session.timeo.replacement_timeout = 120

# iscsiadm -m node -T iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20000:10.250.71.1  -o update -n  node.session.timeo.replacement_timeout -v 10
# iscsiadm -m node -T iqn.2006-08.com.huawei:oceanstor:210028def5f846b5::20001:10.251.71.1  -o update -n  node.session.timeo.replacement_timeout -v 10



# /lib/udev/scsi_id --whitelisted --device=/dev/sda
361866da075bdee001f9a2ede2705b9ba
# /lib/udev/scsi_id --whitelisted --device=/dev/sdb
3628dee5100f846b5243be07d00000004
# /lib/udev/scsi_id --whitelisted --device=/dev/sdc
3628dee5100f846b5243be07d00000004


# cat /etc/multipath.conf
defaults {
    user_friendly_names yes
}
devices {
      device {
               vendor                  "HUAWEI"
               product                 "XSG1"
               path_grouping_policy    multibus
               path_checker            tur
               prio                    const
               path_selector           "round-robin 0"
               failback                immediate
               no_path_retry           15
}
}
blacklist {
 # devnode "^sd[a]$"
 # I highly recommend you blacklist by wwid instead of device name
 # blacklist /dev/sda
 wwid 361866da075bdee001f9a2ede2705b9ba
}
multipaths {
 multipath {
 wwid 3628dee5100f846b5243be07d00000004
 # alias here can be anything descriptive for your LUN
 alias veeamrepo
 }
}


# multipath -r
# multipath -ll
veeamrepo (3628dee5100f846b5243be07d00000004) dm-0 HUAWEI,XSG1
size=10T features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
`-+- policy='round-robin 0' prio=50 status=active
  |- 12:0:0:1 sdb 8:16 active ready running
  `- 13:0:0:1 sdc 8:32 active ready running

# ls -al /dev/mapper/veeamrepo
lrwxrwxrwx 1 root root 7 Okt 18 14:46 /dev/mapper/veeamrepo -> ../dm-0


# systemctl cat mnt-veeamrepo.mount
# /etc/systemd/system/mnt-veeamrepo.mount
[Unit]
Before=remote-fs.target
After=iscsi.service
Requires=iscsi.service
After=blockdev@dev-mapper-veeamrepo.target

[Mount]
Where=/mnt/veeamrepo
What=/dev/mapper/veeamrepo
Type=xfs
Options=defaults


Dokumente: 

   • https://linux.dell.com/files/whitepapers/iSCSI_Multipathing_in_Ubuntu_Server.pdf
   • https://www.suse.com/support/kb/doc/?id=000019648
   • https://ubuntu.com/server/docs/service-iscsi
   •
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