[2] iSCSI Initiator

Przykłady tutaj opierają się na następującym schemacie sieci:

[1] Skonfiguruj iSCSI Initiator aby połączyć się z iSCSI Target

[root@lsr02vm ~]# dnf install iscsi-initiator-utils

[root@lsr02vm ~]# mcedit /etc/iscsi/initiatorname.iscsi

# zmień nazwę IQN na taką jaką ustawiłeś w iSCSI Target na serwerze

InitiatorName=iqn.2020-06.lab.zicher:node01.initiator01

[root@lsr02vm ~]# mcedit /etc/iscsi/iscsid.conf

# linia 58: odkomentuj
node.session.auth.authmethod = CHAP
# linia 62,63: odkomentuj i wpisz nazwę użytkownika i hasło takie, jakie ustawiłeś w iSCSI Target na serwerze
node.session.auth.username = username
node.session.auth.password = password

# poszukaj Target'u
[root@lsr02vm ~]# iscsiadm -m discovery -t sendtargets -p 192.168.100.1
192.168.100.1:3260,1 iqn.2020-06.lab.zicher:lsr01vm.target01

# potwierdź status po znalezieniu Target'u
[root@lsr02vm ~]# iscsiadm -m node -o show
# BEGIN RECORD 2.0-877
node.name = iqn.2020-06.lab.zicher:lsr01vm.target01
node.tpgt = 1
node.startup = automatic
node.leading_login = No
iface.iscsi_ifacename = default
iface.net_ifacename = <empty>
iface.ipaddress = <empty>
iface.prefix_len = 0
iface.hwaddress = <empty>
iface.transport_name = tcp
iface.initiatorname = <empty>
iface.state = <empty>
iface.vlan_id = 0
iface.vlan_priority = 0
iface.vlan_state = <empty>
iface.iface_num = 0
iface.mtu = 0
iface.port = 0
iface.bootproto = <empty>
iface.subnet_mask = <empty>
iface.gateway = <empty>
iface.dhcp_alt_client_id_state = <empty>
iface.dhcp_alt_client_id = <empty>
iface.dhcp_dns = <empty>
iface.dhcp_learn_iqn = <empty>
iface.dhcp_req_vendor_id_state = <empty>
iface.dhcp_vendor_id_state = <empty>
iface.dhcp_vendor_id = <empty>
iface.dhcp_slp_da = <empty>
iface.fragmentation = <empty>
iface.gratuitous_arp = <empty>
iface.incoming_forwarding = <empty>
iface.tos_state = <empty>
iface.tos = 0
iface.ttl = 0
iface.delayed_ack = <empty>
iface.tcp_nagle = <empty>
iface.tcp_wsf_state = <empty>
iface.tcp_wsf = 0
iface.tcp_timer_scale = 0
iface.tcp_timestamp = <empty>
iface.redirect = <empty>
iface.def_task_mgmt_timeout = 0
iface.header_digest = <empty>
iface.data_digest = <empty>
iface.immediate_data = <empty>
iface.initial_r2t = <empty>
iface.data_seq_inorder = <empty>
iface.data_pdu_inorder = <empty>
iface.erl = 0
iface.max_receive_data_len = 0
iface.first_burst_len = 0
iface.max_outstanding_r2t = 0
iface.max_burst_len = 0
iface.chap_auth = <empty>
iface.bidi_chap = <empty>
iface.strict_login_compliance = <empty>
iface.discovery_auth = <empty>
iface.discovery_logout = <empty>
node.discovery_address = 192.168.100.1
node.discovery_port = 3260
node.discovery_type = send_targets
node.session.initial_cmdsn = 0
node.session.initial_login_retry_max = 8
node.session.xmit_thread_priority = -20
node.session.cmds_max = 128
node.session.queue_depth = 32
node.session.nr_sessions = 1
node.session.auth.authmethod = CHAP
node.session.auth.username = username
node.session.auth.password = ********
node.session.auth.username_in = <empty>
node.session.auth.password_in = <empty>
node.session.timeo.replacement_timeout = 120
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 30
node.session.err_timeo.tgt_reset_timeout = 30
node.session.err_timeo.host_reset_timeout = 60
node.session.iscsi.FastAbort = Yes
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.session.iscsi.DefaultTime2Retain = 0
node.session.iscsi.DefaultTime2Wait = 2
node.session.iscsi.MaxConnections = 1
node.session.iscsi.MaxOutstandingR2T = 1
node.session.iscsi.ERL = 0
node.session.scan = auto
node.session.reopen_max = 0
node.conn[0].address = 192.168.100.1
node.conn[0].port = 3260
node.conn[0].startup = manual
node.conn[0].tcp.window_size = 524288
node.conn[0].tcp.type_of_service = 0
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.auth_timeout = 45
node.conn[0].timeo.noop_out_interval = 5
node.conn[0].timeo.noop_out_timeout = 5
node.conn[0].iscsi.MaxXmitDataSegmentLength = 0
node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144
node.conn[0].iscsi.HeaderDigest = None
node.conn[0].iscsi.DataDigest = None
node.conn[0].iscsi.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD

# zaloguj się do Target'u
[root@lsr02vm ~]# iscsiadm -m node --login
Logging in to [iface: default, target: iqn.2020-06.lab.zicher:lsr01vm.target01, portal: 192.168.100.1,3260]
Login to [iface: default, target: iqn.2020-06.lab.zicher:lsr01vm.target01, portal: 192.168.100.1,3260] successful.

# potwierdź stabilność sesji
[root@lsr02vm ~]# iscsiadm -m session -o show
tcp: [1] 192.168.100.1:3260,1 iqn.2020-06.lab.zicher:lsr01vm.target01 (non-flash)

# potwierdź partycje
[root@lsr02vm ~]# cat /proc/partitions
major minor #blocks name

8 0 8388608 sda
8 1 1048576 sda1
8 2 7339008 sda2
11 0 1048575 sr0
253 0 6496256 dm-0
253 1 839680 dm-1
8 16 1048576 sdb

# została dodana nowa partycja z Target'u jako [sdb]

[2] Po ustawieniu urządzenia iSCSI skonfiguruj Initiator w celu jego użycia.

# stwórz opis (label)
[root@lsr02vm ~]# parted --script /dev/sdb "mklabel gpt"

# stwórz partycję
[root@lsr02vm ~]# parted --script /dev/sdb "mkpart primary 0% 100%"

# sformatuj ją jako XFS
[root@lsr02vm ~]# mkfs.xfs -i size=512 -s size=1024 /dev/sdb1
meta-data=/dev/sdb1 isize=512 agcount=4, agsize=65534 blks
= sectsz=1024 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1
data = bsize=4096 blocks=262135, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =log wewnętrzny bsize=4096 blocks=1257, version=2
= sectsz=1024 sunit=1 blks, lazy-count=1
realtime =brak extsz=4096 blocks=0, rtextents=0

[root@lsr02vm ~]# mount /dev/sdb1 /mnt
[root@lsr02vm ~]# df -hT
System plików Typ rozm. użyte dost. %uż. zamont. na
devtmpfs devtmpfs 475M 0 475M 0% /dev
tmpfs tmpfs 491M 0 491M 0% /dev/shm
tmpfs tmpfs 491M 6,6M 485M 2% /run
tmpfs tmpfs 491M 0 491M 0% /sys/fs/cgroup
/dev/mapper/cl_lsr01vm-root xfs 6,2G 1,5G 4,7G 25% /
/dev/sda1 ext4 976M 153M 756M 17% /boot
/dev/sdb1 xfs 1020M 40M 980M 4% /mnt
tmpfs tmpfs 99M 0 99M 0% /run/user/0