think you very much,but virsh pool still can't startup,below is the major
step.
1.virsh pool-define-as --name whxg-mail --type iscsi --source-host
172.18.133.210 --source-dev
iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail --target /dev/disk/by-path
2.virsh pool-dumpxml whxg-mail
<pool type='iscsi'>
<name>whxg-mail</name>
<uuid>0cbe0cf1-6f5a-63de-0747-1a3f929bb5d8</uuid>
<capacity unit='bytes'>0</capacity>
<allocation unit='bytes'>0</allocation>
<available unit='bytes'>0</available>
<source>
<host name='172.18.133.210'/>
<device path='iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail'/>
</source>
<target>
<path>/dev/disk/by-path</path>
<permissions>
<mode>0755</mode>
<owner>-1</owner>
<group>-1</group>
</permissions>
</target>
</pool>
3.virsh pool-start whxg-mail
error: Failed to start pool whxg-mail
error: internal error cannot find session
4.tail -100 /var/log/message
Mar 31 09:38:12 whxgftz kernel: scsi186 : iSCSI Initiator over TCP/IP
Mar 31 09:38:12 whxgftz kernel: scsi 186:0:0:0: Direct-Access SYNOLOGY
iSCSI Storage 3.1 PQ: 0 ANSI: 5
Mar 31 09:38:12 whxgftz kernel: sd 186:0:0:0: Attached scsi generic sg2
type 0
Mar 31 09:38:12 whxgftz kernel: sd 186:0:0:0: [sdb] 1048576000 512-byte
logical blocks: (536 GB/500 GiB)
Mar 31 09:38:12 whxgftz kernel: sd 186:0:0:0: [sdb] Write Protect is off
Mar 31 09:38:12 whxgftz kernel: sd 186:0:0:0: [sdb] Write cache: disabled,
read cache: enabled, doesn't support DPO or FUA
Mar 31 09:38:12 whxgftz udevd-work[7769]: setfilecon /dev/bsg/186:0:0:0
failed: No such file or directory
Mar 31 09:38:12 whxgftz kernel: Dev sdb: unable to read RDB block 0
Mar 31 09:38:12 whxgftz kernel: sdb: unable to read partition table
Mar 31 09:38:12 whxgftz kernel: sd 186:0:0:0: [sdb] Attached SCSI disk
Mar 31 09:38:12 whxgftz udevd-work[7251]: error opening
ATTR{/sys/devices/platform/host186/session181/target186:0:0/186:0:0:0/block/sdb/queue/iosched/slice_idle}
for writing: No such file or directory
Mar 31 09:38:12 whxgftz udevd-work[7251]: error opening
ATTR{/sys/devices/platform/host186/session181/target186:0:0/186:0:0:0/block/sdb/queue/iosched/quantum}
for writing: No such file or directory
Mar 31 09:38:12 whxgftz iscsid: Connection181:0 to [target:
iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail, portal:
172.18.133.210,3260] through [iface: default] is operational now
Mar 31 09:38:12 whxgftz kernel: connection181:0: detected conn error (1020)
Mar 31 09:38:13 whxgftz iscsid: Connection181:0 to [target:
iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail, portal:
172.18.133.210,3260] through [iface: default] is shutdown.
5. iscsiadm -m node -T iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail
# BEGIN RECORD 6.2.0-873.10.el6
node.name = iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail
node.tpgt = 0
node.startup = automatic
node.leading_login = No
iface.hwaddress = <empty>
iface.ipaddress = <empty>
iface.iscsi_ifacename = default
iface.net_ifacename = <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 = 172.18.133.210
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 = None
node.session.auth.username = <empty>
node.session.auth.password = <empty>
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.conn[0].address = 172.18.133.218
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.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD
# BEGIN RECORD 6.2.0-873.10.el6
node.name = iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail
node.tpgt = 0
node.startup = manual
node.leading_login = No
iface.hwaddress = <empty>
iface.ipaddress = <empty>
iface.iscsi_ifacename = default
iface.net_ifacename = <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 = 172.18.133.210
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 = None
node.session.auth.username = <empty>
node.session.auth.password = <empty>
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.conn[0].address = 172.18.133.210
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.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD
even I adjust startup method as follow and then start pool,problem still
exit.
1.iscsiadm -m node -o update -n node.startup -v manual -T
iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail -p 172.18.133.218
2.iscsiadm -m node -o update -n node.startup -v automatic -T
iqn.2010-10.synology-iscsi:virtualdisk.whxg-mail -p 172.18.133.210
3.virsh pool-start whxg-mail
after pool start whxg-mail,system will automatic change portal
172.18.133.218 startup as automatic,and 172.18.133.210 startup as manual.
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