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--- documentazione_3di_riservata:manuali_sysadmin:iscsi_multipath [2019/01/18 09:51] – epapakroni
+++ documentazione_3di_riservata:manuali_sysadmin:iscsi_multipath [Data sconosciuta] (versione attuale) – eliminata - modifica esterna (Data sconosciuta) 127.0.0.1
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-We will use Multipath for link HA and improved performance. Install the needed packages first:
-''root@proxmox01:~# apt-get install open-iscsi multipath-tools''
-''root@proxmox02:~# apt-get install open-iscsi multipath-tools''
-Then we discover the target and login on both proxmox nodes:
-''root@proxmox01:~# systemctl start open-iscsi.service''
-<code xml>root@proxmox01:~# iscsiadm -m discovery -t st -p 192.168.0.180
-.168.0.180:3260,1 iqn.2016-02.local.virtual:virtual.vg1
-.20.1.180:3260,1 iqn.2016-02.local.virtual:virtual.vg1
-root@proxmox01:~# iscsiadm -m node --login
-root@proxmox01:~# iscsiadm -m node
-.20.1.180:3260,1 iqn.2016-02.local.virtual:virtual.vg1
-.168.0.180:3260,1 iqn.2016-02.local.virtual:virtual.vg1
-root@proxmox02:~# iscsiadm -m session -P 1
-Target: iqn.2016-02.local.virtual:virtual.vg1 (non-flash)
-    Current Portal: 10.20.1.180:3260,1
-    Persistent Portal: 10.20.1.180:3260,1
-        **********
-        Interface:
-        **********
-        Iface Name: default
-        Iface Transport: tcp
-        Iface Initiatorname: iqn.1993-08.org.debian:01:674b46a9745
-        Iface IPaddress: 10.20.1.186
-        Iface HWaddress: <empty>
-        Iface Netdev: <empty>
-        SID: 1
-        iSCSI Connection State: LOGGED IN
-        iSCSI Session State: LOGGED_IN
-        Internal iscsid Session State: NO CHANGE
-    Current Portal: 192.168.0.180:3260,1
-    Persistent Portal: 192.168.0.180:3260,1
-        **********
-        Interface:
-        **********
-        Iface Name: default
-        Iface Transport: tcp
-        Iface Initiatorname: iqn.1993-08.org.debian:01:674b46a9745
-        Iface IPaddress: 192.168.0.186
-        Iface HWaddress: <empty>
-        Iface Netdev: <empty>
-        SID: 2
-        iSCSI Connection State: LOGGED IN
-        iSCSI Session State: LOGGED_IN
-        Internal iscsid Session State: NO CHANGE
-root@proxmox01:~# lsscsi
-[0:0:0:0]    cd/dvd  QEMU     QEMU DVD-ROM     1.4.  /dev/sr0
-[2:0:0:0]    disk    SCST_FIO VDISK-LUN01       311  /dev/sdb
-[3:0:0:0]    disk    SCST_FIO VDISK-LUN01       311  /dev/sda</code>
-We can see two new SCSI block devices have been introduced to the system, /dev/sda and /dev/sdb. Next is Multipathing setup. First we find the WWID of the new device:
-<code xml>root@proxmox01:~# /lib/udev/scsi_id -g -d /dev/sda
-23238363932313833
-root@proxmox01:~# /lib/udev/scsi_id -g -d /dev/sdb
-23238363932313833</code>
-that we then use in the Multipath config file /etc/multipath.conf that we create, for both proxmox nodes:
-<code xml>defaults {
-    user_friendly_names    yes
-        polling_interval        2
-        path_selector           "round-robin 0"
-        path_grouping_policy    multibus
-        path_checker            readsector0
-        getuid_callout          "/lib/udev/scsi_id -g -u -d /dev/%n"
-        rr_min_io               100
-        failback                immediate
-        no_path_retry           queue
-}
-blacklist {
-        wwid .*
-}
-blacklist_exceptions {
-        wwid "23238363932313833"
-    property "(ID_SCSI_VPD|ID_WWN|ID_SERIAL)"
-}
-multipaths {
-  multipath {
-        wwid "23238363932313833"
-        alias mylun
-  }
-}</code>
-and after loading Multipath kernel modules on both proxmox nodes:
-<code xml>root@proxmox02:~# modprobe -v dm_multipath
-insmod /lib/modules/4.2.6-1-pve/kernel/drivers/scsi/device_handler/scsi_dh.ko
-insmod /lib/modules/4.2.6-1-pve/kernel/drivers/md/dm-multipath.ko
-root@proxmox02:~# modprobe -v dm_round_robin
-insmod /lib/modules/4.2.6-1-pve/kernel/drivers/md/dm-round-robin.ko</code>
-and restarting Multipath service/daemon for both proxmox nodes:
-<code xml>root@proxmox01:~# systemctl stop multipath-tools.service
-root@proxmox01:~# systemctl start multipath-tools.service
-root@proxmox02:~# systemctl status -l multipath-tools.service
-   multipath-tools.service - LSB: multipath daemon
-   Loaded: loaded (/etc/init.d/multipath-tools)
-   Active: active (running) since Fri 2016-03-04 17:40:44 AEDT; 6s ago
-  Process: 8177 ExecStop=/etc/init.d/multipath-tools stop (code=exited, status=0/SUCCESS)
-  Process: 8191 ExecStart=/etc/init.d/multipath-tools start (code=exited, status=0/SUCCESS)
-   CGroup: /system.slice/multipath-tools.service
-           └─8195 /sbin/multipathd
-Mar 04 17:40:44 proxmox02 multipath-tools[8191]: Starting multipath daemon: multipathd.
-Mar 04 17:40:44 proxmox02 multipathd[8195]: sda: using deprecated getuid callout
-Mar 04 17:40:44 proxmox02 multipathd[8195]: sdb: using deprecated getuid callout
-Mar 04 17:40:44 proxmox02 multipathd[8195]: mylun: load table [0 41934848 multipath 1 queue_if_no_path 0 1 1 round-robin 0 2 1 8:0 1 8:16 1]
-Mar 04 17:40:44 proxmox02 multipathd[8195]: mylun: event checker started
-Mar 04 17:40:44 proxmox02 multipathd[8195]: path checkers start up </code>
-we can see the multipath device mylun created:
-<code xml>root@proxmox01:~# multipath -ll
-mylun (23238363932313833) dm-1 SCST_FIO,VDISK-LUN01
-size=20G features='1 queue_if_no_path' hwhandler='0' wp=rw
-`-+- policy='round-robin 0' prio=1 status=active
-  |- 2:0:0:0 sdb 8:16 active ready running
-  `- 3:0:0:0 sda 8:0  active ready running
-root@proxmox01:~# dmsetup ls
-pve-swap    (251:3)
-pve-root    (251:0)
-mylun    (251:1)
-pve-data    (251:4)
-vg_drbd0-vm--107--disk--1    (251:5)
-vg_proxmox-lv_proxmox    (251:2) </code>
-Next we create the volume group on one proxmox node only:
-''root@proxmox01:~# pvcreate /dev/mapper/mylun''
-''root@proxmox01:~# vgcreate vg_iscsi /dev/mapper/mylun''
-**Finally, using the PVE web GUI, we add new LVM storage using the newly created vg_iscsi volume group in the Datacenter and set it as Active and Shared.**
-{{:documentazione_3di_riservata:manuali_sysadmin:lvm.jpg?750|}}
-{{:documentazione_3di_riservata:manuali_sysadmin:yondu.jpg?600|}}
-At the end, in order to log in and establish the sessions to the iSCSI targets on reboot we set the startup mode to automatic in the iscsi initiator config file /etc/iscsi/iscsid.conf on both proxmox nodes:
-<code xml>[...]
-node.startup = automatic
-[...]</code>