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This is an old revision of the document!

Storage

Storage types

  • Network storage
    • LVM Group on iSCSI
      • can be shared
    • ZFS over iSCSI
      • thin provisioning
    • iSCSI target / iSCSI direct (user-level library libiscsi2)
    • NFS
    • Ceph RDB
    • GlusterFS
  • Local storage
    • LVM Group overy any block device
      • LVM Thin pools: only on LOCAL - cannot be shared!
    • Directory (storage on existing FS)
    • ZFS

Content types

  • tbd

Local storage

  • Backups - /var/lib/vz/dump
  • ISOs - /var/lib/vz/template/iso
  • Images - /var/lib/vz/images
  • Templates - /var/lib/vz/template/cache

iSCSI

Proxmox doc recommends: 

iSCSI is a block level type storage, and provides no management interface. So it is usually best to export one big LUN, and setup LVM on top of that LUN. You can then use the LVM plugin to manage the storage on that iSCSI LUN.

iSCSI target/direct is capable to store only following content types

  • images
  • none

Use LUNs directly - use directly as VM disk without putting LVM volume on it

NAS326 CHAP issue

NAS326 requires CHAP authentication and initiator user name. There are 2 options to use NAS326:

  • disable CHAP on NAS326
  • enable CHAP on Proxmox

Proxmox initiator name can be found in file: /etc/iscsi/initiatorname.iscsi

disable CHAP on NAS326

  • create the LUN(s) and target via the webgui
  • login to your zyxel via ssh as root
  • targetcli (this will open a shell where you can manage iscsi, use tab completion to get around in it)
  • ls (to get an overview)
  • cd /iscsi/iqn.2018-03.com.zyxel:targetname.randomstring/tpg1/ (again use tab completion, so cd /iscsi/iqn<tab><tab<tab<tab> etc. etc.)
  • set attribute authentication=0
  • set attribute generate_node_acls=1
  • set attribute demo_mode_write_protect=0
  • I also deleted the ACLS by doing; cd acls, delete iqn<tab><tab>
  • exit
  • targetcli saveconfig (normally if you exit targetcli, it will autosave, so this is just in case)

use CHAP on Proxmox

Logout and remove all failed trials to connect to NAS326. Especially if IPv6 was enabled on NAS326, proxmox detect two send_targets: one for IPv4 and one for IPv6 (not reachable). After disabling IPv6 on NAS326, please restart 

ls /etc/iscsi/nodes
 
# logout
iscsiadm -m node -u -T "iqn.2020-04.com.zyxel:nas326-iscsi-pve1-isos-target.tjlintux" --portal 192.168.28.150
iscsiadm -m node -u -T "iqn.2020-04.com.zyxel:nas326-iscsi-pve1-isos-target.tjlintux" --portal fd57::be99:11ff:fe06:18b0
# remove
iscsiadm -m node -o delete -T "iqn.2020-04.com.zyxel:nas326-iscsi-pve1-isos-target.tjlintux" --portal 192.168.28.150
iscsiadm -m node -o delete -T "iqn.2020-04.com.zyxel:nas326-iscsi-pve1-isos-target.tjlintux" --portal fd57::be99:11ff:fe06:18b0

Uncomment and set following config lines:

| /etc/iscsi/iscsid.conf
node.session.auth.authmethod = CHAP
# get initiator name from /etc/iscsi/initiatorname.iscsi
node.session.auth.username = iqn.1993-08.org.debian:01:4dad9d97a329
node.session.auth.password = my_chap_password_for_NAS326

iscsiadm -m discovery -t sendtargets -p 192.168.28.150

iscsiadm -m node -o show

iscsiadm -m node –login

cat /proc/partitions

iSCSI+LVM supports HA and Live Migration of VMs –> mark LVM storage as shared