Bug 224014

Summary: ctld: duplicate serials and lun-id
Product: Base System Reporter: emz
Component: kernAssignee: Edward Tomasz Napierala <trasz>
Status: New ---    
Severity: Affects Only Me CC: asomers, trasz
Priority: ---    
Version: 11.0-STABLE   
Hardware: Any   
OS: Any   

Description emz 2017-12-01 09:07:49 UTC 
Env:
====
FreeBSD san.dev.enaza.ru 11.0-STABLE FreeBSD 11.0-STABLE #0 r315957: Wed Nov  1 15:14:39 +05 2017     emz@san.dev.enaza.ru:/usr/obj/usr/src/sys/GENERIC  amd64



ctld is often assigning duplicate serials and lun-id on luns after ctladm remove has been issued. This leads to confusion on initiators.

I'm not sure if it's a bug from the iSCSI protocol point of view, but from user side it definitely is.

# ctladm devlist -v
LUN Backend       Size (Blocks)   BS Serial Number    Device ID       
  1 block            6442450944  512 MYSERIAL   1     MYDEVID   1     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/games-ver5_27-worker01
      ctld_name=iqn.2016-04.net.playkey.iscsi:games-worker01,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:games-worker01,lun,0
  2 block            6442450944  512 MYSERIAL   2     MYDEVID   2     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/games-ver5_27-worker02
      ctld_name=iqn.2016-04.net.playkey.iscsi:games-worker02,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:games-worker02,lun,0
  3 block            6442450944  512 MYSERIAL   3     MYDEVID   3     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/games-ver5_27-worker03
      ctld_name=iqn.2016-04.net.playkey.iscsi:games-worker03,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:games-worker03,lun,0
  4 block            6442450944  512 MYSERIAL   4     MYDEVID   4     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/games-ver5_27-worker04
      ctld_name=iqn.2016-04.net.playkey.iscsi:games-worker04,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:games-worker04,lun,0
  5 block            6442450944  512 MYSERIAL   5     MYDEVID   5     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/games-ver12_2-worker05
      ctld_name=iqn.2016-04.net.playkey.iscsi:games-worker05,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:games-worker05,lun,0
  7 block             104857600  512 MYSERIAL   7     MYDEVID   7     
      lun_type=0
      num_threads=14
      scsiname=userdata1
      file=/dev/zvol/data/userdata1
      ctld_name=iqn.2016-04.net.playkey.iscsi:userdata1,lun,0
  8 block             104857600  512 MYSERIAL   8     MYDEVID   8     
      lun_type=0
      num_threads=14
      scsiname=userdata2
      file=/dev/zvol/data/userdata2
      ctld_name=iqn.2016-04.net.playkey.iscsi:userdata2,lun,0
  9 block                  2048  512 MYSERIAL   9     MYDEVID   9     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/foobar
      ctld_name=iqn.2016-04.net.playkey.iscsi:foobar,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:foobar,lun,0
 10 block             104857600  512 MYSERIAL  10     MYDEVID  10     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/kvm/guest1
      ctld_name=iqn.2016-04.net.playkey.iscsi:guest1,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:guest1,lun,0
 11 block             104857600  512 MYSERIAL  11     MYDEVID  11     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/kvm/guest2
      ctld_name=iqn.2016-04.net.playkey.iscsi:guest2,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:guest2,lun,0
 12 block             104857600  512 MYSERIAL  12     MYDEVID  12     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/kvm/guest3
      ctld_name=iqn.2016-04.net.playkey.iscsi:guest3,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:guest3,lun,0
  0 block            6442450944  512 MYSERIAL  11     MYDEVID  11     
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/games
      ctld_name=iqn.2016-04.net.playkey.iscsi:games,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:games,lun,0
 15 block             104857600  512 MYSERIAL  12     guest4          
      lun_type=0
      num_threads=14
      file=/dev/zvol/dataflash/kvm/guest4
      ctld_name=iqn.2016-04.net.playkey.iscsi:guest4,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:guest4,lun,0
Comment 1 Alan Somers freebsd_committer freebsd_triage 2021-05-21 19:29:09 UTC 
This is probably not a bug.  I don't think there's anything in the SCSI model that requires every device to have a unique and persistent serial number.  However, VMWare ESX assumes otherwise.  So it would be a useful enhancement if ctld could generate unique serial numbers for every LUN.  VMWare will refuse to use two different iSCSI LUNs that share the same serial number.

https://www.reddit.com/r/freenas/comments/k3n33p/vmware_users_beware_this_iscsi_lun_bug_causing/