------- Comment From [email protected] 2016-11-28 09:37 EDT-------
I found something new today. Just for your reference.

When the deployment gets failure. I can see below info in the syslog.  It shows 
io_setup failed from multipathd.
Nov 27 22:24:31 ub01 kernel: [561221.664513] scsi host153: iSCSI Initiator over 
TCP/IP
Nov 27 22:24:32 ub01 kernel: [561222.677294] scsi 153:0:0:0: RAID              
IET      Controller       0001 PQ: 0 ANSI: 5
Nov 27 22:24:32 ub01 kernel: [561222.677684] scsi 153:0:0:0: Attached scsi 
generic sg142 type 12
Nov 27 22:24:32 ub01 kernel: [561222.678596] scsi 153:0:0:1: Direct-Access     
IET      VIRTUAL-DISK     0001 PQ: 0 ANSI: 5
Nov 27 22:24:32 ub01 kernel: [561222.679067] sd 153:0:0:1: Attached scsi 
generic sg143 type 0
Nov 27 22:24:32 ub01 kernel: [561222.679105] sd 153:0:0:1: [sdcm] 41943040 
512-byte logical blocks: (21.5 GB/20.0 GiB)
Nov 27 22:24:32 ub01 kernel: [561222.679305] sd 153:0:0:1: [sdcm] Write Protect 
is off
Nov 27 22:24:32 ub01 kernel: [561222.679308] sd 153:0:0:1: [sdcm] Mode Sense: 
69 00 10 08
Nov 27 22:24:32 ub01 kernel: [561222.679393] sd 153:0:0:1: [sdcm] Write cache: 
enabled, read cache: enabled, supports DPO and FUA
Nov 27 22:24:32 ub01 kernel: [561222.680868]  sdcm: sdcm1
Nov 27 22:24:32 ub01 kernel: [561222.681803] sd 153:0:0:1: [sdcm] Attached SCSI 
disk
Nov 27 22:24:32 ub01 multipathd[179286]: sdcm: add path (uevent)
Nov 27 22:24:32 ub01 multipathd[179286]: io_setup failed
Nov 27 22:24:32 ub01 multipathd[179286]: uevent trigger error
Nov 27 22:24:32 ub01 systemd-udevd[251528]: Could not generate persistent MAC 
address for qbrb21abf90-f6: No such file or directory
Nov 27 22:24:33 ub01 systemd-udevd[251596]: Could not generate persistent MAC 
address for qvob21abf90-f6: No such file or directory
Nov 27 22:24:33 ub01 systemd-udevd[251597]: Could not generate persistent MAC 
address for qvbb21abf90-f6: No such file or directory
Nov 27 22:24:33 ub01 iscsid: Connection150:0 to [target: 
iqn.2010-10.org.openstack:volume-54921f21-d2e1-49d6-a39c-4c21c458750b, portal: 
148.100.42.50,3260] through [iface: default] is operational now
Nov 27 22:24:33 ub01 kernel: [561223.395321] IPv6: ADDRCONF(NETDEV_UP): 
qvbb21abf90-f6: link is not ready
Nov 27 22:24:33 ub01 kernel: [561223.465740] device qvbb21abf90-f6 entered 
promiscuous mode
Nov 27 22:24:33 ub01 kernel: [561223.613720] IPv6: ADDRCONF(NETDEV_CHANGE): 
qvbb21abf90-f6: link becomes ready
Nov 27 22:24:33 ub01 kernel: [561223.687587] device qvob21abf90-f6 entered 
promiscuous mode
Nov 27 22:24:33 ub01 kernel: [561223.919008] qbrb21abf90-f6: port 
1(qvbb21abf90-f6) entered forwarding state
Nov 27 22:24:33 ub01 kernel: [561223.919014] qbrb21abf90-f6: port 
1(qvbb21abf90-f6) entered forwarding state
Nov 27 22:24:33 ub01 ovs-vsctl: ovs|00001|vsctl|INFO|Called as 
/usr/bin/ovs-vsctl --timeout=120 -- --if-exists del-port qvob21abf90-f6 -- 
add-port br-int qvob21abf90-f6 -- set Interface qvob21abf90-f6 
external-ids:iface-id=b21abf90-f649-4501-ae8f-f0fffa44090b 
external-ids:iface-status=active external-ids:attached-mac=fa:16:3e:5d:f3:1d 
external-ids:vm-uuid=fc797a01-9f8d-4bbd-bd93-c14eb14b880b

And from the multipath -ll output. I see some below messages.

Nov 28 09:20:41 | io_setup failed
Nov 28 09:20:41 | io_setup failed
Nov 28 09:20:41 | io_setup failed
Nov 28 09:20:41 | io_setup failed
Nov 28 09:20:41 | io_setup failed
Nov 28 09:20:41 | io_setup failed
.....
....
mpathr (36005076306ffd700000000000000010d) dm-7 IBM,2107900
size=100G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 3:0:0:1074610177 sdd  8:48   active ready  running
`- 0:0:1:1074610177 sdab 65:176 active ready  running
.....

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Title:
  Ubuntu Openstack Mitaka can only deploy up to 52 instances

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