Public bug reported:
1. This bug is triggered will qualifying Canonical OpenStack(Mitaka) with EMC
XtremIO;
2. The Ubuntu server deployed through MAAS is Ubuntu 14.04.5 LTS;
3. multipath-tools 0.4.9-3ubuntu7.13 is used;
4. Below multipath.conf is used:
defaults {
verbosity 2
wwids_file /etc/multipath/wwids
user_friendly_names no
flush_on_last_del yes
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z]"
devnode "^dcssblk[0-9]*"
devnode "^cciss!c[0-9]d[0-9]*"
devnode "^nvme.*"
device {
vendor "DGC"
product "LUNZ"
}
device {
vendor "EMC"
product "LUNZ"
}
device {
vendor "IBM"
product "S/390.*"
}
device {
vendor "IBM"
product "S/390.*"
}
device {
vendor "STK"
product "Universal Xport"
}
}
blacklist_exceptions {
}
devices {
device {
vendor XtremIO
product XtremApp
path_selector "queue-length 0"
rr_min_io_rq 1
path_grouping_policy multibus
path_checker tur
failback immediate
fast_io_fail_tmo 15
}
... other array's device definition ...
}
multipaths {
}
5. XtremIO array paths can be managed successfully:
ubuntu@CA31:~$ sudo multipath -ll
3514f0c5e4c0002aa dm-3 XtremIO ,XtremApp
size=5.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 13:0:7:1 sdq 65:0 active ready running
|-+- policy='round-robin 0' prio=1 status=enabled
| `- 13:0:6:1 sdr 65:16 active ready running
|-+- policy='round-robin 0' prio=1 status=enabled
| `- 12:0:6:1 sdt 65:48 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
`- 12:0:7:1 sds 65:32 active ready running
6. Reproduce steps:
a. Launch a instance(cirros-0.3.4-x86_64-disk.img) with the help of OpenStack
dashboard;
b. Attach the volume seen in step 5 to the instance;
c. Format and mount the volume in the instance, then start IO;
d. Disable a FC port(2 x paths will be impacted) at the switch side;
e. After a while(30 ~ 60 seconds), the file system based on the volume in the
instance will become read only;
f. Restart the instance will clear the problem;
g. Based on the symptom, it seems multipath does not fail over IO of the
instance to alive paths in time.
7. Logs from the host and instance are attached to this bug.
** Affects: multipath-tools (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "multipath-tools.bug.tar.gz"
https://bugs.launchpad.net/bugs/1623311/+attachment/4740527/+files/multipath-tools.bug.tar.gz
** Summary changed:
- instance file system will become ready only after disabling a FC port
+ instance file system will become read only after disabling a FC port
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https://bugs.launchpad.net/bugs/1623311
Title:
instance file system will become read only after disabling a FC port
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