[gpfsug-discuss] rhel 7.1 systemd is un mounting gpfs file systems PMR 70339, 122, 000

[Kuei-Yu Wang-Knop]

It is appears to be a known problem that is fixed in GPFS 4.1.1.0, where
RHEL 7.1 has been tested with.

This is the detail on the issue:

   Problem: one systemd commit ff502445 is in RHEL7.1/SLES12 systemd,
    now new systemd will try to check the status of the BindsTo device.
    If the BindsTo device is inactive, systemd will fail the mount job
    and unmount the file system. Unfortunately, the mknod device will
    be always marked as inactive by systemd, and GPFS invokes mknod to
    create block device under /dev, so hit the unmount issue.

    Fix: Udev/systemd reads device info from kernel sysfs, while device
    created by mknod does not register in kernel, that is why, systemd
    fails to read the device info and device status keeps as inactive.
    Under new distros, a new tsctl setPseudoDisk command implemented,
    takes the role of mknod, will register the pseudo device for each
    GPFS file system in kernel sysfs before mounting, to make systemd
    happy.


------------------------------------
Kuei-Yu Wang-Knop
IBM Scalable I/O development
(845) 433-9333 T/L 293-9333, E-mail: kywang at us.ibm.com




From:	Matt Weil <mweil at genome.wustl.edu>
To:	gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:	11/30/2015 01:42 PM
Subject:	[gpfsug-discuss] rhel 7.1 systemd is un mounting gpfs file
            systems	PMR 70339, 122, 000
Sent by:	gpfsug-discuss-bounces at spectrumscale.org



Hello all,

Not sure if this is the a good place but we are experiencing a strange
issue.

It appears that systemd is un-mounting the file system immediately after
it is mounted.

#strace of systemd shows that the device is not there.  Systemd sees
that the path is failed and umounts the device.  Our only work around
currently is to link /usr/bin/umount to true.  Then the device stays
mounted.

1     stat("/dev/aggr3", {st_mode=S_IFBLK|0644, st_rdev=makedev(239,
235), ...}) = 0
1     readlink("/sys/dev/block/239:235", 0x7ffdb657a750, 1024) = -1
ENOENT (No such file or directory)
1     stat("/sys/dev/block/239:235", 0x7ffdb657a2c0) = -1 ENOENT (No
such file or directory)
1     socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 19

# It appears that the major min numbers have been changed
[root at gennsd4 system]# ls -l /sys/dev/block/|grep 239
lrwxrwxrwx 1 root root 0 Nov 19 15:04 253:239 ->
../../devices/virtual/block/dm-239
[root at gennsd4 system]#  ls -l /dev/aggr3
brw-r--r-- 1 root root 239, 235 Nov 19 15:06 /dev/aggr3
[root at gennsd4 system]# ls /sys/dev/block/239:235
ls: cannot access /sys/dev/block/239:235: No such file or directory

[root at gennsd4 system]# rpm -qa | grep gpfs
gpfs.gpl-4.1.0-7.noarch
gpfs.gskit-8.0.50-32.x86_64
gpfs.msg.en_US-4.1.0-7.noarch
gpfs.docs-4.1.0-7.noarch
gpfs.base-4.1.0-7.x86_64
gpfs.gplbin-3.10.0-229.14.1.el7.x86_64-4.1.0-7.x86_64
gpfs.ext-4.1.0-7.x86_64
[root at gennsd4 system]# rpm -qa | grep systemd
systemd-sysv-219-19.el7.x86_64
systemd-libs-219-19.el7.x86_64
systemd-219-19.el7.x86_64
systemd-python-219-19.el7.x86_64

any help would be appreciated.

Thanks

Matt

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