Comment 13 for bug 1814595

Reviewed: https://review.openstack.org/642170
Committed: https://git.openstack.org/cgit/openstack/stx-config/commit/?id=77cbb985f294fbcb48c1a2946f2d63174588710e
Submitter: Zuul
Branch: master

commit 77cbb985f294fbcb48c1a2946f2d63174588710e
Author: Robert Church <email address hidden>
Date: Fri Mar 8 15:54:19 2019 -0500

    For stability bump size of rabbitmq PV to 1Gi

    The rabbitmq chart requests a 256Mi PV for operational storage. With
    CentOS 7.5 and 7.6 kernels, a jbd2 kernel thread hang is observed after
    a long soak period. Once this occurs, a host reboot is required to
    recover access to the PV.

    We have been able to reliably recreate this using the stock upstream
    CentOS 7.6 kernel and the latest Ceph Jewel LTS (10.2.11) version using
    fsstress. This is currently pointing to a race condition in the
    filesystem code.

    With a reliable test available for this, other scenarios to characterize
    this have been performed including using different volume sizes and
    using different ext4 filesystem formatting options.

    We've been unable to cause the hang using a 1Gi PV over an extended soak
    period so we'll update the stx-openstack manifest to request a 1Gi PV
    until the root cause and fix has been addressed in the kernel.

    Change-Id: Ia0e5b7ffb049c6e3cedfb4a6d3afda597eedb18a
    Related-Bug: #1814595
    Signed-off-by: Robert Church <email address hidden>