Public bug reported:
[Impact]
* Every ceph-volume list lvm <device> call invokes blkid for numerous
PARTUUIDs. For some setups with many slower IO devices this can make this call
to run for minutes without any actual justification for that.
In fact, the upstream ceph approach changed in this matter and post-bionic
releases already have ceph-volume that does not invoke blkid at all in this
context making the call much faster.
Please examine the attached ceph-volume.log fragment for a ceph-volume
call, the accumulated blkid calls take around 1 min 7 s.
[Test Case]
* Setup a ceph-osd with numerous block devices with long access time for blkid.
* Run
time ceph-volume --log-path ceph-volume.log --log-level debug lvm list <device>
on one of them and check the log to see that most of the execution time is
consumed by blkid calls.
[Where problems could occur]
* Although a potential fix does not introduce any changes to how ceph-
volume is used any automation depending on ceph-volume log parsing may
notice a change.
[Other Info]
* The fix to this is available for Focal and beyond.
* Xenial is not affected due to lack of ceph-volume in its ceph release.
** Affects: ceph (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: ceph (Ubuntu Bionic)
Importance: Medium
Assignee: Dariusz Gadomski (dgadomski)
Status: In Progress
** Tags: sts
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1908375
Title:
ceph-volume lvm list <device> calls blkid numerous times for
differrent devices
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/1908375/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
