[ClusterLabs] Antw: Re: Strange Corosync (TOTEM) logs, Pacemaker OK but DLM stuck

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Wed Aug 30 06:35:42 EDT 2017

>>> Ferenc Wágner <wferi at niif.hu> schrieb am 30.08.2017 um 10:51 in Nachricht
<87h8wpa16c.fsf_-_ at lant.ki.iif.hu>:

> Do you mean the LVM metadata read latency as seen by the LVM tools or
> that of a mirrored data region?

Actually I monitor all of these:
(on the VM host)
* the Multpath devices for the SAN storage that provide the PVs
* the mirrored LV that provides VM storage
* the mirror logs of the LV
* the OCFS2 filesystem that hosts the VM files and devices
(on the VM guest)
* the virtual physical disk"
* the fileystem on top of it

An amazing side note: For comparison I monitor NFS latency in a VM-based
NFS-client where the server is physical, and the delays are a lot more constant
than for the virtual local disks (see attachment).


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