>>> Ferenc Wágner <wf...@niif.hu> schrieb am 30.08.2017 um 10:51 in Nachricht <87h8wpa16c.fsf...@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). Regards, Ulrich
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