[PVE-User] IO delay 3-5% VMs freezed

Raul Alonso raul.alonso at tpartner.net
Thu Nov 8 10:31:20 CET 2018



I have a 3 nodes cluster PVE versión: pve-manager/5.1-41/0b958203 (running
kernel: 4.13.13-2-pve)  with ceph.

Each node 2x 300GB SAS (Raid 1) for system and 3 x 600GB SAS 15krpm for
ceph, the ceph has been created on a 10GB network card.

OSD config are:

            osd journal size = 5120

            osd pool default min size = 2

            osd pool default size = 3


We are observing sometime the IO delay goes up to 3-5%, in these cases the
VMs are blocked for a few seconds.

Any idea why these IO rises and VM blocking¿?




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