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

[Raul Alonso]

Hello,



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¿?



Regards,

Raul.