<div dir="ltr">>> Can LVM cause these OOS?<br>
> Very unlikely.<div class="gmail_extra"><br></div><div class="gmail_extra">I have another idea here. I'll try to switch drive options for KVM from cache=none to cache=directsync or cache=writethrough. In that case KVM has to ensure that data is on disk. I suppose this means (with disk-flushes and disk-barrier disabled) that KVM will ensure data being written to DRBD layer and DRBD will ensure it is in RAID cache.<br>
<br></div><div class="gmail_extra">Will come back with results in 2-3 weeks.<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Stanislav<br></div></div>