On Fri, Jul 18, 2014 at 6:58 PM, Chris Friesen
<address@hidden> wrote:
Hi,
I've recently run up against an interesting issue where I had a number of
guests running and when I started doing heavy disk I/O on a virtio disk
(backed via ceph rbd) the memory consumption spiked and triggered the
OOM-killer.
I want to reserve some memory for I/O, but I don't know how much it can use
in the worst-case.
Is there a limit on the number of in-flight I/O operations? (Preferably as
a configurable option, but even hard-coded would be good to know as well.)
Thanks,
Chris
Hi, are you using per-vm cgroups or it was happened on bare system?
Ceph backend have writeback cache setting, may be you hitting it but
it must be set enormously large then.