Hi,
are you using ovirt storage leases? You'll need them if you want to
handle a hypervisor completely unresponsive (including fencing actions)
in a HA setting. Those storage leases use sanlock. If you use sanlock a
VM gets killed if the lease is not renewable during a very short
timeframe (60 seconds). That is what is killing the VMs during takeover.
Before storage leases it seems to have worked because it would simply
wait long enough for nfs to finish.
Greetings
Klaas
On 18.04.19 12:47, Ladislav Humenik wrote:
Hi, we have netapp nfs with ovirt in production and never experienced
an outage during takeover/giveback ..
- the default ovirt mount options should also handle little NFS
timeout
(rw,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,soft,nolock,nosharecache,proto=tcp,timeo=600,retrans=6,sec=sys)
- but to tune it little up you should set disk timeout inside your
guest VMs to at least 180 and than you are safe
example:
|cat << EOF >>/etc/rc.d/rc.local # Increasing the timeout value for i
in /sys/class/scsi_generic/*/device/timeout; do echo 180 > "\$i"; done
EOF |
KR
On 18.04.19 10:45, klaasdem...@gmail.com wrote:
Hi,
I got a question regarding oVirt and the support of NetApp NFS
storage. We have a MetroCluster for our virtual machine disks but a
HA-Failover of that (active IP gets assigned to another node) seems
to produce outages too long for sanlock to handle - that affects all
VMs that have storage leases. NetApp says a "worst case" takeover
time is 120 seconds. That would mean sanlock has already killed all
VMs. Is anyone familiar with how we could setup oVirt to allow such
storage outages? Do I need to use another type of storage for my
oVirt VMs because that NFS implementation is unsuitable for oVirt?
Greetings
Klaas
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--
Ladislav Humenik
System administrator / VI
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