Fernando
On 17/04/2017 10:06, Nir Soffer wrote:
On Mon, Apr 17, 2017 at 8:24 AM Konstantin Raskoshnyi
<[email protected] <mailto:[email protected]>> wrote:
But actually, it didn't work well. After main SPM host went down I
see this
Screen Shot 2017-04-16 at 10.22.00 PM.png
2017-04-17 05:23:15,554Z ERROR
[org.ovirt.engine.core.vdsbroker.irsbroker.IrsProxy]
(DefaultQuartzScheduler5) [4dcc033d-26bf-49bb-bfaa-03a970dbbec1]
SPM Init: could not find reported vds or not up - pool: 'STG'
vds_spm_id: '1'
2017-04-17 05:23:15,567Z INFO
[org.ovirt.engine.core.vdsbroker.irsbroker.IrsProxy]
(DefaultQuartzScheduler5) [4dcc033d-26bf-49bb-bfaa-03a970dbbec1]
SPM selection - vds seems as spm 'tank5'
2017-04-17 05:23:15,567Z WARN
[org.ovirt.engine.core.vdsbroker.irsbroker.IrsProxy]
(DefaultQuartzScheduler5) [4dcc033d-26bf-49bb-bfaa-03a970dbbec1]
spm vds is non responsive, stopping spm selection.
So that means only if BMC is up it's possible to automatically
switch SPM host?
BMC?
If your SPM is no responsive, the system will try to fence it. Did you
configure power management for all hosts? did you check that it
work? How did you simulate non-responsive host?
If power management is not configured or fail, the system cannot
move the spm to another host, unless you manually confirm that the
SPM host was rebooted.
Nir
Thanks
On Sun, Apr 16, 2017 at 8:29 PM, Konstantin Raskoshnyi
<[email protected] <mailto:[email protected]>> wrote:
Oh, fence agent works fine if I select ilo4,
Thank you for your help!
On Sun, Apr 16, 2017 at 8:22 PM Dan Yasny <[email protected]
<mailto:[email protected]>> wrote:
On Sun, Apr 16, 2017 at 11:19 PM, Konstantin Raskoshnyi
<[email protected] <mailto:[email protected]>> wrote:
Makes sense.
I was trying to set it up, but doesn't work with our
staging hardware.
We have old ilo100, I'll try again.
Thanks!
It is absolutely necessary for any HA to work properly.
There's of course the "confirm host has been shutdown"
option, which serves as an override for the fence command,
but it's manual
On Sun, Apr 16, 2017 at 8:18 PM Dan Yasny
<[email protected] <mailto:[email protected]>> wrote:
On Sun, Apr 16, 2017 at 11:15 PM, Konstantin
Raskoshnyi <[email protected]
<mailto:[email protected]>> wrote:
Fence agent under each node?
When you configure a host, there's the power
management tab, where you need to enter the bmc
details for the host. If you don't have fencing
enabled, how do you expect the system to make sure
a host running a service is actually down (and it
is safe to start HA services elsewhere), and not,
for example, just unreachable by the engine? How
do you avoid a splitbraid -> SBA ?
On Sun, Apr 16, 2017 at 8:14 PM Dan Yasny
<[email protected] <mailto:[email protected]>>
wrote:
On Sun, Apr 16, 2017 at 11:13 PM,
Konstantin Raskoshnyi <[email protected]
<mailto:[email protected]>> wrote:
"Corner cases"?
I tried to simulate crash of SPM
server and ovirt kept trying to
reistablished connection to the failed
node.
Did you configure fencing?
On Sun, Apr 16, 2017 at 8:10 PM Dan
Yasny <[email protected]
<mailto:[email protected]>> wrote:
On Sun, Apr 16, 2017 at 7:29 AM,
Nir Soffer <[email protected]
<mailto:[email protected]>> wrote:
On Sun, Apr 16, 2017 at 2:05
PM Dan Yasny
<[email protected]
<mailto:[email protected]>> wrote:
On Apr 16, 2017 7:01 AM,
"Nir Soffer"
<[email protected]
<mailto:[email protected]>>
wrote:
On Sun, Apr 16, 2017
at 4:17 AM Dan Yasny
<[email protected]
<mailto:[email protected]>>
wrote:
When you set up a
storage domain,
you need to
specify a host to
perform the
initial storage
operations, but
once the SD is
defined, it's
details are in the
engine database,
and all the hosts
get connected to
it directly. If
the first host you
used to define the
SD goes down, all
other hosts will
still remain
connected and
work. SPM is an HA
service, and if
the current SPM
host goes down,
SPM gets started
on another host in
the DC. In short,
unless your actual
NFS exporting host
goes down, there
is no outage.
There is no storage
outage, but if you
shutdown the spm host,
the spm host
will not move to a new
host until the spm
host is online again,
or you confirm
manually that the spm
host was rebooted.
In a properly configured
setup the SBA should take
care of that. That's the
whole point of HA services
In some cases like power loss
or hardware failure, there is
no way to start
the spm host, and the system
cannot recover automatically.
There are always corner cases, no
doubt. But in a normal situation.
where an SPM host goes down
because of a hardware failure, it
gets fenced, other hosts contend
for SPM and start it. No surprises
there.
Nir
Nir
On Sat, Apr 15,
2017 at 1:53 PM,
Konstantin
Raskoshnyi
<[email protected]
<mailto:[email protected]>>
wrote:
Hi Fernando,
I see each
host has
direct
connection nfs
mount, but
yes, if main
host to which
I connected
nfs storage
going down the
storage
becomes
unavailable
and all vms
are down
On Sat, Apr
15, 2017 at
10:37 AM
FERNANDO
FREDIANI
<[email protected]
<mailto:[email protected]>>
wrote:
Hello
Konstantin.
That
doesn`t
make much
sense make
a whole
cluster
depend on
a single
host. From
what I
know any
host talk
directly
to NFS
Storage
Array or
whatever
other
Shared
Storage
you have.
Have you
tested
that host
going down
if that
affects
the other
with the
NFS
mounted
directlly
in a NFS
Storage
array ?
Fernando
2017-04-15
12:42
GMT-03:00
Konstantin
Raskoshnyi
<[email protected]
<mailto:[email protected]>>:
In
ovirt
you
have
to
attach
storage
through
specific
host.
If
host
goes
down
storage
is not
available.
On
Sat,
Apr
15,
2017
at
7:31
AM
FERNANDO
FREDIANI
<[email protected]
<mailto:[email protected]>>
wrote:
Well,
make
it
not
go
through
host1
and
dedicate
a
storage
server
for
running
NFS
and
make
both
hosts
connect
to it.
In
my
view
NFS
is
much
easier
to
manage
than
any
other
type
of
storage,
specially
FC
and
iSCSI
and
performance
is
pretty
much
the
same,
so
you
won`t
get
better
results
other
than
management
going
to
other
type.
Fernando
2017-04-15
5:25
GMT-03:00
Konstantin
Raskoshnyi
<[email protected]
<mailto:[email protected]>>:
Hi
guys,
I
have
one
nfs
storage,
it's
connected
through
host1.
host2
also
has
access
to
it,
I
can
easily
migrate
vms
between
them.
The
question
is
-
if
host1
is
down
-
all
infrastructure
is
down,
since
all
traffic
goes
through
host1,
is
there
any
way
in
oVirt
to
use
redundant
storage?
Only
glusterfs?
Thanks
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