Hello,
In our oVirt hosts, we are using DELL equallogic SAN with each server
connecting to SAN via 2 physical interfaces. Since both interfaces share the
same network (Equalogic limitation) we must patch the linux kernel to to allow
iSCSI multipath with multiple NICs in the same subnet with sysctl :
--------------------------------------------------------------------------------------------
net.ipv4.conf.p2p1.arp_ignore=1
net.ipv4.conf.p2p1.arp_announce=2
net.ipv4.conf.p2p1.rp_filter=2
net.ipv4.conf.p2p2.arp_ignore=1
net.ipv4.conf.p2p2.arp_announce=2
net.ipv4.conf.p2p2.rp_filter=2
--------------------------------------------------------------------------------------------
This works great in most setups, but for a strange reason, on some of our
setups, the sysctl configuration is updated by VDSM when activating a host and
the second interface stops working immeadiatly :
--------------------------------------------------------------------------------------------
vdsm.log
2017-06-07 11:51:51,063+0200 INFO (jsonrpc/5) [storage.ISCSI] Setting strict
mode rp_filter for device 'p2p2'. (iscsi:602)
2017-06-07 11:51:51,064+0200 ERROR (jsonrpc/5) [storage.HSM] Could not connect
to storageServer (hsm:2392)
Traceback (most recent call last):
File "/usr/share/vdsm/storage/hsm.py", line 2389, in connectStorageServer
conObj.connect()
File "/usr/share/vdsm/storage/storageServer.py", line 433, in connect
iscsi.addIscsiNode(self._iface, self._target, self._cred)
File "/usr/lib/python2.7/site-packages/vdsm/storage/iscsi.py", line 232, in
addIscsiNode
iscsiadm.node_login(iface.name, target.address, target.iqn)
File "/usr/lib/python2.7/site-packages/vdsm/storage/iscsiadm.py", line 337,
in node_login
raise IscsiNodeError(rc, out, err)
--------------------------------------------------------------------------------------------
"strict mode" is enforced for second interface, and it no longuer works...
Which means - at least - that there is no redundancy in case of hardware
faillure and this is not acceptable for our production needs.
What is really strange is that we have another "twin" site on another
geographic region with simillar hardware configuration and same oVirt
installation, and this problem does not happen.
What can be the root cause of this behaviour? How can I correct it?
our setup:
hostedEngine : Centor 7.3, ovirt 4.1.2
3 physical nodes centos 7.3, ovirt 4.1.2
SAN DELL Equalogic
cordialement, regards,
Nelson LAMEIRAS
Ingénieur Systèmes et Réseaux / Systems and Networks engineer
Tel: +33 5 32 09 09 70
[email protected]
www.lyra-network.com | www.payzen.eu
Lyra Network, 109 rue de l'innovation, 31670 Labège, FRANCE
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