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snapmirror multi interfaces not available in PM

Hi,

I received a question from a customer using Protection Manager DR. He used to configure snapmirror manually, using multipath/failover interface specifications in /etc/snapmirror.conf.

The problem is that PM does not seem to allow the use or creation of aggregated network links as snapmirror.conf does.

Is it still a PM limitation, or is there some workaround?

Thanks in advance

Pierre

Re: snapmirror multi interfaces not available in PM

Hi Pierre,

     No.Its not a limitation of PM.

Use the "hostPreferredAddr1" "hostPreferredAddr2" in the dfm host set command for creating preferred connection

for snapmirror.relatinships.

lnx186-101: # dfm host set
Valid options are
  hostLogin                 Login
  hostPassword              Password
  hostLoginProtocol         Login Protocol
  hostPreferredAddr1        Preferred IP address 1
  hostPreferredAddr2        Preferred IP address 2
  hostPrimaryAddress        Primary IP Address
  hostRLMAddress            Remote Platform Management IP Address
  hostConsoleAddress        Console Terminal Server Address
  cpuTooBusyThreshold       Host CPU Too Busy Threshold (%)
  cpuBusyThresholdInterval  Host CPU Busy Threshold Interval
  hostPingMethod            Ping Method
  hostAdminTransport        Administration Transport
  hostNdmpLogin             NDMP Login
  hostNdmpPassword          NDMP Password
  hostAdminPort             Administration Port
  hbaportTooBusyThreshold   HBA Port Too Busy Threshold (%)
  hostAgentCIFSAccount      Agent CIFS Account
  hostAgentCIFSPassword     Agent CIFS Password
  perfAdvisorTransport      Performance Advisor Transport
  prefsnmpVersion           Preferred SNMP Version
  useHostsEquiv             Hosts.equiv Enabled
  maxActiveDataTransfers    Maximum Active Data Transfers
  perfDataExportEnabled     Performance Advisor Data Export Enabled
  perfAdvisorDisabledCounterGroups Perf Advisor Disabled Counter Groups
  defaultvFilerInterface    Host vFiler Default Interface
  processHostIP             Primary IP Address Inconsistency Action
lnx186-101: #

Re: snapmirror multi interfaces not available in PM

Thanks a lot, I will test your solution and let you know.

Kind regards

Pierre

Re: snapmirror multi interfaces not available in PM

adai,

If you were to set hostPreferredAddr1 & hostPreferredAddr2 for a PM host, would PM define a muliplex or failover SnapMirror relationship?  I don't see anywhere to specifty this in the host options.

Re: snapmirror multi interfaces not available in PM

Hi Reide,


AFAIK, It's a failover based logic. You can check the following link for more details:


https://now.netapp.com/NOW/knowledge/docs/DFM_win/rel40/html/faq/index.shtml#_16.8


Thanks and regards

Shiva Raja

Re: snapmirror multi interfaces not available in PM

Sorry Shiva, to my experience and knowledge it's multi not failover.

Re: snapmirror multi interfaces not available in PM

Hi there,

Are you saying that Protection manager would use both interfaces at the same time for a SM transfer?

Thanks and regards

Shiva Raja


Re: snapmirror multi interfaces not available in PM

Yes.

In our environment we wanted to move all the data over a dedicated vlan so used this feature of DFM. We have set that IP in DFM settings however looking at snapmirror.conf shows that PM used that single IP with multi option to make connection entry.

Don't know why it thinks that with single IP it can create a failover or multiplexing connection but unfortunately that's the reality, hopefully Adai can shed some light on it.

Re: snapmirror multi interfaces not available in PM

Hi there,

Have you tried specifying both HostpreferredAddr1 and HostpreferredAddr2? If for some reason PM is not able to transfer through HostpreferredAddr1, then it would use HostpreferredAddr2. That’s what I meant in my previous post.

Now coming to your point. Did you import these relationships into PM or were they created through PM?

Thanks and regards

Shiva Raja

Re: snapmirror multi interfaces not available in PM

Yes, its a multi, as when hostpreferredAddr1 is set on both the source and destination filer, and when PM creates a VSM, it makes an entry in the snapmirror.conf of the destination filer as follows,

conn_name=multi(IP1,IP2)

and when hostpreferredAddr2 is also set on both source and destination IIRC it is used as failover between hostpreferredAddr1 and hostpreferredAddr2 connection. Though I will have to confirm the same.

Regards

adai