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mzmultics

2 Posts

2210

April 7th, 2020 03:00

DataDomain - ifgroup setup - replication

Howdy all,

I have following setup - DataDomain 6800 with 8 data interfaces:

# net show hardware
Port    Speed     Duplex    Supp Speeds      Hardware Address    Physical    Link Status   State
-----   -------   -------   --------------   -----------------   ---------   -----------   -------
ethMa   unknown   unknown   10/100/1000      00:60:16:ab:09:ba   Copper      unknown       down
eth1a   unknown   unknown   100/1000/10000   00:60:16:9b:5b:30   Copper      unknown       down
eth1b   unknown   unknown   100/1000/10000   00:60:16:9b:5b:31   Copper      unknown       down
eth1c   unknown   unknown   100/1000/10000   00:60:16:9b:5b:32   Copper      unknown       down
eth1d   unknown   unknown   100/1000/10000   00:60:16:9b:5b:33   Copper      unknown       down
eth3a   10Gb/s    full      10000            00:60:16:99:26:84   DA Copper   yes           running
eth3b   10Gb/s    full      10000            00:60:16:99:26:85   DA Copper   yes           running
eth3c   10Gb/s    full      10000            00:60:16:99:26:86   DA Copper   yes           running
eth3d   10Gb/s    full      10000            00:60:16:99:26:87   DA Copper   yes           running
eth4a   10Gb/s    full      10000            00:60:16:99:26:60   DA Copper   yes           running
eth4b   10Gb/s    full      10000            00:60:16:99:26:61   DA Copper   yes           running
eth4c   10Gb/s    full      10000            00:60:16:99:26:62   DA Copper   yes           running
eth4d   10Gb/s    full      10000            00:60:16:99:26:63   DA Copper   yes           running
-----   -------   -------   --------------   -----------------   ---------   -----------   -------

Interfaces eth3x are added to the default ifgroup with ips as shown:

# ifgroup show config all
Group-name   Status    Interface   Clients   Replication
----------   -------   ---------   -------   -----------
default      enabled           4         1             1
----------   -------   ---------   -------   -----------
Group-name   Status       Interfaces
----------   -------   -------------
default      enabled   10.98.226.100
default      enabled   10.98.226.101
default      enabled    10.98.226.98
default      enabled    10.98.226.99
----------   -------   -------------
Group-name   Status    DD Boost Clients
----------   -------   ----------------
default      enabled   *
----------   -------   ----------------
Group-name   Status    Replication Mtree   Replication Remote Host
----------   -------   -----------------   -----------------------
default      enabled   *                   *
----------   -------   -----------------   -----------------------
File replication is allowed on ifgroup.
Client may use any interface.

As I understand this, only the 4 ips configure in "default" ifgroup should be used for Mtree replication, however after checking iostat I can see eth4d with ip 10.98.226.105 sending a lot of data. After checking with Network team it seems that this is the port that is sending Mtree replication data to the remote DataDomain.
 
Is there something I'm missing?
 
Additionally I'm thinking of extending this default ifgroup of the remaining 4 ips for (eth4x ports). Will that cause any network disruption? Will I need to do any extra config for clients to use those new ports (either for replication or clients connections)?
 
Cheers!

GonMur

33 Posts

April 20th, 2020 00:00

Hello there!

One clarification: Ifgroups are for DDBOOST operations (backup or Managed File Replication)

Managed File Replication is Networker cloning or NetBackup SLP Jobs.

So, ifgroups are not even considered for Data Domain mtree replication.

For mtree replication you should add a virtual interface aggregating all the eth3* physical interfaces under the same veth name.

Or if you have more than one destination target, you can dedicate a different interface to communicate with each destination (adding static routes)

Hope it helps.

Regards

Gonzalo

mzmultics

2 Posts

April 20th, 2020 01:00

Thanks for the explanation, that makes a lot of sense now. I had the virtual network interfaces configured for all of the physical ones.

 

kind regards

GonMur

33 Posts

April 20th, 2020 02:00

At some point in time, probably the ifgroups will support mtree replication, but not yet.

So your idea was not wrong, just not ready yet.

Kind Regards,

Gonzalo

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