Search <book_title>...

Veritas Access Appliance Administrator's Guide

Last Published: 2023-10-29

Product(s): Appliances (8.0)

Platform: Access Appliance OS,Veritas 3340,Veritas 3350

Addition of multiple file systems to a Replicated Volume Group

Access Appliance supports the addition of multiple file systems to a Replicated Volume Group (RVG). You can enable replication for many file systems in a single RVG.

Considerations while configuring Access Appliance for continuous replication:

The number of RVGs configured under continuous replication on Access appliance should be restricted to 4.
The number of file systems under one RVG should be limited to 12.
Veritas recommends that you to add one file system at a time to an RVG. Once the file system is added and the status of continuous replication becomes consistent (up-to-date), add another file system to the RVGs.
See Setting up the file system to replicate .
Ensure that continuous replication IPs configured on Access Appliance are properly resolved by the configured DNS server or by /etc/hosts file.
Addition of multiple file systems to an existing Replicated Volume Group is supported only through CLISH.

To configure an RVG with multiple file systems

Create an RVG. You can specify the name in the parameter.

replication> continuous enable fs_name pool_name link_name 
[delayed=yes|no] rvg_name create_target_fs
	srl_size

fs_name	Specifies the name of the file system. It should be present on the source cluster.
pool_name	Specifies the pool name. It should be present on the source as well as destination cluster.
link_name	Specifies the link name. This link is created during authentication of the source and the destination cluster,
[delayed=yes\|delayed=no]	Specifies if the continuous replication should happen in delayed mode. This is an optional parameter, and the default value is 'no'.
rvg_name	Specifies the name of the RVG.
create_target_fs	The value is `yes` if you want to create file system on secondary cluster. Else, the value is set to `no`.
srl_size	Specify the SRL size for the file system.

For example: To create an RVG, rvg_test:

replication> continuous enable fs1 pool1 src_link delayed=yes rvg_test

You can specify the RVG name in the command. If the RVG name is not specified, the RVG is created with the default name. The default name of the RVG is rvg_fs_name.

Before adding another file system, ensure that the data is synced between the primary and secondary sites and the second file system is offline.
```
replication> continuous status fs_name
```
Add another file system to the same RVG.
```
replication> continuous enable fs_name pool_name link_name 
[delayed=yes|no] rvg_name
```
Note:
If you have configured any CIFS or NFS shares on the file system, you must remove them before you add the file system to an existing RVG.
For example: To add a file system. fs2 to the existing RVG, rvg_test:
```
replication> continuous enable fs2 pool1 src_link delayed=yes rvg_test
```
After the execution of this command, rvg_test is created with two file systems in it, fs1 and fs2.
You can add more file systems in the RVG by repeating steps 2 to 3.

You can view the mapping between the RVG and the file systems using the following command:

replication> continuous show
RVG                    FS List
------                 ---------------
rvg_test               fs1,fs2

The replication continuous commands such as start, stop, pause, resume, failover, and failback accept the file system name as the parameter, but the changes are applicable for the entire RVG (including all the file systems which are part of the RVG).

For example, if you have multiple file systems in an RVG and if you failover using the replication continuous failover fs1 command, then the entire RVG will fail over.

The replication continuous disable command does not delete the RVG until the file system is the last file system in the RVG.

For each file system that is added to the RVG, if the file system is configured in async mode, the Storage Replicator Log (SRL) grows by 20% of the file system size, and if the file system is configured in sync mode, it grows by 5% of the file system size. If the SRL has been grown more than 12 times(either as a result of the fs grow command or addition of file systems to the RVG), then the SRL is not grown further.

You can also set the maximum SRL size for an RVG.

replication> continuous config set_max_srl_size rvg_name size

For example, the following command sets the SRL size to maximum of 200GB for rvg_test.

replication> continuous config set_max_srl_size rvg_test 200G

You can also use the replication continuous enable command for setting the RVG size.

replication> continuous enable fs1 pool1 source 
delayed=yes rvg_test create_target_fs=yes 100G

Here, 100G is the SRL size for rvg_test, which is an optional parameter.

This option is useful when setting the SRL size for the first file system when an RVG does not exist.

You can also view the current SRL and maximum SRL size. Appropriate messages are shown after the completion of each command to inform the user about successful completion or reason for failure.

You can verify whether the file systems are added correctly and the appropriate SRL size is set.

replication> continuous show

RVG           FS List     SRL Size
============= =========   ========
rvg_test      fs1,fs2,fs3 204m

You can also verify whether the maximum SRL size is set correctly.

replication> continuous config show

Link name Remote Console IP Remote Replication  Time of Key Import	
		 							                  VIP
========= ================= =================== =========================== 

clus_repl 10.221.35.102     10.221.35.104 						Tue Oct 12 23:22:19 PDT 2021 

Time of Authorization         RVG  									    Max SRL Size
============================  ==============    =================
Tue Oct 12 23:23:32 PDT 2021  rvg_test						    -
	                             rvg_test2 					   19g
                              rvg_test3				    	10g
                              rvg_test4				    	11g