you could also use a writeable snapshot

BTW you didnt mention whether you mean for SAN or for NAS - which could make a difference

the local replication for luns, you have to use CLI for now, which involve below steps:

1) Create same sized lun with repldest yes flag on uemcli and note the resource ID

2) Use the "uemcli /prot/rep/session create" command to setup replication

Unisphere can be used to manage, once it is created

Example:

1) Find out the space of the lun you want to replicate.

Example:

03:20:42 service@unknown spa:~> uemcli -no /stor/prov/luns/lun show -detail

1:    ID                   = sv_73                <== Note the lun resource id

      Name                 = lunlocalsrc

Description          =

      Group                =

      Storage pool ID      = pool_1     <== Note the pool id

      Storage pool         = AF_Pool

      Health state         = OK (5)

      Size                 = 1073741824 (1.0G) <== Note the size

      Protection size used = 0

      SP owner             = SPB

      Trespassed           = no

2) Create a new lun with same size and the same pool like below example (note the details including admin user name/password and replace as required):

Example:

03:17:20 service@unknown spa:~> uemcli -no -u admin -p AdmPassword /stor/prov/luns/lun create -name lun_local_dest -pool pool_1 -size 1073741824 -thin yes -replDest yes

ID = sv_74 <== Note this new lun's resource id

Operation completed successfully.

3) Create the replication session as below (name can be anything or can be ignored as well) :

Example:

03:20:23 service@unknown spa:~> uemcli -no -u admin -p MyPassword /prot/rep/session create -srcRes sv_73 -dstType local -dstRes sv_74 -name local_lunrepl -syncType auto -rpo 10m

ID = 42949673580_APM123_0000_42949673581_APM123_0000

The target lun, snapshop can be used to access the data, though it will not be continuous.

For NAS, you can do local replication using Unisphere, but you cannot access unless you can do a failover.

very very helpful !!