How much storage should be allocated for the replication

#1) Ten 10 GB devices = 100 GB total capacity. Pointer-based replication (whether virtual or full volume using CoFA) only needs additional capacity for changes to source data. So if replicas need to be kept for 24 hrs and there's only 20% change to data (20% of 100 GB = 20 GB), only 20 GB of additional capacity is needed to hold the changed replicated data.

#2) Ten 20 GB devices = 200 GB total capacity. I have to assume you are using CoFA or CoFW (not pointer-based full copy mode). 20% data change of 200 GB = 40 GB data change, which is the amount of storage you need to store the changes.

#3) You have 10 source devices. Ignore the capacity, as it isn't relevant here. Each replicate device only needs to be kept for 24 hours. Check it out:

10 original devices---6hrs later---10 replica devices----6hrs later---10 replica devices---6hrs later----10 replica devices---6 hrs later 10 replica devices.

The 24 hours are up. So now you can dump the first set of replica devices. so you only need 40 replica devices to satisfy the 6 hour new replica requirement and 24 hour replication retention period.

#4)  Ten 9 GB devices. Ignore capacity, as it's just trying to throw you off. Solve exactly the same way as #3. You have 10 source devices and every 4 hours you need a new replica, and they only have to be held for 24 hours. Solve like #3.

Hi,

Thank you very much... I will learn again more concentration.

how to set...I am new with EMC

Hi, There is some info on points here.

-Stephanie