1) Which system create DG?
like "gni00101_vg01" , such DG is created by which system?
DG names will be created by ourselves.
System will not create DGs.
2) Why we create DG?
While create a Storage on a new Host , we should take Backup for the host data.
So in VMAX, for replicating the production volume data, there is a technique called TimeFinder/Clone.
So, we will create STD volume(Production) and BCV volumes( Copy of Production volume) as a group.
Such group is theoretically called as Device group.
For initiating copy from production volume to backup volume --> we will create a clone relation ship on every DG.
DG is simply like a mapping of STD volume to BCV volume.
the process of creating DGs is called DG setting.
for GDC,
We will do DG setting on gepbkp01 gepbkp02 gepbkp07.
DRC:
We will do DG setting on gepbkp05 gepbkp06 gepbkp09.
JDC:
We will do DG setting on bkj0d101 bkj0d201 and production server.
3) Why the STD device can be deleted on backup server?
STD devices are deleted from Backup server or production server --> It is actually deleting the STD devices from the respective Device groups.
Since we are decommissioning the host, we have to remove the host production volumes from taking copy to BCV volume.
For this, we will just remove the STD and BCV devices from the respective DGs.
We will also terminate the Clone relation between two volumes.
Thanks for your questions.
If you need any further clarification, I am ready to help you.
Thank you for learning.
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在VMAX里，使用time finder/clone来保证生产机的冗余性，在存储上挂STD盘挂给production server,BCV挂给backup server。