During a previous project I had the opportunity to work very closely with the EMC people and Symmetrix arrays, in fact I got a couple of very good friends from that project. At the time I created a bunch of text files for my self reference about EMC SRDF and Timefinder technologies.
Today I decided to review that files, give them some order, well sort of, and put them here as a survival guide/quick reference in the hope that will be of help to any of you. The first of this guides will be about EMC Symmetrix Timefinder.
I don’t have sample output for every command, been more than a year since the last time I work with Timefinder, to complement my own samples I got several outputs from the Timefinder manuals.
This is not a complete Timefinder usage guide, just my personal notes taken from my direct experience with product.
EMC Timefinder is a replication solution that creates full volume copies. For the full-HP guys out there this is very similar to the XP or EVA Business Copy product.
There are two basic types of replication:
TimefinderClone - Creates point-in-time copies.
Timefinder/Snap - Creates pointer-based replicas, snapshots, only the changed data is written.
There are several optional components.
Timefinder/CG (Consistency Groups)
Timefinder/EIM (Exchange Integration Modules)
Timefinder/SIM (SQL Integration Modules)
Timefinder allows to retain multiple copies at different checkpoints for lowered RPO and RTO.
Following is a list of the most basic symcli commands necessary to get your way around when you perform any Symmetrix task, including Timefinder.
Get the list of the Symmetrix devices
List all available devices from a device group
List host physical devices
List the disk groups:
Add devices to a disk group
Add physical devices
Add Symmetrix devices
Get diskgroup detailed info.
Associate BCVs to a device group. There are two ways:
Establish the mirrors
There are several additional split modes and/or modifiers.
Restore the BCV mirrors.
The restore operation will copy the data from the BCV to the Standard device.
It is very important to tell the difference between Restore and Reestablish. Reestablish will do a differential
update from the Standard device to the BCV device.
Get the list of BCV devices
Get the state of mirroring of the device pairs within a device group
List all BCV sessions in a Symmetrix array
And we are done. As I said this is not a full guide so please if there is anything that you don’t get please leave a comment and I will try to clarify. Also if any of you have additional tips or recipes for Timefinder please comment.