topic Re: Timefinder/BCV Implementation in Operating System - HP-UX

Timefinder/BCV Implementation

SAM_24 — Sat, 21 Sep 2002 19:26:04 GMT

Hi,

Is following possible?

GROUP1={STD device 1-3 + BCV 1-3 }
GROUP2 ={Same STD devices as above + BCV 4-6 }

Can same STD device be present in two emc device group?

Thanks.

Re: Timefinder/BCV Implementation

Ashwani Kashyap — Sun, 22 Sep 2002 00:11:56 GMT

On an EMC Symmetrix frame a device can belong to one and only one group .

However you can use concurrent BCV's to support what you want to use , provided you have a symmetrix frame .

Concurrent BCV's are microcode dependent , so you have to check the micro code of your symmetrix box .

Re: Timefinder/BCV Implementation

MANOJ SRIVASTAVA — Sun, 22 Sep 2002 03:15:14 GMT

No the same STD device cannot be a part of 2 groups , hoever you can establish one std and upto 16 mirrors in the same group but only one pair at a time , ie on std and 1 bcv thats it , to have multiple BCV copies you need to split and restablis the relatiosnship with new BCV dvice and split again

Manoj Srivastava

Re: Timefinder/BCV Implementation

SAM_24 — Sun, 22 Sep 2002 04:57:53 GMT

Hi Ashwani and Manoj,

Either my question was misunderstood or I didn't explain well.

What I was expecting is multi function BCV. I don't want to attach std device with two BCVs at the same time.

I want to establish std device with BCV1 at 10 PM and same std device with BCV2 at 4 AM. In order to do it I should create two groups. Am I right?

Please see Timefinder demo in EMC website. The slide before Concurrent BCVs talks about multi function BCV. Upto 8 BCVs can be remembered by Timefinder for one standard device.

Thanks.

Re: Timefinder/BCV Implementation

Animesh Chakraborty — Sun, 22 Sep 2002 12:37:04 GMT

Hi Raj,
Yes you can have two bcv group at with same standard.
But before establishing 2nd set of bcv you need to issue following command

#symld -g bcv1 moveall bcv2

to see the group
#symdg show

Re: Timefinder/BCV Implementation

Animesh Chakraborty — Sun, 22 Sep 2002 12:41:58 GMT

it is
#symdg list

Re: Timefinder/BCV Implementation

John Poff — Sun, 22 Sep 2002 13:20:30 GMT

Hi Raj,

You can't have the same std devices in two different groups, but you don't need to do that to do what you want to do. We have an EMC BCV configuration just like what you are describing. We have one device group, and two sets of BCVs. We use the first set to split off for backups, and the second set is mounted to a test/development system for use by programmers. You can have up to eight BCVs associated with one std device. As someone else has mentioned, it all depends on the EMC microcode level in your Symmetrix array and the level of EMC software you are running. You can even keep up with up to eight sets of BCVs and just do incremental re-syncs to the std devices as needed, so you don't have to do a full resync each time.

JP

Re: Timefinder/BCV Implementation

Ashwani Kashyap — Sun, 22 Sep 2002 15:52:00 GMT

Raj ,
YOu can do something like this .

GROUP1 = (STD Devices 1-3 + BCV 1-6 )

AT 1.00 clock establish STD 1-3 with BCV 1-3 . AFter they are synchronised split it .

At 4.00 establish STD 1-3 with BCV 4-6 .

Of course here for establishing and spliting , you have to use the individual device names (logical or physical ) instead of the group name .

As I said earlier , you have to check the version of your microcode and your software version , whether they support multiple /concurrent BCV's or not .

Re: Timefinder/BCV Implementation

SAM_24 — Sun, 22 Sep 2002 16:43:32 GMT

Hi John and Ashwani,

Thank you , I got all the information I needed.

Raj