topic Re: use EMC Symmetrix 8730 and DMX 2000 together in Operating System - HP-UX

use EMC Symmetrix 8730 and DMX 2000 together

Brian Lee_4 — Wed, 17 Dec 2003 11:12:31 GMT

Since our customer can not bring down server for 14 hours to migrate 1.2 TB data from Symmetrix 8730 to DMX 2000, I would like to migrate 6 GB at the first time and then migrate rest of them later on.
Do you think that it is okay to use two different disks in one system ?

Re: use EMC Symmetrix 8730 and DMX 2000 together

Ashwani Kashyap — Wed, 17 Dec 2003 11:29:55 GMT

Yes you can have disks from different emc frames on one system .

Infact I did one 2 weeks ago . I stopped all I/O on one HBA that was going to the 8730 , then yanked the cable out and connected it to the DMX3000 , zoned it and then mirrored the logical volumes onto the DMX , then reduced the mirrors on the 8730 , yanked that cable and connected it to DMX and created the alternaye links .
Now doentime involved at all .

Re: use EMC Symmetrix 8730 and DMX 2000 together

Steven E. Protter — Wed, 17 Dec 2003 11:32:50 GMT

You plan will work.

All you need is a second interface to the new unit and you can do it with virtually no downtime at all.

I've had volume groups spanning local and disk arrahy for data migrations. I even once used mirror/ux to copy a logical volume to local disk get a quick copy prior to destroying the logical volume on the disk array.

HP-UX is industrial strength and flexible you see.

SEP

Re: use EMC Symmetrix 8730 and DMX 2000 together

Geoff Wild — Wed, 17 Dec 2003 11:40:52 GMT

Yes - this will work - we just migrated to DMX's this past summer.

If you have room in your vg's - you could just use lvm mirroring - we did that for some of our systems - zero downtime for your apps!

Rgds...Geoff

Re: use EMC Symmetrix 8730 and DMX 2000 together

Brian Lee_4 — Wed, 17 Dec 2003 11:41:58 GMT

That is great idea.

Re: use EMC Symmetrix 8730 and DMX 2000 together

Brian Lee_4 — Wed, 17 Dec 2003 11:44:43 GMT

Could you tell me extimated time for 1.2 TB
data sync when I do mirroring ?
Server :
model: rp7410
CPU : 750 mhz x 4
Memory: 24 GB

How was the performace during mirroring ?

Re: use EMC Symmetrix 8730 and DMX 2000 together

Geoff Wild — Wed, 17 Dec 2003 13:35:11 GMT

I think we did a 650GB DB in 7 hours with what we phrased "host based mirroring"....

Rgds...Geoff

Re: use EMC Symmetrix 8730 and DMX 2000 together

Tim Sanko — Wed, 17 Dec 2003 14:31:07 GMT

I think this may appeal to you if you have srdf. You can snap from one frame to the other in a very short period of time(30-60 minutes).

Tim Sanko

Re: use EMC Symmetrix 8730 and DMX 2000 together

Tim Sanko — Wed, 17 Dec 2003 14:34:07 GMT

I just took a look at the Powerlink.emc.com web site. And I believe that this is a correct statement. If your drives are fibre attached, and they bins are set up right....

SRDF from EMC is the way to mirror the data about as long as it takes to sync the same amount of BCVs.

Tim

Re: use EMC Symmetrix 8730 and DMX 2000 together

Geoff Wild — Wed, 17 Dec 2003 14:52:26 GMT

We did SRDF on a 1.5 TB SAP/Oracle - it took 3 days frame to frame. Main reason was - the new frame was configured with Parity RAID - so we had EMC change it to 112 Striped - RAID 1+0.

Don't get sucked into parity raid - sure less disks - but write performance is awful...

We then used vxfsdump/vxfsrestore to copy the data between vg's - only 4 hours.

Couldn't use LVM mirroring as MAX VGS was only 16 - because of previous admin.

Rgds..Geoff