Server Migration to new EMC Storage

[Jeongbae Min]

Hello,

I plan to replace current EMC SyMM to DMX as well as HP servers for SAP. But I do not plan to use EMC SRDF data migration service. For SAP system, I can use "rcp" to copy database files but I have three more HP hosts to be moved to new EMC box. How can I migrate current HP servers which attache Old EMC to new EMC with data. Each server has 100G of data in it.

Thanks in advance.

Jeong

[Steven E. Protter · Accepted solution]

rcp is probably the worst way to copy those databases.

I tried that once with oracle databases and binaries. I ended up with different file counts and had to recover the databases even though they were down.

Better ideas:

1) use mirror/ux to copy mirror the logcial volumes while the database is down. Then use lvsplit to break the mirror. unmount and mount and you get a perfectly clean copy.

2) scp is more reliable than rcp
3) Mount via NFS and do a staight copy


All suggestions above require a down database.

SEP

[Geoff Wild]

There are many ways to do this - did it myself last year...

If room in the volume groups, you can mirror the lvols to the new storage - then reduce the old one - this can be done online with no outage.

If you don't have the room - then create new vg's/lvols - and use vxdump to copy the data from old to new like so:

vxdump -0 -f - -s 1000000 -b 16 /oracle | (cd /new/oracle ; vxrestore rf -)

Rgds...Geoff

[Jeongbae Min]

Hi Steven,

use mirror/ux to copy mirror the logcial volumes while the database is down. Then use lvsplit to break the mirror. unmount and mount and you get a perfectly clean copy.


I had better to follow your method.
Can you provide me more detail procedure?

Thanks

[Jordan Bean]

When my vgs were low on available extents, preventing mirroring, I would create new vgs on the new Symm and cpio the file systems. This usually was a good time to resize and redistribute the lvols more efficientlty.

All my systems use PowerPath with at least two channels per target. Before I had SAN I would deconfigure one channel, swing it over to the new Symm, and migrate the data. Later zoning on the new SAN made such migrations more interesting... I did them from home after EMC setup the new frames, switches, and connections.