Data Migration from old DS2100 to new DS2120

[Jun H. Lee]

I need help to migrate data from old DS2100 with 4x36GB disks to a new DS2120 with 3x146GB.
What is the best way to do this kind of job? Please note that, the source has 4 disks but destination has only 3 disks. I am thinking to use "dd" commend. Some how, I need to put two source disks into one disk.

Is there anyway I can do this?

[A. Clay Stephenson · Accepted solution]

dd is not the tool for this. You will wind up with 3 disks and only 36GiB on each disk will be usable. The most straightforward way is to create a new volume group, make new LVOL's, create filesystems, mount them, and then logically copy the data. An fbackup | frecover pipeline is probably the fastest method to handle large files and preserve the ownerships and modes of all the files and directories. You wanted something quick and dirty but you asked the wrong question.

[Steven E. Protter]

Shalom,

I recommend creating logical volume structure and then either use the cp -R command or a backup/restore with fbackup to be sure everything works.

Make sure any databases are shut down during the backup stage, those applications can't be hot when the copy occurs. Take note of raw disk areas, and don't forget them.

SEP

[Jun H. Lee]

Thanks all.
Is there any chance for using mirror?

[A. Clay Stephenson]

That is not realistic. The max_pe's and pe_size are set when a VG is first created and normally default to values which accomodate the largest disk (PV) listed when vgcreate was executed. Unless you specifically set these values to allow the full use of your larger disks (highly unlikely) when you created the VG, you will only be able to use 36GiB's or so of your new disks. The newest versions of HP-UX have abilities to changes these values but otherwise it's a logical copy. I specifically suggested an fbackup/frecover pipeline because that way all file attributes are preserved. That is a bit tricky using cp -r. As Steven, correctly pointed out, if you are actually storing data as raw files then your tool is dd but for everything else logical copies are appropriate.

[Jun H. Lee]

Thank you very much.