>As I am sitting here designating the file system for my next Linux LPAR, It >occurs to me that it will be advantageous to take the 2 remaining 3390-mod >3 1 gig custom volumes I have and make them into a single 2 gig volume with >LVM. My management wants all this done in CDL so that we can take volume >backups, etc. via S/390.
>The question I have is this - what are the implications/problems/concerns >with having 2 CDL volumes (2 vtocs, etc) in a Linux managed LVM? Dont know much about the 390 backup facilities. I figure they look for format 1-3 dscbs and backup the dataset to some media. I doub't you'll see additional extent dscb or indexed data dscb entries on a Linux system. So, basically your just backing up a format 1dscb ... copying the 390 "partition" to some media. I also figure that lvm pulls the format 1 dasd extents as physical volumes (pv) into the volume group ... and then carves them up into its own phys extents (pe) which are used when mapping logical extents (le) in the volume. So, you are basically talking about backing up a single extent (format 1 dscb) on each dasd. Not knowing how they actually get backed up, I'd say the biggest headache is keeping them in sync. Since your volume will be spread across two different backups you'll want to be sure the backups are done together and then related to each other somehow-date/time/sequence number/etc. I assume the 390 backup facility takes care of all of this stuff ;-) -Don
