Bernard Dhooghe wrote:
> Remark: As JFS2 is used, a (newer) capability is snapshot. There is no
> need to break a mirror and resync it.
>
> Space is needed in the vg for the JFS2 changes during the lifetime of
> the snapshot.
>
> Bernard Dhooghe

Hi Bernard,

I tried snapshot a while back when I was first informed about it, but
the command did not work as planned. It creates images of a particular
file system, but these images did not appear to allow us to access the
files in the snapshot, it just let you see it as one large binary file.

What we want to do is create a backup tape on DDS4 tapes in either tar
or cpio format which contains a copy of the file system contents. We
have a datavg volume group, and it contains a series of file systems
listed under the /live mount point. The file systems contain ISAM data
files, COBOL programs, runtime software, and various reference files.

In the JFS world, we used to splitcopy the files system into a live and
frozen version, and we would then run our backups in the frozen version
while users would continue to work in the live version. In the JFS2
world, we want something similar to this. splitvg looks like it offers
the closest similar method.