On Wed, Sep 6, 2017 at 9:16 AM, Lizette Koehler <[email protected]> wrote:
> List > > I am looking for some guidance on how to manage large (1TB or more) zFS > Files. > > When DFHSM does a backup it will use DFDSS to do the work. This quiesces > the > zFS until the backup completes. This can cause the zFS to be unavailable > for a > long time (30 mins or more) while the quiesce is waiting to complete or the > backup is in progress. If DFHSM cannot quiesce the zFS then there is no > backup > > Do most shops let DFHSM do backups on zFS files? > We don't. > Do you have a limit of what size zFS DFHSM is allowed to do the backup? > Do you have a window when you allow DFHSM to do such backups? > How do you create a copy of a large zFS for Business Continuity or DR? > We simply do a series of full volume back ups. This does not quiesce the filesystem. So the backup could be "fuzzy". However, this is done on a Sunday when our activity is minimal. > > Thanks > I am wondering if you really need such a big zFS filesystem. Of course, if you have really large files, then it most likely does need to be large. But if you have multiple directories, I would simply find the larger ones and split them off into their own zFS filesystem datasets. You could then back them up. Since that could be done in parallel, your outage time should be less. > > Lizette Koehler > statistics: A precise and logical method for stating a half-truth > inaccurately > > -- UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things. -- Doug Gwyn Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
