Options for making full image copies

We recommend the following practices:

• If your backup strategy is to make full image copies only (no incremental copies), always use RESETMOD NO.
• If your backup strategy is to make full image copies of only the spaces that have changed since the last image copy, use RESETMOD NO with FULL AUTO FULLPCT(.01) or CHANGELIMIT(.01).
• If your backup strategy is to make both full and incremental copies, make full copies as follows:
  • If you can make copies using SHRLEVEL REFERENCE, and can tolerate stopping the target spaces after the copy, use RESETMOD YES.
  • If you cannot use SHRLEVEL REFERENCE or cannot tolerate stopping the target spaces, and you do not require the modified page indicators to be reset, use SHRLEVEL CHANGE and RESETMOD NO.
  • If you cannot use SHRLEVEL REFERENCE or cannot tolerate stopping the spaces and require the modified pages to be reset, you can use SHRLEVEL CHANGE RESETMOD YES. If SHRLEVEL CHANGE RESETMOD YES is specified and the option SLCHGRESET is NO, BMC AMI Copy passes the COPY command to the IBM Db2 COPY utility. Many BMC AMI Copy options are ignored because they are not supported by the IBM Db2 COPY utility. These options are the same as those documented for the special spaces, which are also passed to the IBM Db2 COPY utility. (See Copying-the-Db2-catalog-and-directory for the options not supported.)

If you routinely back up your table spaces before applying updates in batch mode, using SHRLEVEL CONCURRENT enables you to make those copies while the updates are in progress (provided you have the SNAPSHOT UPGRADE FEATURE installed and can make Snapshot Copies). Making Snapshot Copies in this situation narrows the batch window and provides you with SHRLEVEL REFERENCE copies in the event the batch update fails and a RECOVER TOCOPY is necessary.