HP XP P9500 Storage - Manual (Page 95)

3. In the tree, right click a journal below Registered > LDKC00 and then select Journals > Change
JNL Option.
4. For Inflow Control, specify whether to restrict inflow of update I/Os to the journal volume
(slows delay response to hosts).
For example, you could have a 100 GB-bandwidth data path with three journals using it. If
an important database is saved to a primary volume in one of the journals, with data of lesser
importance in the other journals, you may decide to restrict the Inflow Control for the less
important journals while not restricting control to the important journal.
Yes indicates inflow will be restricted. No indicates inflow will not be restricted.
If Yes is selected and the metadata or the journal data is full, the update I/Os may stop.
5. For Data Overflow Watch, specify the number of seconds for the system to monitor write data
to the journal volume when the journal volume is full (100%). Range is 0-600 seconds. Default
is 60 seconds.
If Inflow Control is No, Data Overflow Watch is disabled.
NOTE: The metadata area is not a candidate for Data Overflow Watch. If the metadata
area is full, the journal is suspended with an error regardless of the value of Data Overflow
Watch.
In a 3 Cnt Ac-J Z DC multi-target configuration, when two or more mirrors in the primary site
are in Active status, if the free space in the journal data area or metadata area decreases to
a critical level, one of the mirrors in the journal will be suspended with an error regardless of
the value of the Data Overflow Watch.
6. For Use of Cache, specify whether to store journal data (initial copy or resynchronization data)
in the cache memory on the remote side (restore journal).
- Use: Journal data will be stored in the cache. When there is insufficient space in the cache,
journal data will also be stored into the journal volume. This setting only takes effect on the
journal volumes of RAID-5 or RAID-6.
- Not Use: Journal data is not stored in the cache.
- Blank: The current setting of Use of Cache will remain unchanged.
NOTE: This setting does not effect master journals unless the Business Continuity Manager
YKRESYNC REVERSE command is used to change a master journal into a restore journal.
Journal and mirror maintenance 95