HP StorageWorks XP24000 Continuous Access Journal Software User and Reference Guide, v01 (T5278-96001, June 2007)
Figure 58 Ch an ge JNL Option Window
The Change JNL Option window displays the following:
• Inflow Control: Allows you to specify whether to restrict inflow of update I/Os to the journal
volume (in
other
words, whether to slow delay response to hosts).
Yes indicates inflow will be restricted. No indicates inflow will not be restricted.
Note
:If Yes is selected and the metadata or the journal data is full, the update I/Os may stop.
• Data Overfl
ow
Watch: Allows you to specify the time (in seconds) for monitoring whether
metadata
a
nd
journal da ta are full. This value must be within the range of 0 to 600 seconds.
Note
:If In
flow Control is No, Data O verflow Watch does nottake effectand does notdisplay
anything.
• Copy Pace: Allows you to specify the pace (speed) for an initial copy activity for one volume. The
default i
s
Low.
• Low: The speed of the initial c opy activity is slower than Medium and High.
• Medium: The speed of the initial copy activity is faster than Low and slower than High.
To
specify Medium, ensure that the amount of update I/Os (that is, write requests from hosts to
primary
datavolumes)is10MB/sorlessper oneparitygroup. Ifitexceeds 10 MB/s,data
volume pairs may b eco me split (suspended) .
• High: The speed of the initial copy activity is faster than Low and Medium.
To
specify High , ensure that update I/Os (that is, write requests from hosts to primary
data volumes) will not occur. If update I/Os occur, data volume p airs may become split
(suspe
nded) .
Note:
The secondary storage system administrator cannot specify this o p tion.
• Unit of Path Watch Time: Allows you to specify the unit of path watch time. You can specify
one
of t
he
following: minute, hour,or day.
• Path Watch Time: Allows you to specify the interval from when a path gets blocked to when a
mirror g ets split (suspended).
This value must be within the range of 1 to 59 minutes, 1 to 23 hours, or 1 to 30 days. You can
specify a numeric value in Path Watch Time.
Note:
Make sure that the same interval is set to both the m aster and restore journal groups in
the
sa
me mirror, unless otherwise required. If the interval differs bet ween the master and restore
journal groups, these journal groups will not be suspended simultaneously. For example, if the
interval for the m aster journal group is 5 minutes and the interval for the restore journal g roup is
60 minutes, the master journal group will be suspended in 5 minutes af ter a path gets blocked,
and
the restore journal group will be suspended in 60 minutes after a path gets blocked.
Note:
If you want a mirror to g et split (suspended) imme diately after a path gets blocked, ask
technical suppor t to set the system option mo de 448 to ON and set the system option m ode 449
to
O
FF. For detailed information about the modes 448 a nd 449, see Table 23 on page 121.
120
Using
Journal Groups