SCF Reference Manual for the Storage Subsystem (G06.24+, H06.03+)

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
14-22
ADD DISK Command
DP2's internal default REVIVEPRIORITY of 50 (low) and REVIVERATE of 100
(high) is typically acceptable for most environments. If there is any impact to
concurrent activity, lower the REVIVERATE until the impact is reduced to an
acceptable level.
SERIALWRITES { ENABLED | DISABLED }
(mirrored volumes only) specifies whether serial writes are used when updating
files.
SQLMXBUFFER number
(SQL/MX volumes only) is the buffer size (in megabytes) for an SQL/MX session.
number is in the range 0 through 768. The default is 0. Do not use this attribute
for TMF audit-trail volumes.
If you specify too large or small a value, DP2 automatically sets the needed size.
If you specify a value of 0, DP2 automatically sets the size of the buffer to 128.
If SQL/MX is not installed, setting this attribute to 16 allows the increase of the
DP2 cache to its maximum.
STARTSTATE { STARTED | STOPPED }
specifies whether the IOP is available to other processes (STARTED) or
unavailable (STOPPED) when the system is loaded or reloaded. The default is
STARTED.
Low Low This combination ensures the lowest possible impact to
online activity. If there is no online activity, the revive
progress is slightly throttled by a low rate.
Low High This combination ensures that the revive makes
progress, but it has limited impact to online activity. If
there is no online activity, the revive progress will be as
fast as possible.
High High This combination ensures that the revive makes
progress, but it has limited impact to online activity. If
there is no online activity, the revive progress will be as
fast as possible.
ENABLED Perform serial writes if the mirror disk is available. If the primary
or mirror disk is not available, and if FULLCHECKPOINTS
(page 14-13) is ENABLED or FORCED, full-block checkpoints
protect the validity of the data. ENABLED minimizes potential
data loss caused by certain processor error conditions. (Default.)
DISABLED Do not perform serial writes unless this attribute has been
specified for a specific file and the mirror disk is available.
DISABLED maximizes the performance of mirrored disks.