SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

REVIVERATE number
determines the amount of data revived between preemption checks. The higher the rate, the
more the impact on higher priority workloads; the lower the rate, the less the impact on higher
priority workloads. At the same time, the higher the rate, the faster the revive operation, and
the lower the rate, the slower the revive operation.
The minimum value is 0, and the maximum value is 100. The default value is 0, which causes
DP2 to use its internal default of 50.
This table shows the effects of specifying high and low values in the number field of the
REVIVEPRIORITY and REVIVERATE attributes when you specify these attributes in combination.
For Rate, Low is the range 0 through 50, and High is the range 51 through 100.
Effect of This CombinationRatePriority
The lowest possible impact to online activity. If there is no online activity, the revive progress
is slightly throttled by a low rate.
LowLow
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.
HighLow
The revive completes as quickly as possible, but there may be impact to concurrent activity.
This combination is recommended only when there is a requirement to complete the revive
as fast as possible in the case of high priority workloads.
HighHigh
DP2's internal default REVIVEPRIORITY of 50 (low) and REVIVERATE of 100 (high) is acceptable
for most environments. If there is any impact to concurrent activity, lower 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
Perform serial writes if the mirror disk is available. If the primary or mirror disk is not available,
and if FULLCHECKPOINTS is ENABLED or FORCED, full-block checkpoints protect the validity of
ENABLED
the data. ENABLED minimizes potential data loss caused by certain processor error conditions.
(Default)
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.
DISABLED
NOTE: This attribute is only valid for 514 byte per sector disks:
• internal SCSI disks in S-series enclosures
• 45xx disks in modular disk subsystems
DP2 ignores this attribute for 512-byte-sector disks:
• disks in an FCDM disk drive enclosure
• ESS disks in an Enterprise Storage array
• SAS disks in an MSA70 or M8390-12CG disk enclosure
On BladeSystems, this attribute is ignored. This attribute cannot be enabled for disk subsystems
attached with CLIMs because DP2 uses parallel writes for better performance. Serial writes are
not needed because the CLIM is fully buffered.
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.
ADD Command 213