HP StorageWorks Command View SDM Installation and User Guide (T1086-96023, February 2005)

Command Line User Interface 161
Command Line User Interface
New RAID 1+0 Writes OPAQUE The number of write operations to previously unwritten
LUN addresses posted out of the write cache to RAID 1+0
storage.
Usage
New writes are host writes to LUN addresses that have not
been written since the LUN was created. AutoRAID will
decide whether to place write data into RAID 1+0 or RAID
5 DP storage when it is posted out of the write cache.
When RAID 1+0 is the destination for a new write, the
space allocation can be fulfilled by creating a new RAID
1+0 storage area or by selecting free space in an existing
RAID 1+0 storage area. A large number of new writes
such as may occur when loading data onto a newly
created LUN can cause free disk space to be consumed
rapidly leading to possible invocation of the make space
policy and the associated performance impacts. AutoRAID
attempts to detect the data load scenario and direct new
writes to RAID 5 DP storage so as to conserve free disk
space in that case.
Table 12 Performance Metrics (Continued)
Metric Categories Description/Usage