OVNPM 1.5.2 - Performance Agent for NonStop Server Monitoring Guide

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3-7 DISKFILE
The DISKFILE domain represents the activity on a disk file.
For D-series and G-series running Measure G07 and previous versions, an asterisk (*) indicates that metrics are
not collected every 15 or 30 seconds, but every 1, 2, 4, 8, 16 or 32 minutes based on the IoCollectInterval=n
parameter in the DCPRM file.
3-7-1 DISKFILE Instance Configuration
Domain
DISKFILE
DescriptionDomain
DISKFILE represents the activity on a disk file.
Syntax
DISKFILE <$Volume>.<Subvolume>.<File> [,TREND=<ON|OFF>]
Example
DISKFILE $DATA.DATABASE.FILE1
Comments Some metrics on this domain are collected every 1, 2, 4, 8, 16,
or 32 minutes based
on the IoCollectInterval parameter in DCPRM file.
3-7-2 DISKFILE Metrics
Metric
Description
Block-Splits.nb (*)
Number of block splits during writes to the file.
Cache-Read-Hits.nb (*)
Number of times a read operation found the required block in cache, which saves a disk
I/O.
Cache-Write-Cleans.nb (*)
Number of times a write operation found the required block in cache, saving a read
operation to bring the block into cache.
Cache-Write-Hits.nb (*)
Number of times a write operation found the required block in cache and saved a read
I/O.
Disc-Ext-Warn.nb
Number of times that the size of the next allocated extent (primary or secondary extent)
of the file is larger than the largest extent size of the disk.
• For a single file
This number can be equal to 0 or 1 (0 means the file will not have a problem for the
next extent allocation, 1 means that the next extent allocation will fail)
• For a partitioned file
This number may be greater than 1 due to multiple secondary partitions
Consideration: If the file has no allocated extents, the next allocated extent is the primary
extent. If the file has at least 1 extent allocated, the next allocated extent is a secondary
extent.
Eof.KB
Size in Kbytes of the file.
Allocated-Extent.nb
Number of extent allocated.
Free-Extent.nb Number of free extents for the file. For a partitioned file, this number is returned for the
partition with the smallest Free-Extent.nb.
Full.%
Percentage Full of the file.
Lock-Bounces .nb(*)
Number of bounced locks (FELOCKED = error 73) returned to the File System.
Lock-Timeouts.nb (*)
Number of time-outs on locks (error 40).
Lockwait-Time.% (*)
Time in microseconds spent waiting for locks.
Open-Qtime.% (*)
Time in microseconds for all the opens of this file (including transient opens)
oss-blocks-write.nb Number of block write operations issued by DP2 for the OSS File System during last
collect interval [meas]
oss-cache-callbacks.nb
Number of cache callback requests sent by DP2 to the OSS file manager during last
collect interval [meas]
oss-callback-write.nb Number of OSS-BLOCK-WRITES received by DP2 as a result of OSS-CACHE-CALLBACKS
during last collect interval [meas]