HP OpenVMS System Management Utilities Reference Manual

The class prefix always follows the class header for component class records. It contains data describing the number of elements (for example, processes for the PROCESSES class, disks for the DISK class) represented by the class records for the current collection interval. Unlike system class records, which have one data block per record, component classes have one data block per element.

One of the class prefix data items describes the number of elements (and therefore the number of data blocks) included in the class record. The other class prefix data item is used only for the PROCESSES class, and describes the number of processes included in the interval. The following discussion applies only to the PROCESSES class.

It is possible to monitor a number of processes so large that the required number of data blocks for one collection interval does not fit into a single maximum size record. In this case, the required number of PROCESSES class records is created to fully describe the processes.

All class headers in the set of PROCESSES class records for a given interval are identical, except for the setting of bit 0 in the MNR_CLS$W_FLAGS field. This bit is set to 1 for all records except the last, for which it is set to 0.

The class prefixes in the set of class records vary, as described in the table following the next figure. The contents of the MNR_CMP$L_ELTCT field depends on the number of data blocks contained in the record; the contents of the MNR_CMP$L_PCTINT field remain constant for each record in the set. All records in the set except the last contain as many data blocks as will fit into the maximum size record (32000 bytes). The last record in the set contains the remaining data blocks.

Figure H-7 illustrates the class prefix format.

Figure H-7 Class Prefix Format

The following table describes the fields in the class prefix. The class prefix is 8 bytes long.

Field	Symbolic Offset	Contents
Elements in Record	MNR_CMP$L_ELTCT	Count of elements (data blocks) in this record (1 longword).
Processes in Interval	MNR_CMP$L_PCTINT	Count of processes (data blocks) for this interval (1 longword). This field is for the PROCESSES class only. For other component classes, this longword is reserved to HP for future use.

H.4.2 Class Data Blocks

The size and format of each data block and the number of blocks per record depend on the class. System classes have one data block per record. Component classes have one data block per element. The fields within each block are performance data items.

The following sections describe the data items within the data block for each class. Every data item falls into one of three categories. It is either a count, a level, or an informational item. A count is a numeric quantity that increases at each succeeding interval for the duration of a system boot. A level is a numeric quantity that may increase or decrease at each succeeding interval. An informational item represents data that, rather than being a unit of performance measurement (as are the first two types), is descriptive in nature.

In the tables that follow, item types are identified by the letters C (count), L (level), and I (informational). Item types are shown in parentheses, following the length of the field. Class records are listed alphabetically.

H.4.2.1 CLUSTER Class Record

The CLUSTER class record contains data describing clusterwide CPU, memory, and locking activity. The CLUSTER class record has a record type of 19 and a size of 65 bytes. Note that when the CLUSTER class is recorded, the DISK and MODES classes are also recorded, even if not explicitly requested.

Figure H-8 illustrates the format of the CLUSTER class record.

Figure H-8 CLUSTER Class Record Format

The following table describes the fields in the data block for the CLUSTER class record:

Field	Symbolic Offset	Contents
CPU Busy	MNR_CLU$L_CPU_BUSY	Count of clock ticks (10-millisecond units) spent in all CPU modes since system was booted (longword,C)
Free List Size	MNR_CLU$L_FRLIST	Number of pages currently on the free list (longword,L)
Reserved	MNR_CLU$L_RESERVED	Reserved to HP
Total Locks	MNR_CLU$L_TOTAL_LOCKS	Total of all incoming, outgoing, and local ENQs, DEQs, and conversions (longword,C)
New ENQ Local	MNR_CLU$L_ENQNEWLOC	Count of new lock requests that originate and are performed on the system (local) (longword,C)
New ENQ Incoming	MNR_CLU$L_ENQNEWIN	Count of new lock requests that originate on other systems and are performed on this system (incoming) (longword,C)
New ENQ Outgoing	MNR_CLU$L_ENQNEWOUT	Count of new lock requests that originate on this system and are performed on other systems (outgoing) (longword,C)
ENQ Conversions Local	MNR_CLU$L_ENQCVTLOC	Count of lock conversion requests (local) (longword,C)
ENQ Conversions Incoming	MNR_CLU$L_ENQCVTIN	Count of lock conversion requests (incoming) (longword,C)
ENQ Conversions Outgoing	MNR_CLU$L_ENQCVTOUT	Count of lock conversion requests (outgoing) (longword,C)
DEQ Local	MNR_CLU$L_DEQLOC	Count of unlock requests (local) (longword,C)
DEQ Incoming	MNR_CLU$L_DEQIN	Count of unlock requests (incoming) (longword,C)
DEQ Outgoing	MNR_CLU$L_DEQOUT	Count of unlock requests (outgoing) (longword,C)

H.4.2.2 DECNET Class Record

The DECNET class record contains data describing the operation of the DECnet for OpenVMS subsystem. The DECNET class record has a record type of 8 and a size of 36 bytes.

Figure H-9 illustrates the format of the DECNET class record.

Figure H-9 DECNET Class Record Format

The following table describes the fields in the data block for the DECNET class record:

Field	Symbolic Offset	Contents
Arriving Local Packets	MNR_NET$L_ARRLOCPK	Count of arriving local packets (longword,C)
Departing Local Packets	MNR_NET$L_DEPLOCPK	Count of departing local packets (longword,C)
Arriving Transit Packets	MNR_NET$L_ARRTRAPK	Count of arriving transit packets (longword,C)
Transit Packets Lost	MNR_NET$L_TRCNGLOS	Count of packets lost because of transit congestion (longword,C)
Receiver Buffer Failures	MNR_NET$L_RCVBUFFL	Count of receiver buffer failures (longword,C)

H.4.2.3 DISK Class Record

The DISK class record contains data describing all disk devices in the system. The DISK class record has a record type of 12; its size depends on the number of disks being monitored. The size, in bytes, is calculated by adding the size of the class header, the class prefix, and the data blocks contained in the record. This is shown in the following formula:

16 + 8 + (44 * the value of MNR_CMP$L_ELTCT)

Figure H-10 illustrates the format of the DISK class record on Alpha and Integrity servers.

Figure H-10 DISK Class Record Format - Alpha and Integrity servers

The following table describes the fields in the data block for the DISK class record:

Field	Symbolic Offset	Contents
Allocation Class	MNR_DSK$W_ALLOCLS	Allocation class number (word,I)
Controller	MNR_DSK$T_CTRLR	Name of device controller (counted ASCII string) (4 bytes,I)
Unit Number	MNR_DSK$W_UNITNO	Unit number (word,I)
Flags	MNR_DSK$B_FLAGS	Total of 8 flag bits; if the low bit is set, the device is served by the MSCP server (byte,I)
Spare	MNR_DSK$L_SPARE1	Reserved for future use
Node Name	MNR_DSK$T_NODENAME	Name of cluster node where device resides (counted ASCII string) (8 bytes,I)
Volume Name	MNR_DSK$T_VOLNAME	Volume name of disk (ASCII) (12 bytes,I)
Operations	MNR_DSK$L_OPCNT	Count of I/O operations (longword,C)
Queue Length	MNR_DSK$L_IOQUELN	Sum of I/O request queue samples (longword,C)

H.4.2.4 DLOCK Class Record

The DLOCK class record contains data describing the operation of the Distributed Lock Management facility. The DLOCK class record has a record type of 14 and a size of 76 bytes.

Figure H-11 illustrates the format of the DLOCK class record.

Figure H-11 DLOCK Class Record Format

The following table describes the fields in the data block for the DLOCK class record:

Field	Symbolic Offset	Contents
New Locks ---Local	MNR_DLO$L_ENQNEWLOC	Count of new lock requests that originate and are performed on this system (local) (longword,C)
New Locks ---Incoming	MNR_DLO$L_ENQNEWIN	Count of new lock requests originating on another system and performed on this system (incoming) (longword,C)
New Locks ---Outgoing	MNR_DLO$L_ENQNEWOUT	Count of new lock requests originating on this system and performed on another system (outgoing) (longword,C)
Lock Conversions ---Local	MNR_DLO$L_ENQCVTLOC	Count of lock conversion requests (local) (longword,C)
Lock Conversions ---Incoming	MNR_DLO$L_ENQCVTIN	Count of lock conversion requests (incoming) (longword,C)
Lock Conversions ---Outgoing	MNR_DLO$L_ENQCVTOUT	Count of lock conversion requests (outgoing) (longword,C)
Unlocks---Local	MNR_DLO$L_DEQLOC	Count of unlock requests (local) (longword,C)
Unlocks---Incoming	MNR_DLO$L_DEQIN	Count of unlock requests (incoming) (longword,C)
Unlocks---Outgoing	MNR_DLO$L_DEQOUT	Count of unlock requests (outgoing) (longword,C)
Blocking ASTs ---Local	MNR_DLO$L_BLKLOC	Count of lock manager blocking ASTs (local) (longword,C)
Blocking ASTs ---Incoming	MNR_DLO$L_BLKIN	Count of lock manager blocking ASTs (incoming) (longword,C)
Blocking ASTs ---Outgoing	MNR_DLO$L_BLKOUT	Count of lock manager blocking ASTs (outgoing) (longword,C)
Directory Functions ---Incoming	MNR_DLO$L_DIRIN	Count of directory functions (incoming) (longword,C)
Directory Functions ---Outgoing	MNR_DLO$L_DIROUT	Count of directory functions (outgoing) (longword,C)
Deadlock Message Rate	MNR_DLO$L_DLCKMSG	Count of incoming and outgoing lock manager messages required for deadlock detection (longword,C)

H.4.2.5 FCP Class Record

The FCP class record contains data describing the operation of the file system ACPs. The FCP class record has a record type of 5 and a size of 64 bytes.

Figure H-12 illustrates the format of the FCP class record.

Figure H-12 FCP Class Record Format

The following table describes the fields in the data block for the FCP class record:

Field	Symbolic Offset	Contents
FCP Calls	MNR_FCP$L_FCPCALLS	Count of QIO requests received by the file system (longword,C)
Disk Allocations	MNR_FCP$L_ALLOC	Count of QIO requests that caused allocation of disk space (longword,C)
New Files	MNR_FCP$L_FCPCREATE	Count of new files created (longword,C)
Read I/Os	MNR_FCP$L_FCPREAD	Count of read I/O operations from the disk by the file system (longword,C)
Write I/Os	MNR_FCP$L_FCPWRITE	Count of write I/O operations to disk by the file system (longword,C)
Volume Lock Waits	MNR_FCP$L_VOLWAIT	Number of times a wait state was entered by the XQP due to volume lock contention (longword,C)
CPU Time	MNR_FCP$L_FCPCPU	Count of clock ticks (10-millisecond units) of CPU time used by the file system (longword,C)
FCP Page Faults	MNR_FCP$L_FCPFAULT	Count of page faults for the file system (longword,C)
Window Turns	MNR_FCP$L_FCPTURN	Count of file-map window misses (longword,C)
Access	MNR_FCP$L_ACCESS	Count of file name lookup operations in file directories (longword,C)
Files Opened	MNR_FCP$L_OPENS	Count of files opened (longword,C)
Erase I/O Operations	MNR_FCP$L_ERASE	Count of erase I/O operations issued (longword,C)

H.4.2.6 FILE_SYSTEM_CACHE Class Record

The FILE_SYSTEM_CACHE class record contains data describing the operation of the caches for the file system ACPs and XQPs. The FILE_SYSTEM_CACHE class record has a record type of 11 and a size of 72 bytes.

Figure H-13 illustrates the format of the FILE_SYSTEM_CACHE class record.

Figure H-13 FILE_SYSTEM_CACHE Class Record Format

The following table describes the fields in the data block for the FILE_SYSTEM_CACHE class record:

Field	Symbolic Offset	Contents
Directory FCB Cache Hits	MNR_FIL$L_DIRFCB_HIT	Count of hits on directory FCB cache (longword,C)
Directory FCB Cache Attempts	MNR_FIL$L_DIRFCB_TRIES	Count of attempts on directory FCB cache (longword,C)
Directory Data Cache Hits	MNR_FIL$L_DIRDATA_HIT	Count of hits on directory data cache (longword,C)
Directory Data Cache Attempts	MNR_FIL$L_DIRDATA_TRIES	Count of attempts on directory data cache (longword,C)
File Header Cache Hits	MNR_FIL$L_FILHDR_HIT	Count of hits on file header cache (longword,C)
File Header Cache Attempts	MNR_FIL$L_FILHDR_TRIES	Count of attempts on file header cache (longword,C)
File ID Cache Hits	MNR_FIL$L_FIDHIT	Count of hits on file ID cache (longword,C)
File ID Cache Attempts	MNR_FIL$L_FID_TRIES	Count of attempts on file ID cache (longword,C)
Extent Cache Hits	MNR_FIL$L_EXTHIT	Count of hits on extent cache (longword,C)
Extent Cache Attempts	MNR_FIL$L_EXT_TRIES	Count of attempts on extent cache (longword,C)
Quota Cache Hits	MNR_FIL$L_QUOHIT	Count of hits on quota cache (longword,C)
Quota Cache Attempts	MNR_FIL$L_QUO_TRIES	Count of attempts on quota cache (longword,C)
Storage Bitmap Cache Hits	MNR_FIL$L_STORAGMAP_HIT	Count of hits on storage bitmap cache (longword,C)
Storage Bitmap Cache Attempts	MNR_FIL$L_STORAGMAP_TRIES	Count of attempts on storage bitmap cache (longword,C)

H.4.2.7 I/O Class Record

The I/O class record contains data describing the operation of the I/O subsystem. The I/O class record has a record type of 4 and a size of 72 bytes.

Figure H-14 illustrates the format of the I/O class record.

Figure H-14 I/O Class Record Format

The following table describes the fields in the data block for the I/O class record:

Field	Symbolic Offset	Contents
Direct I/Os	MNR_IO$L_DIRIO	Count of direct I/O operations (longword,C)
Buffered I/Os	MNR_IO$L_BUFIO	Count of buffered I/O operations (longword,C)
Mailbox Writes	MNR_IO$L_MBWRITES	Count of write-to-mailbox requests (longword,C)
Split Transfers	MNR_IO$L_SPLTRANS	Count of split transfers (longword,C)
Logical Name Translations	MNR_IO$L_LOGNAM	Count of logical name translations (longword,C)
Files Opened	MNR_IO$L_OPENS	Count of files opened (longword,C)
Page Faults	MNR_IO$L_FAULTS	Count of page faults for all working sets (longword,C)
Page Reads	MNR_IO$L_PREADS	Count of pages read from disk as a result of page faults (longword,C)
Page Read I/Os	MNR_IO$L_PREADIO	Count of read I/O operations from disk as a result of page faults (longword,C)
Page Writes	MNR_IO$L_PWRITES	Count of pages written to the page file (longword,C)
Page Write I/Os	MNR_IO$L_PWRITIO	Count of write I/O operations to the page file (longword,C)
Inswaps	MNR_IO$L_ISWPCNT	Count of working sets read into memory from the swap file (longword,C)
Free Page Count	MNR_IO$L_FREECNT	Number of pages currently on free-page list (longword,L)
Modified Page Count	MNR_IO$L_MFYCNT	Number of pages currently on modified-page list (longword,L)