HFS File System Statistics screen
The HFS File System Statistics screen displays information about storage usage and I/O activity for a single HFS file system.
This screen is not exportable using the EXPORT command.
This screen cannot be customized.
COMMAND ===> SYSTEM ===> SJSC
CPU 31/ 29 UIC 2540 Paging 0 ES Mig Age N/A Time 13:31:08 Mode TOTAL
File System: BBO.V60.SJSC.BASE.CONFHFS
Mount Date: 2008/07/02 Time: 02:45:35 Duration: 10:45:33
-------------------- Allocation (MB) ------------------ -- Index Events ---
Total 497 In use 399 % Used 80.40 % Splits 333
Data 475 Cache 29 New Levels 3
Attr.Dir 21 Joins 0
---- File I/O ---- -- Metadata I/O -- --- Index I/O ---
Count Rate Count Rate Count Rate
DASD 377,301 9.7411 18,686 0.4824 3,655 0.0944
Cache 151,682 3.9161 7,439.7K 192.0771 8,637.8K 223.0100
Cache Hits 28.67 % 99.75 % 99.96 %
Sequential 673 0.0174
Random 3,117 0.0805
The following table lists the header; whether the column appears in Total mode, Delta mode, or both modes; and a brief description of each column in this screen.
Column header | Mode | Description | |
|---|---|---|---|
File System | Both | displays the 44-character dataset name of the file system | |
Mount Date | Both | displays the date the file system was mounted | |
Time | Both | displays the time the file system was mounted | |
Duration | Total | displays the elapsed time since the file system was mounted The format can be in days and hours (6D 19H) or as HH:MM:SS. | |
Delta | displays the elapsed time between two consecutive pressings of the Enter key The format can be in days and hours (6D 19H) or as HH:MM:SS. | ||
Allocation (MB) | these fields display how storage is being used by the file system, as follows: | ||
Total | Both | displays the number of megabytes allocated to the file system | |
In Use | Both | displays the number of megabytes in use by the file system | |
% Used | Both | displays the percent of total allocated space actually used | |
Data | Both | displays the number of megabytes used for data files, directories, and internal structures such as the attribute directory | |
Cache | Both | displays the number of megabytes used to cache data buffers | |
Attr. Dir | Both | displays the number of megabytes used for the attribute directory | |
Index Events | these fields display index activity information, as follows: | ||
Splits | Both | displays a count of how often HFS split an index page into two pages Splits occurs when index records must be inserted into an index page and the page is full. This number reflects insertion activity for the file system. | |
New Levels | Both | displays a count of how often HFS added a new level to its index structure The index statistics are relative to all of the indices in the HFS file system. The attribute directory is one index, and each directory (including the root) is also an index. | |
Joins | Both | displays a count of how often HFS was able to recombine two index pages into one A join occurs when enough index records have been deleted in the two pages. This number reflects deletion activity for the file system. | |
File I/O | these fields display file activity, as follows: | ||
Count | Both | number of times the first page of a data file was found in cache or on DASD | |
Rate | Both | number of I/O requests per second | |
Cache Hits | Both | percentage of I/O requests serviced from the cache | |
Sequential | Both | displays an I/O count and rate for sequential accesses | |
Random | Both | displays an I/O count and rate for random accesses | |
Metadata I/O | these fields display metadata activity, as follows: | ||
Count | Both | number of times the metadata for a file was found in cache or on DASD | |
Rate | Both | number of metadata I/O requests per second for DASD and cache | |
Cache Hits | Both | percentage of I/O requests serviced from the cache | |
Index I/O | these fields display index activity, as follows: | ||
Count | Both | number of times that an index page was read or written, from cache and from DASD | |
Rate | Both | number of index I/O requests per second | |
Cache Hits | Both | percentage of I/O requests serviced from the cache | |
The SENQR control statement produces the Enqueue Reserve (SENQR) Report. The header of this report shows the date and time the data was collected. Each row in this report reflects a currently outstanding reserve request.
The following figure is an example of the Enqueue Reserve (SENQR) Report.
BMC SOFTWARE, INC. XYZ COMPANY REPORT DATE: MM/DD/YY HH:MM:SS
MM/DD/YY HH:MM:SS SYSTEM: SYSB SYSB Z v.rr.n
CPU= 38/ 36 UIC= 73 PAGING= 0 ES MIG AGE= 77866
JOBNAME ASID SYSTEM REQ VOLSER DEV RSV MAJOR MINOR
JES2 501 SYSB EO SYSP10 010A1 OFF SYSZJES2 SYSP10SYS1.HASPCPB1
The following table lists the header, ID (used when specifying keywords), and a brief description of each column in this report.
Column header | Column ID | Description |
|---|---|---|
JOBNAME | JOBNAME | Name of the address space |
ASID | ASID | Address space identifier of the job that has the requested resource |
SYSTEM | SYSTEM | System on which the job that owns the requested resource is running |
REQ | REQ | Request type for the resource and status of the request |
VOLSER | VOLSER | Volume serial of the volume mounted on the device |
DEV | DEV | Device number of the device for which the reserve was issue, which includes the subchannel set ID. (snnnn) - 's' is the subchannel set ID and 'nnnn' is the device number. |
RSV | RSV | Reserve status of the device |
MAJOR | MAJOR | Major queue name of the resource |
MINOR | MINOR | Minor queue name of the resource |
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