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HP OpenVMS Systems Documentation

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Compaq Availability Manager User's Guide


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3.2.3.3 OpenVMS Memory Details

When you click the View menu on the OpenVMS Memory Summary page (see Figure 3-9), the following options are displayed in a popup menu:

  • Memory Summary View
  • Memory Details View

To display memory details, select that option. The Availability Manager displays the OpenVMS Memory Details page (Figure 3-10).

Figure 3-10 OpenVMS Memory Details Page


The following data items are in a box at the top left of the page:

Heading Description
Successful Expansions Number of successful nonpaged pool expansions.
Failed Expansions Number of failed attempts to expand nonpaged pool.
System space replication Whether system space replication is enabled or disabled.

To the right of the box is a list of system memory data that is displayed in the bar graphs at the bottom of the page. You can toggle these data items on or off (that is, to display them or not to display them as bar graphs). You can also click a small box to choose between Linear and Logarithmic bar graph displays.

The system memory data items are described in Table 3-4.

Table 3-4 System Memory Data
Data Description
Total memory Total physical memory size, as seen by OpenVMS.
Available process memory Amount of total physical memory available to processes. This is the total memory minus memory allocated to OpenVMS.
Free list Size of the free page list.
Modified list Size of the modified page list.
Resident code region Size of the resident image code region.
Reserved page count Number of reserved memory pages.
Galactic shared used Galaxy shared memory pages currently in use.
Galactic shared unused Galaxy shared memory pages currently not in use.
Global read-only Read-only pages, which are installed as resident when system space replication is enabled, that will also be replicated for improved performance.
Total nonpaged pool Total size of system nonpaged pool.
Total free nonpaged pool Amount of nonpaged pool that is currently free.

To the right of the system memory data is a list of single RAD data items, which are described in Table 3-5. You can toggle these items to display them or not in bar graphs.

Table 3-5 Single RAD Data Items
Data Description
Free list Size of the free page list.
Modified list Size of the modified page list.
Nonpaged pool Total size of system nonpaged pool.
Free nonpaged pool Amount of nonpaged pool that is currently free.

Below the list of single RAD items is a box where you can toggle between Percentage and Raw Data to display Current and Extreme values to the right of the bar graphs.

3.2.4 OpenVMS I/O Summaries and Page/Swap Files

By clicking the I/O tab on any OpenVMS node data page, you can display a page that contains summaries of accumulated I/O rates. In the top pane, the summary covers all processes; in the bottom pane, the summary is for one process.

From the View menu, you can also choose to display (in the bottom pane) a list of page and swap files.

3.2.4.1 OpenVMS I/O Summaries

The OpenVMS I/O Summaries page displays the rate, per second, at which I/O transfers take place, including paging write I/O (WIO), direct I/O (DIO), and buffered I/O (BIO). In the top pane, the summary is for all CPUs; in the bottom pane, the summary is for one process.

When you double-click a data item under the DIO or BIO heading on the Node pane, or if you click the I/O tab, the Availability Manager displays, by default, the OpenVMS I/O Summaries (Figure 3-11).

Figure 3-11 OpenVMS I/O Summaries Page


The graph in the top pane represents the percentage of thresholds for the types of I/O shown in Table 3-6. The table also shows the event that is related to each data item. (Refer to Section 7.5 for information about setting event thresholds.)

Table 3-6 I/O Data Displayed
Type of I/O I/O Description Related Event
Paging Write I/O Rate Rate of write I/Os to one or more paging files. HIPWIO
Direct I/O Rate Transfers are from the pages or pagelets containing the process buffer that the system locks in physical memory to the system devices. HIDIOR
Buffered I/O Rate Transfers are for the process buffer from an intermediate buffer from the system buffer pool. HIBIOR
Total Page Faults Total of hard and soft page faults on the system, as well as peak values seen during an Availability Manager session. HITTLP
Hard Page Faults Total of hard page faults on the system. HIHRDP
System Page Faults Page faults that are taken from kernel processes. HISYSP

Current and peak values are listed for each type of I/O. Values that exceed thresholds set by the events indicated in the table are displayed in red on the screen. Appendix B describes OpenVMS and Windows events.

To the right of the graph, the following values are listed:

Value Description
Threshold Defined in Event Properties.
Current Current value or rate.
Peak Highest value or rate seen since start of data collection.

The bottom pane displays summary accumulated I/O rates on a per-process basis. The following data is displayed:

Data Description
PID Process identifier. A 32-bit value that uniquely identifies a process.
Process Name Name of the current process.
DIO Rate Direct I/O rate. The rate at which I/O transfers occur between the system devices and the pages or pagelets that contain the process buffer that the system locks in physical memory.
BIO Rate Buffered I/O rate. The rate at which I/O transfers occur between the process buffer and an intermediate buffer from the system buffer pool.
PIO Rate Paging I/O rate. The rate of read attempts necessary to satisfy page faults (also known as page read I/O or the hard fault rate).
Open Files Number of open files.
DIO Avail Direct I/O limit remaining. The number of remaining direct I/O limit operations available before the process reaches its quota. DIOLM quota is the maximum number of direct I/O operations a process can have outstanding at one time.
BIO Avail Buffered I/O limit remaining. The number of remaining buffered I/O operations available before the process reaches its quota. BIOLM quota is the maximum number of buffered I/O operations a process can have outstanding at one time.
BYTLM The number of buffered I/O bytes available before the process reaches its quota. BYTLM is the maximum number of bytes of nonpaged system dynamic memory that a process can claim at one time.
Files Open file limit remaining. The number of additional files the process can open before reaching its quota. The FILLM quota is the maximum number of files that can be opened simultaneously by the process, including active network logical links.

When you double-click a PID on the lower part of the I/O Summaries page, the Availability Manager displays an OpenVMS Single Process, where you can click tabs to display specific data about one process. See Section 3.3 for more details.

3.2.4.2 OpenVMS I/O Page/Swap Files

Click I/O Page/Swap Files on the I/O page View menu to select this option. The Availability Manager displays an OpenVMS I/O Page/Swap Files page. The top pane displays the same information as that in the OpenVMS I/O Summaries page (Figure 3-11). The bottom pane contains the I/O Page/Swap Files Pane shown in Figure 3-12.

Figure 3-12 OpenVMS I/O Page/Swap Files Pane


The I/O Page/Swap Files Pane displays the following data:

Data Description
Host Name Name of the node on which the page or swap file resides.
File Name Name of the page or swap file. For secondary page or swap files, the file name is obtained by a special AST to the job controller on the remote node. The Availability Manager makes one attempt to retrieve the file name.
Used Number of used blocks in the file.
% Used Of the available blocks in each file, the percentage that has been used.
Total Total number of blocks in the file.
Reservable The number of reservable blocks in each page or swap file currently installed. Reservable blocks are blocks that might be logially claimed by a process for future physical allocation. A negative value indicates that the file might be overcommitted. Although a negative value is not an immediate concern, it indicates that the file might become overcommitted if physical memory becomes scarce.

3.2.5 Disk Summaries

The Disk tab allows you to display disk pages that contain data about availability, count, and errors of disk devices on the system. OpenVMS disk data displays differ from those for Windows nodes, as described in the following sections.

On OpenVMS pages, the View menu lets you choose the following disk summaries:

  • Status Summary
  • Volume Summary

Also, on the Disk Status Summary, you can double-click a device name to display a Single Disk Summary page.

3.2.5.1 OpenVMS Disk Status Summary

To display the default disk page, the OpenVMS Disk Status Summary (Figure 3-13), click the Disk tab on the OpenVMS Node Summary page. The Disk Status Summary page displays disk device data, including path, volume name, status, and mount, transaction, error, and resource wait counts.

Figure 3-13 OpenVMS Disk Status Summary


This summary displays the following data:

Heading Description
Device Name Standard OpenVMS device name that indicates where the device is located, as well as a controller or unit designation.
Host Path Primary path (node) from which the device receives commands.
Volume Name Name of the mounted media.
Status One or more of the following disk status values:
Alloc Disk is allocated to a specific user.
CluTran Disk status is uncertain because of a cluster state transition in progress.
Dismount Disk in process of dismounting; may be waiting for a file to close.
Foreign Disk is mounted with the /FOREIGN qualifier.
Invalid Disk is in an invalid state (most likely Mount Verify Timeout).
MntVerify Disk is waiting for a mount verification.
Mounted Disk is logically mounted by a MOUNT command.
Offline Disk is no longer physically mounted in device drive.
Online Disk is physically mounted in device drive.
Shadow Set Member Disk is a member of a shadow set.
Unavailable Disk is set to unavailable.
Wrong Volume Disk was mounted with the wrong volume name.
Wrtlck Disk is mounted and write locked.
Error Number of errors generated by the disk (a quick indicator of device problems).
Trans Number of in-progress file system operations for the disk.
Mount Number of nodes that have the specified disk mounted.
Rwait Indicator that a system I/O operation is stalled, usually during normal recovery from a connection failure or during volume processing of host-based shadowing.

3.2.5.2 OpenVMS Single Disk Summary

To collect single disk data and display the data on the Single Disk Summary, double-click a device name on the Disk Status Summary. Figure 3-14 is an example of a Single Disk Summary page. The display interval of the data collected is 5 seconds.

Figure 3-14 OpenVMS Single Disk Summary Page


This summary displays the following data:

Data Description
Node Name of the node.
Status Status of the disk: mounted, online, offline, and so on.
Errors Number of errors on the disk.
Trans Number of in-progress file system operations on the disk (number of open files on the volume).
Rwait Indication of an I/O stalled on the disk.
Free Number of free disk blocks on the volume.
QLen Average number of operations in the I/O queue for the volume.
OpRate Each node's contribution to the total operation rate (number of I/Os per second) for the disk.

3.2.5.3 OpenVMS Disk Volume Summary

By using the View option on the Disk Status Summary page (Figure 3-13), you can select the Volume Summary option to display the OpenVMS Disk Volume Summary (Figure 3-15). This page displays disk volume data, including path, volume name, disk block utilization, queue length, and operation rate.

Figure 3-15 OpenVMS Disk Volume Summary Page


This summary displays the following data:

Data Description
Device Name Standard OpenVMS device name that indicates where the device is located, as well as a controller or unit designation.
Host Path Primary path (node) from which the device receives commands.
Volume Name Name of the mounted media.
% Used Percentage of the number of volume blocks in use in relation to the total volume blocks available.
Free Number of blocks of volume space available for new data from the perspective of the node that is mounted.
Queue Average number of I/O operations pending for the volume (an indicator of performance; less than 1.00 is optimal).
OpRate Operation rate for the most recent sampling interval. The rate measures the amount of activity on a volume. The optimal load is device specific.

Windows Logical and Physical Disk Summaries

On Windows nodes, the View menu lets you choose the following summaries:

  • Logical Disk Summary
  • Physical Disk Summary

3.2.5.4 Windows Logical Disk Summary

A logical disk is the user-definable set of partitions under a drive letter. The Windows Logical Disk Summary displays logical disk device data, including path, label, percentage used, free space, and queue statistics.

To display the Logical Disk Summary page, follow these steps:

  1. Double-click a node name in the Node pane to display the Windows Node Summary.
  2. Click the Disk tab on the Windows Node Summary.

The Availability Manager displays the Windows Logical Disk Summary page (Figure 3-16).

Figure 3-16 Windows Logical Disk Summary Page


This summary displays the following data:

Data Description
Disk Drive letter, for example, c:, or Total, which is the summation of statistics for all the disks.
Path Primary path (node) from which the device receives commands.
Label Identifying label of a volume.
Type File system type; for example, FAT or NTFS.
% Used Percentage of disk space used.
Free Amount of free space available on the logical disk unit.
Current Queue Number of requests outstanding on the disk at the time the performance data is collected. It includes requests in progress at the time of data collection.
Average Queue Average number of both read and write requests that were queued for the selected disk during the sample interval.
Transfers/Sec Rate of read and write operations on the disk.
KBytes/Sec Rate data is transferred to or from the disk during write or read operations. The rate is displayed in kilobytes per second.
% Busy Percentage of elapsed time that the selected disk drive is busy servicing read and write requests.


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