HP OpenVMS Availability Manager User's Guide

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 Summary page (Figure 3-12). The lower pane contains the I/O Page/Swap Files pane shown in Figure 3-13.

Figure 3-13 OpenVMS I/O Page/Swap Files

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.

The Disk tab on the Node Summary page (Figure 3-4) 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 page (Figure 3-14), click the Disk tab on the OpenVMS Node Summary page (Figure 3-4). The Disk Status Summary page displays disk device data, including path, volume name, status, and mount, transaction, error, and resource wait counts.

Figure 3-14 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. (These nodes must have the Data Collector installed and running to be participate in the mount count.)
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 3-15 is an example of a Single Disk Summary page. The display interval of the data collected is 5 seconds.

Note that you can sort the order in which data is displayed in the Single Disk Summary page by clicking a column header. To reverse the sort order of a column of data, click the column header again.

Figure 3-15 OpenVMS Single Disk Summary

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 3-14), you can select the Volume Summary option to display the OpenVMS Disk Volume Summary (Figure 3-16). This page displays disk volume data, including path, volume name, disk block utilization, queue length, and operation rate.

Figure 3-16 OpenVMS Disk Volume Summary

The Disk Volume Summary page displays the data described in the following table. (The last two columns, Volume Size and Volume Limit, are displayed only on OpenVMS Version 7.3-2 and later systems.)

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	Number of blocks on the volume that are in use.
% 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.
Physical Size	Total number of blocks on the current physical disk device. This is the "Total Blocks" field of the $SHOW DEVICE/FULL display
Volume Size	Current number of blocks available for file allocation. This is the "Logical Volume Size" field of the $SHOW DEVICE/FULL display. (For more information, see $SET VOLUME/SIZE.) This column is displayed only on OpenVMS Version 7.3-2 and later systems.
Volume Limit	Maximum number of blocks the volume can reach using Dynamic Volume Expansion. This is the "Expansion Size Limit" of $SHOW DEVICE/FULL display. (For more information, see $SET VOLUME/LIMIT.) This column is displayed only on OpenVMS Version 7.3-2 and later systems.

If the Availability Manager detects that a disk volume size has increased, an VLSZCH event is signalled:

AFFS55 Volume size of device $8$DKA200 (OPAL-X9U6) has changed ^ ^ ^ Node Device Volume name name name

3.2.5.4 Windows Logical and Physical Disk Summaries

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

• Logical Disk Summary
• Physical Disk Summary

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 3-17).

Figure 3-17 Windows Logical Disk Summary

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.

Windows Physical Disk Summary

A physical disk is hardware used on your computer system. The Windows Physical Disk Summary displays disk volume data, including path, label, queue statistics, transfers, and bytes per second.

To display the Windows Physical Disk Summary, follow these steps:

1. Click the View menu on the Windows Logical Disk Summary.
2. Click the Physical Disk Summary menu option.

The Availability Manager displays the Windows Physical Disk Summary page (Figure 3-18).

Figure 3-18 Windows Physical Disk Summary

This page displays the following data:

Data	Description
Disk	Drive number, for example, 0, 1, 2 or Total, which is the summation of statistics for all the disks.
Path	Primary path (node) from which the device receives commands.
Current Queue	Number of requests outstanding on the disk at the time the performance data is collected; it includes requests in service at the time of data collection.
Average Queue	Average number of 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. The rate is displayed in kilobytes per second.
KBytes/Sec	Rate bytes are transferred to or from the disk during read or write operations. The rate is displayed in kilobytes per second.
% Busy	Percentage of elapsed time the selected disk drive is busy servicing read and write requests.
% Read Busy	Percentage of elapsed time the selected disk drive is busy servicing read requests.
% Write Busy	Percentage of elapsed time the selected disk drive is busy servicing write requests.

3.2.6 OpenVMS Lock Contention

To display the OpenVMS Lock Contention page, click the Lock Contention tab on the OpenVMS Node Summary page (Figure 3-4). For all the nodes in the group you have selected, the Lock Contention page displays each resource for which a lock contention problem might exist.

Figure 3-19 shows a sample Lock Contention page containing resource names in decoded format, which is the default.

Figure 3-19 OpenVMS Lock Contention (Decoded Format)

(You can display a tooltip similar to the one shown in Figure 3-19 by holding the cursor on a resource line. See the Note in the introduction to this chapter for further details.)

By selecting the View menu (on the Lock Contention page), followed by the Resource names menu item, you can choose to display the resource name and parent resource name in either of two formats:

• Raw format (the format that SDA uses)
• Decoded format (the default format)

Figure 3-19 displays the resource names in decoded format. (The Availability Manager decodes common resource names.)

The Lock Contention page displays the data described in Table 3-8. Numbered lines correspond to lines or items of data in the Lock Contention Log (Example 3-1).

Table 3-8 Data on the OpenVMS Lock Contention Page

Lock Log Reference Number	Data	Description
1	Resource Name	Resource name associated with the $ENQ system service call.
2	Master Node	Node on which the resource is mastered.
3	Parent Resource	Name of the parent resource. No name is displayed when a parent resource does not exist.
4	Duration	Time elapsed since the Availability Manager first detected the contention situation.
5	Gr/Cv/Wt/St	Total number of locks in each of four states. Numbers for these states appear only when you are collecting lock data. The states are: Granted Converting Waiting Stalled Stalled indicates one of several states whenever a lock is waiting for a response from another node in the cluster.
6	Status	Status of the lock. See the $ENQW description of flags in the HP OpenVMS System Services Reference Manual.

The tooltip that is displayed when you hold the cursor over a line of data in Figure 3-19 contains the data described in Table 3-8, as well as the information described in Table 3-9.

Table 3-9 Lock Contention Tooltip Data

Reference Number	Data	Description
7	RSB	Address of the Resource Block
8	ValBlk dump	Resource Value Block dump in standard OpenVMS dump format

3.2.6.2 Lock Contention Page in Raw Format

Figure 3-20 shows the Lock Contention page with resource name data displayed in raw format. It also shows the tooltip that is displayed when you hold the cursor over a line of data.

Figure 3-20 OpenVMS Lock Contention (Raw Format)

In Figure 3-20, notice that a period is substituted for each unprintable character in the Resource Name and Parent Resource Name fields.

3.2.6.3 Lock Block Data

When you click the handle that precedes any line of resource data, the Availability Manager displays the lock block data that is shown in Figure 3-21 and Figure 3-22.

Figure 3-21 OpenVMS Lock Block Data

Figure 3-22 OpenVMS Lock Block Data (Retry Stalled State)

The lock block data in these two figures includes additional lock information under the headings shown in Table 3-10. Numbered lines correspond to lines or items of data in the Lock Contention Log (Example 3-1).

Table 3-10 Lock Block Data

Reference Number	Data	Description
9	Node	Node name on which the lock is granted.
10	State	One of the following: Color Meaning Green Granted Yellow Converting Pink Waiting Pale grey Stalled states that are visible: SCSWAIT: A transient state indicating that a lock message has been sent to the node with the master lock and a response is awaited. RETRY: A transient state seen only under error conditions that require that a lock message be resent. This can occur if the node to which a lock message was sent goes down before a response from it is received or if resources for sending a message cannot be allocated.
11	Process Name	Name of the process that owns the blocking lock.
12	LKID	Lock ID value (which is useful with SDA).
13	Mode	One of the following modes in which the lock is granted or requested: 1 CR Concurrent read Grants read access and allows resource sharing with other readers and writers. CW Concurrent write Grants write access and allows resource sharing with other groups. EX Exclusive Grants write access and prevents resource sharing with any other readers or writers. NL Null Grants no access; used as an indicator of interest or a placeholder for future lock conversion. PR Protected read Grants read access and allows resource sharing with other readers, but not writers. PW Protected write Grants write access and prevents resource sharing with any other readers or writers. If one mode is displayed, it is the Granted mode; if two modes are displayed, the first is the Granted mode and the second is the Converting mode.
14	Duration	Length of time the lock has been in the current queue since the console application found the lock.
15	Flags	Flags specified with the $ENQW request. See the $ENQW entry in HP OpenVMS System Services Reference Manual.