Compaq 1850R - ProLiant - 128 MB RAM Manuel utilisateur

White Paper

December 1998

ECG001/1298

Prepared by High Availability

Products Group

Compaq Computer Corporation

Contents

Managing Changes to Drive

Ordering .....................................3

Symptoms................................3

When does this situation

occur?......................................3

Preventing the Issue .................4

Simplifying Detection of the

Issue........................................4

What Oracle Component is

Affected?..................................4

Removing a Shared Storage

Array...........................................8

Adding a Shared Storage

Array...........................................9

Adding or Removing Drives

from a Shared Storage Array ...11

Replacing a Failed Drive.........11

Adding a Drive to Increase

Storage Capacity....................12

Modifying Physical Cluster

Resources in a Compaq Parallel

Database Cluster

Abstract: At some time during the life of a Compaq Parallel

Database Cluster it is likely that some modifications to the physical

resources of the cluster will be required. This paper describes how to

perform some of the more likely modifications, such as:

•Managing Changes to Drive Ordering

•Removing a Shared Storage Array

•Adding a Shared Storage Array

•Adding or Removing Shared Storage Drives

Additional scenarios are described in Chapter 5 of the Compaq

Parallel Database Cluster Administrator Guide.

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 2

ECG001/1298

Notice

The information in this publication is subject to change without notice and is provided “AS IS” WITHOUT

WARRANTY OF ANY KIND. THE ENTIRE RISK ARISING OUT OF THE USE OF THIS

INFORMATION REMAINS WITH RECIPIENT. IN NO EVENT SHALL COMPAQ BE LIABLE FOR

ANY DIRECT, CONSEQUENTIAL, INCIDENTAL, SPECIAL, PUNITIVE OR OTHER DAMAGES

WHATSOEVER (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS

PROFITS, BUSINESS INTERRUPTION OR LOSS OF BUSINESS INFORMATION), EVEN IF

COMPAQ HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

The limited warranties for Compaq products are exclusively set forth in the documentation accompanying

such products. Nothing herein should be construed as constituting a further or additional warranty.

This publication does not constitute an endorsement of the product or products that were tested. The

configuration or configurations tested or described may or may not be the only available solution. This test

is not a determination or product quality or correctness, nor does it ensure compliance with any federal

state or local requirements.

Product names mentioned herein may be trademarks and/or registered trademarks of their respective

companies.

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Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster

White Paper prepared by High Availability Products Group

First Edition (December 1998)

Document Number ECG001/1298

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 3

ECG001/1298

Managing Changes to Drive Ordering

The Compaq Parallel Database Cluster encounters difficulties when the order in which drives are

brought online changes. For the drives associated with the fibre channel arrays, NT assigns disk

numbers based on the order in which the arrays are powered on. Oracle uses these disk number

assignments via the links created with the SETLINKS utility. The order in which drives are

brought online directly affects the disk numbers assigned to the disks, which in turn affects

whether Oracle8 Server can find its database files.

Symptoms

The primary symptom of this issue is that the database will not start up correctly. Some other

symptoms that might be seen are:

•The user may see Oracle errors when trying to mount the database.

•The database will mount correctly, however, the data will not be correct.

•The PGMS service will not start.

•When using Windows NT disk administrator to see the disk configuration:

•one or more of the disks associated with the shared storage will not be seen or will be

marked off-line; or

•the disks will be shown in the wrong order

When does this situation occur?

The situation occurs when the order in which the database’s drives are brought online is different

than the order in which the drives were brought online when the database cluster was originally

set up. Following are some specific examples:

•When more than one shared storage array exists, if the arrays are powered on in a different

order than they were when the cluster was initially configured, the order of the shared drives

will change for all cluster nodes.

•When a drive is added, internally, to a cluster node, the order of the shared drives will change

for that node.

•When an internal drive is removed from a cluster node, the order of the shared drives will

change for that node.

•When a drive is added to a shared storage array, if the drive is added anywhere other than the

last drive in the last array, the order of the drives will change for all cluster nodes.

•When an existing drive is removed from a shared storage array, if the drive is removed from

anywhere other than the last drive in the last array, the order of the drives will change for all

cluster nodes.

•When an array is added to the cluster’s shared storage, if the array is added anywhere other

than the last in the sequence of arrays, the order of the drives will change for all cluster

nodes.

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 4

ECG001/1298

•When an existing array is removed from the cluster’s shared storage, if the array was not the

last one brought online, the order of the drives will change for all cluster nodes.

Preventing the Issue

It is highly recommended that a power-on sequence for the shared storage arrays be determined

during the initial configuration of the cluster. Thereafter, this power-on sequence must be

followed exactly to ensure that each node sees the disk in a proper order in the Windows NT Disk

Administrator utility. When adding shared storage (a physical drive or an array), make it the last

drive (or array) to be brought online. In the case of adding an array, make sure it is the last array

to be powered-on; and add it to the power-on sequence as such.

On each node use disk administrator to verify that the disks are brought on-line in the expected

order before starting the Oracle instance. Also, verify that the PGMS service is set to start

manually.

Simplifying Detection of the Issue

A method that simplifies detection of the issue is to create logical partitions that are not all the

same size. With different-sized logical partitions, disk administrator can be used to see the size of

the partitions, which can be quickly and easily compared against the sizes written in the suggested

Oracle worksheet. If the drive order in the worksheet does not compare with the drive order

shown in disk administrator, the drives were brought online out of sequence.

For example, the shared disks associated with the database could have a small unused partition as

the first partition on the disk. Assuming there are three disks associated with the database, a

sample configuration might be:

•Harddisk1 Partition1 is sized to 11 MB

•Harddisk2 Partition1 is sized to 12 MB

•Harddisk3 Partition1 is sized to 13 MB

When the cluster is powered on, if disk administrator shows harddisk1, partition1 as 12MB or

13MB, the drives were brought on-line out of sequence. The cluster should be shut down and

restarted correctly.

What Oracle Component is Affected?

How does the drive ordering issue manifest itself in Oracle8 Server? The focal point of this issue

resides in the Oracle symbolic link table files; frequently identified as ORALINKx.TBL. These

files create symbolic links, which are used by Oracle8 Server to map specific Oracle database

files to specific hard drive partitions. A link is required for each database file. A two node cluster

requires nine database files and one cluster file, and therefore requires ten links. The first

symbolic link table file is used by a two-node cluster. Each additional node requires two more

database files, two more links, and one more symbolic link table file .

Oracle suggests using a worksheet to define the symbolic links. For more information about the

worksheet, refer to the Oracle Parallel Server Getting Started Release 8.0.5 for Windows NT

manual. An example of such a worksheet follows. The example assumes the cluster consists of

two nodes – Node1 has two internal disk drives and Node2 has one internal disk drive.

Additionally, it assumes the shared storage consists of two fibre channel arrays - the first array

has three RAID logical drives and the second array has two RAID logical drives. Therefore,

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 5

ECG001/1298

Node1 represents the drives in the first array as Harddisk2, Harddisk3, and Harddisk4, while

Node2 represents them as Harddisk1, Harddisk2, and Harddisk3.

Thus, the configuration of the cluster as seen by disk administrator is:

Node1 Disk 0 An internal disk

Disk 1 An internal disk

Disk 2 Shared storage disk

Disk 3 Shared storage disk

Disk 4 Shared storage disk

Disk 5 Shared storage disk

Disk 6 Shared storage disk

Node2 Disk 0 An internal disk

Disk 1 Shared storage disk

Disk 2 Shared storage disk

Disk 3 Shared storage disk

Disk 4 Shared storage disk

Disk 5 Shared storage disk

A symbolic link worksheet corresponding to the above configuration is in the following table.

Note that paritition1 on each disk is used for the small, identifiable partitions discussed in the

Simplifying Detection of the Issue section above; and therefore, partititon1 is not shown in the

symbolic links worksheet.

Table 1. Original Oracle Symbolic Links Worksheet

Symbolic Link Node1 Node2

OPS_log1t1 Harddisk2 Partition2 Harddisk1 Partition2

OPS_log2t1 Harddisk2 Partition3 Harddisk1 Partition3

OPS_sys01 Harddisk2 Partition4 Harddisk1 Partition4

OPS_usr01 Harddisk3 Partition2 Harddisk2 Partition2

OPS_rbs01 Harddisk3 Partition3 Harddisk2 Partition3

OPS_tmp01 Harddisk3 Partition4 Harddisk2 Partition4

OPS_log1t2 Harddisk4 Partition2 Harddisk3 Partition2

OPS_log2t2 Harddisk4 Partition3 Harddisk3 Partition3

OPS_cntr01 Harddisk5 Partition2 Harddisk4 Partition2

OPS_cmdisk Harddisk6 Partition2 Harddisk5 Partition2

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 6

ECG001/1298

What happens when the drive numbering order changes?

When the numbers associated with the shared drives change the symbolic link table files are no

longer correct. Each of these files must be modified to reflect the changes in disk structure.

Returning to the example worksheet given above, assume that two physical disks are added to the

first fibre channel array, and that the physical disks are configured as a single RAID logical drive

with at least 3 partitions. In disk administrator the ordering of the disks in the second array

changes. The symbolic link table file must be changed.

Note: If the cluster consists of more than two nodes, the other symbolic link table files need to

be modified as well.

Thus, the new configuration of the cluster as seen by disk administrator is:

Node1 Disk 0 An internal disk

Disk 1 An internal disk

Disk 2 Shared storage disk

Disk 3 Shared storage disk

Disk 4 Shared storage disk

Disk 5 Shared storage disk

Disk 6 Shared storage disk

Disk 7 Shared storage disk

Node2 Disk 0 An internal disk

Disk 1 Shared storage disk

Disk 2 Shared storage disk

Disk 3 Shared storage disk

Disk 4 Shared storage disk

Disk 5 Shared storage disk

Disk 6 Shared storage disk

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 7

ECG001/1298

A symbolic link worksheet corresponding to the above configuration is in the following table.

Note that paritition1 on each disk is used for the small, identifiable partitions discussed in the

Simplifying Detection of the Issue section above; and therefore, partititon1 is not shown in the

symbolic links worksheet.

Table 2. Modified Oracle Symbolic Links Worksheet

Symbolic Link Node1 Node2

OPS_log1t1 Harddisk2 Partition2 Harddisk1 Partition2

OPS_log2t1 Harddisk2 Partition3 Harddisk1 Partition3

OPS_sys01 Harddisk2 Partition4 Harddisk1 Partition4

OPS_usr01 Harddisk3 Partition2 Harddisk2 Partition2

OPS_rbs01 Harddisk3 Partition3 Harddisk2 Partition3

OPS_tmp01 Harddisk3 Partition4 Harddisk2 Partition4

OPS_log1t2 Harddisk4 Partition2 Harddisk3 Partition2

OPS_log2t2 Harddisk4 Partition3 Harddisk3 Partition3

OPS_log1t3 (new volume) Harddisk5 Partition2 Harddisk4 Partition2

OPS_log2t3 (new volume) Harddisk5 Partition3 Harddisk4 Partition3

OPS_cntr01 Harddisk6 Partition2 Harddisk5 Partition2

OPS_cmdisk Harddisk7 Partition2 Harddisk6 Partition2

Finally, after the symbolic link table file has been modified, it needs to be run through an Oracle

utility called SETLINKS. Refer to the Oracle Parallel Server Getting Started Release 8.0.5 for

Windows NT manual and to other appropriate Oracle8 documentation on the location and

parameters of the SETLINKS utility.

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 8

ECG001/1298

Removing a Shared Storage Array

Each cluster node, and the cluster as a whole, depends on the shared storage for the Oracle

database, Oracle data logs, and possibly application program files. If the shared storage array is

removed, all clustered applications that are dependent on that array will be unable to operate

properly.

IMPORTANT: Removing a shared storage array may remove information that is vital to the

database. The database administrator should determine if removal of the array requires that the

database be recreated.

Before removing a shared storage array, perform the following steps:

1. On each node, shutdown the database. This can be accomplished with Oracle Enterprise

Manager or some other management application. As well, it can be accomplished using an

Oracle database administration tool, SVRMGR. Using SRVMGR from the command line,

enter the following commands:

1. C:\ SVRMGR30

2. SVRMGR> connect internal/<password>

3. SVRMGR> shutdown

4. SVRMGR>exit

2. Next, stop the oracle service with the following command:

C:\Net stop oracleservice<ops_instance_sid>

3. Shutdown Windows NT Server and power off all the cluster nodes. Power off all of the fibre

channel arrays.

4. For the fibre channel array that is being removed, physically unplug the fibre channel cables

from the array and from the fibre channel hub.

5. When the cluster is ready to be restarted, ensure the fibre channel arrays are powered on first,

in the same order they were powered on when the cluster was originally configured.

IMPORTANT: If the removed array was not last in the power-on sequence of the arrays, you

will need to reconfigure the Oracle symbolic links. For information see the section in this paper

entitled Managing Changes to Drive Ordering.

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 9

ECG001/1298

Adding a Shared Storage Array

A fibre channel storage array cannot be dynamically added to the cluster. You must follow these

steps to add another shared storage array to an existing cluster.

1. On each node, shutdown the database. This can be accomplished with Oracle Enterprise

Manager or some other management application. As well, it can be accomplished using an

Oracle database administration tool, SVRMGR. Using SRVMGR from the command line,

enter the following commands:

1. C:\SVRMGR30

2. SVRMGR> connect internal/<password>

3. SVRMGR> shutdown

4. SVRMGR>exit

2. Next, stop the oracle service with the following command:

C:\Net stop oracleservice<ops_instance_sid>

3. Shutdown Windows NT Server and power off all the cluster nodes. Power off all of the fibre

channel arrays.

4. Insert the new SCSI drives into the fibre channel array.

5. Using the fibre channel cables, physically attach the fibre channel array to the fibre channel

hub used for shared storage system.

•See the Compaq Fibre Channel Storage System User Guide for details on how to install

cables and shortwave Gigabit Interface Converters.

6. Restart the fibre channel arrays. To avoid the drive ordering issue explained in the Managing

Changes to Drive Ordering section above, restart the original arrays first – in the same order

they were started when the cluster was originally configured. Then power on the newly added

array. If you change the power-on sequence of the fibre channel arrays be sure to modify the

symbolic link table file(s) to reflect the changes in drive order.

7. Boot the primary cluster node and start Windows NT.

8. Log on and run the Compaq Array Configuration Utility to create the desired RAID logical

drives and to configure them with the desired RAID level.

9. Run disk administrator to create an extended partition on each of the newly configured disks.

10. Using disk administrator create logical partitions within the newly created extended

partitions.

IMPORTANT: Do not format the drives. Oracle8 Parallel Server uses RAW partitions, which

requires that the drive not be formatted with any file system.

11. Use disk administrator to remove the drive letters that might be assigned to the newly created

logical partitions.

Modifying Physical Cluster Resources in a Compaq Parallel Database Cluster 10

ECG001/1298

12. The symbolic link table files may need to be modified. If so, run the symbolic link table files

through the SETLINKS utility on each cluster node. Refer to the section in this chapter

entitled Managing Changes to Drive Ordering for comprehensive information about this task.

The symbolic link table files will need to be modified to properly assign the symbolic links if

the disk number assignments (as seen by disk administrator) have changed.

Note: The number of symbolic link table files depends on the number of nodes in the cluster.

All symbolic link table files must be modified.

13. Power on each cluster node.

14. Use the disk administrator remove the driver letters to the newly added partitions and to

verify that the order of the disks is the order that is expected. If not, you will need to

troubleshoot the problem as to why the expected order does not exist. See the troubleshooting

section in the Compaq Parallel Database Cluster Administrator Guide for troubleshooting

suggestions.

15. Perform the Oracle commands to associate the new data files to the database.

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