Planning and Configuring HP-UX DCE 1.9

Chapter 8

Notes on Cell Administration

Administering CDS

This section contains information on administering CDS that supplements the information in the

OSF DCE

Administration Guide -Core Services

and

OSF DCE Administration Reference

Deleting a Clearinghouse

Before removing a CDS server clearinghouse, you must move or delete any directories having master replicas

in the clearinghouse. If you do not do this, the clearinghouse removal operation fails, thereby preventing

unintended loss of data.

Appropriate administration commands for clearinghouses and directories can be used to identify, move, or

delete master replicas as required, in order to remove a clearinghouse.

Skulking Directories

CDS propagates updated name space information among all directory replicas with periodic automatic skulks

so that consistent information is available throughout the name space. To conserve network bandwidth, these

automatic skulks take place only every few hours.

Manual changes to the name space, such as the creation or deletion of any name space object or directory,

should always be followed by manual skulks to immediately propagate these changes and additions. This will

avoid errors (such as entry not found) which can arise when clients access directory replicas which have not

yet received updates for recently changed objects.

Note that skulks can take a few minutes to reach all parts of a cell, so do not expect instant availability of

updated information.

Known CDS Problems

Resource Problems

It is important to conﬁgure sufﬁcient resources for DCE according to the instructions in this manual. CDS

can fail if a CDS server or client system runs out of system resources such as swap space, disk space, or kernel

resources. Symptoms usually include a cdsadv or cdsd crash with one of a variety of error messages (which

may not directly indicate the source of the problem.)

If a CDS problem is linked to a shortage of resources, stop DCE, free or conﬁgure more resources, and then

restart DCE to bring the node back on-line in the cell.

Clock Reversal Problems

CAUTION Timestamps are used in the CDS database to establish the order of events in changes to the

name space. If the date/time on a DCE node is manually set backward more than a few

minutes, the CDS database can become corrupted, crashing cdsd, and leaving the cell

unusable. This is unrecoverable unless you have a recent backup. It is therefore imperative

that manual clock resetting be avoided on DCE nodes.