HP Serviceguard Creating Checkpoint and Snapshot Packages for CFS, Cfsmount /tmp/checklogfiles

SG-CFS-MP-1

7.After creating the mount point packages for the cluster file system, configure your application package to depend on the mount points. In the configuration file, configure a dependency, setting dependency_condition to SG-CFS-MP-pkg-#=UP and dependency_location to SAME_NODE. For more information about these parameters, see “Package Parameter Explanations” (page 233).

Creating Checkpoint and Snapshot Packages for CFS

The storage checkpoints and snapshots are two additional mount point package types. They can be associated with the cluster via the cfsmntadm(1m) command.

Mount Point Packages for Storage Checkpoints using Legacy Style Packages

The Veritas File System provides a unique storage checkpoint facility which quickly creates a persistent image of a file system at an exact point in time. Storage checkpoints significantly reduce I/O overhead by identifying and maintaining only the file system blocks that have changed since the last storage checkpoint or backup. This is done by a copy-on-write technique. Unlike a disk-based mirroring technology, which requires a separate storage space, this Veritas technology minimizes the use of disk space by creating a storage checkpoint within the same free space available to the file system.

For more information about the technique, see the Veritas File System Administrator’s Guide appropriate to your version of CFS, posted at http://www.hp.com/go/hpux-core-docs->HP-UX 11i Volume Management (LVM/VxVM) Software.

The following example illustrates how to create a storage checkpoint of the /cfs/mnt2 file system.

Start with a cluster-mounted file system.

1.Create a checkpoint of /tmp/logdata/log_files named check2. It is recommended that the file system already be part of a mount point package that is mounted.

cfsmntadm display

Cluster Configuration for	Node: ftsys9
MOUNT POINT	TYPE	SHARED VOLUME	DISK GROUP	STATUS
/tmp/logdata/log_files	regular	log_files	logdata	MOUNTED
Cluster Configuration for	Node: ftsys10
MOUNT POINT	TYPE	SHARED VOLUME	DISK GROUP	STATUS
/tmp/logdata/log_files	regular log_files		logdata	MOUNTED

fsckptadm -n create check2 /tmp/logdata/log_files

2.Associate it with the cluster and mount it.

cfsmntadm add ckpt check2 /tmp/logdata/log_files \ /tmp/check_logfiles all=rw

Package name "SG-CFS-CK-2" was generated to control the resource Mount point "/tmp/check_logfiles" was associated to the cluster

cfsmount /tmp/check_logfiles

3.Verify: cmviewcl

CLUSTER STATUS cfs-cluster up

NODE	STATUS	STATE
ftsys9	up	running
ftsys10	up	running
MULTI_NODE_PACKAGES
PACKAGE	STATUS	STATE	AUTO_RUN	SYSTEM

Configuring the Cluster 217