Monitoring file systems backup Post: 302901048

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Special Forums UNIX and Linux Applications Infrastructure Monitoring Monitoring file systems backup Post 302901048 by hicksd8 on Sunday 11th of May 2014 07:45:52 AM

05-11-2014

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You don't state what hardware platform you have, what the cluster software suite is, or what the backup software is.

Your post indicates that you have a good understanding of how a (generically speaking) cluster works and that any one filesystem can only be under the control of one node at a time. Having multiple nodes thinking they could write to the volume would be anarchy and a clear recipe for data corruption. It is definitely the job of the cluster software suite to ensure that that never happens. Having said that, different cluster suites can have starkly different functionality.

Similarly, backup software suites also vary in the manner of operation.

So discussing cluster backup in generic terms I would say that there are two options for implementing backups. Firstly, when node-A fails and node-B takes over (by checking orphaned filesystems and then mounting them, taking over and broadcasting the cluster name and ip address (node-C and ipaddr-C) some cluster software will also failover scheduled jobs (eg, backup). Of course, the backup device(s) need to be still available (or node-B needs to have its own tape drive, for example) for this to work. Alternatively, like all the user community who only know about node-C and ipaddr-C, the backup is run from a machine outside the cluster which "calls in" on node-C, accesses or NFS mounts the filesystem, and backs it up. Usually, this is the preferred method.

Now in this scenario the backup software has no knowledge that it is backing up a cluster volume and it should work exactly the same way as it would with a local volume, ie, if it loses communication with the volume, it will report a backup failure. Some backup software suites (eg, NetBackup) are of client/server architecture which are very intelligent and will report failures in exactly the same way they usually do.

So in summary, the fact that it is a cluster should be largely irrelevant to reporting errors in backup schedules. How the success of a backup is verified is the same as the non-cluster scenario.

Hope that helps. Feel free to continue your questions but please give us all a clue of the platform and software(s) involved.

Last edited by hicksd8; 05-11-2014 at 12:46 PM..

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ndb_print_backup_file

NDB_PRINT_BACKUP_(1)					       MySQL Database System					      NDB_PRINT_BACKUP_(1)

NAME

       ndb_print_backup_file - print NDB backup file contents

SYNOPSIS

       ndb_print_backup_file file_name

DESCRIPTION

       ndb_print_backup_file obtains diagnostic information from a cluster backup file.
	       Usage

	   ndb_print_backup_file file_name

       file_name is the name of a cluster backup file. This can be any of the files (.Data, .ctl, or .log file) found in a cluster backup
       directory. These files are found in the data node's backup directory under the subdirectory BACKUP-#, where # is the sequence number for
       the backup. For more information about cluster backup files and their contents, see Section 17.5.3.1, "MySQL Cluster Backup Concepts".

       Like ndb_print_schema_file and ndb_print_sys_file (and unlike most of the other NDB utilities that are intended to be run on a management
       server host or to connect to a management server) ndb_print_backup_file must be run on a cluster data node, since it accesses the data node
       file system directly. Because it does not make use of the management server, this utility can be used when the management server is not
       running, and even when the cluster has been completely shut down.
	       Additional Options

       None.

COPYRIGHT

       Copyright (C) 1997, 2014, Oracle and/or its affiliates. All rights reserved.

       This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as
       published by the Free Software Foundation; version 2 of the License.

       This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

SEE ALSO

       For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online
       at http://dev.mysql.com/doc/.

AUTHOR

       Oracle Corporation (http://dev.mysql.com/).

MySQL 5.5							    01/30/2014						      NDB_PRINT_BACKUP_(1)