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Chapter 3 Notes
77
(3) Separate, Replicate, and Restore are executed in units of disks but not units of partitions. Be
careful in setting and operating partitions. To prevent operation errors and trouble, the partition
settings on the MV and RV sides must be the same for all the servers.
(4) To ensure data consistency, keep the following in mind:
• Before executing Separate, unmount the MV.
• Before executing Replicate, unmount the RV.
• Before executing Restore, unmount the MV and RV.
• When executing Replicate and Separate, generally do not specify Read Only as RV access
restriction.
• The MV and RV file systems must be in the same format.
• Use the MV and RV on different servers.
(5) When separating volumes operating on Windows system, the data applications and operating
system are storing on buffer must be reflected on volumes, using combination of iSMrc_flush
command and iSMrc_umount command.
* If file control information is not reflected on volumes, an error message may appear upon
mounting RV, disabling use of RV.
* Oracle or Microsoft SQL Server 2000 has a system of maintaining data consistency (static point)
even under operating status, without stopping operations. (Refer to 3.7 (1) “Separate and data
consistency”.)
(6) When Unmount is executed for a drive on a Windows system, the drive may be automatically
mounted if a service or application which accesses a disk is operating.
Therefore when unmounting drive using iSMrc_umount command, all applications and services
accessing to the drive must be terminated in advance.
Target services and applications (example):
• Recycle bin
• ESMPRO (ESMCommonService, ESMFS Server, ESM Storage Service)
• IIS (IIS Admin Service, World Wide Web Publishing Service)
• FTP (FTP Publishing Service)
• Link Tracking Service
• Monitor (virus/drive) software
• Backup software
* Applications accessing to the drive is identified using the following utility (visit the web site for
detailed use of the software.)
Utility: Process Explorer (GUI type), Handle (command line type)
Web site: http://www.sysinternals.com/
* If access to drive is not complete, unmounting (iSMrc_umount) may terminate abnormally. It
is useful to create a batch file that activates “Handle” upon abnormal termination of unmounting
(iSMrc_umount).
For discarding cache data in RV file system, forcible unmounting is allowed with -force option.
However, note that it causes errors in applications and services accessing to the drive.