This section provides general notes on backup and replication.
The locale (software localisation information) of the internal code system (the code system specified when AdvancedCopy Manager is installed on the Storage Management Server) used by AdvancedCopy Manager must be installed on all Storage Servers.
Action is required if there are differences between the language environments (LANG) of the Storage Management Server and the Storage Servers. The following table shows the actions required for various combinations:
Storage Management Server | Storage Server | Action required |
|---|---|---|
Windows (SJIS) | Windows (SJIS) | None |
Solaris (EUC) | Install the SJIS package on the Storage Server. | |
HP-UX (EUC) | Install the SJIS package on the Storage Server. | |
Linux (EUC) | None | |
Linux (UTF8) | None | |
AIX (SJIS) | None | |
AIX (EUC) | Add the SJIS language environment on the Storage Server. | |
In accordance with the Solaris locale setting (standard: EUC) | Windows (SJIS) | None. (If the Storage Management Server is EUC, Storage Server processing is problem free.) |
Solaris (EUC) | None (if the code is the same). If the Management Server is SJIS, install the SJIS package on the Storage Server. | |
HP-UX (EUC) | None (if LANG is the same). If the Management Server is SJIS, install the SJIS package on the Storage Server. | |
Linux (EUC) | None | |
Linux (UTF8) | None | |
AIX (SJIS) | None (if LANG is the same). If the Management Server is EUC, add the EUC language environment. | |
AIX (EUC) | None (if LANG is the same). If the Management Server is SJIS, add the SJIS language environment. | |
Linux (EUC) | Windows (SJIS) | None. (If the Storage Management Server is EUC, Storage Server processing is problem free.) |
Solaris (EUC) | None | |
HP-UX (EUC) | None | |
Linux (EUC) | None | |
Linux (UTF8) | None | |
AIX (SJIS) | Add the EUC language environment on the Storage Server. | |
AIX (EUC) | None | |
Linux (UTF8) | Windows (SJIS) | None |
Solaris (EUC) | Add the UTF8 language environment on the Storage Server. | |
HP-UX (EUC) | Add the UTF8 language environment on the Storage Server. | |
Linux (EUC) | None | |
Linux (UTF8) | None | |
AIX (SJIS) | Add the UTF8 language environment on the Storage Server. | |
AIX (EUC) | Add the UTF8 language environment on the Storage Server. |
In addition, if inter-server replication is executed, the code system at the replication source server must be installed on the replication destination server at the same locale.
The following devices must not be backed up or replicated:
The device on which the system is stored
The device on which AdvancedCopy Manager has been installed
The device on which the management list of AdvancedCopy Manager resides
Data in transaction volume | Maintenance of data integrity | Operation |
|---|---|---|
File system | An AdvancedCopy Manager command unmounts the file system to maintain the integrity. | Refer to "Appendix A Pre-processing and Post-processing of Backup and Restoration", and "Appendix C Pre-processing and Post-processing of Replication". |
Other than the above | The data integrity must be maintained in operations. | Take appropriate action, such as stopping transactions during execution of backup or replication. |
Before starting either the backup or replication operation, 4.4.5 Fetching device information on a Storage Server that is managed by all the Storage Servers using the GUI client of AdvancedCopy Manager. The time taken to complete this operation is proportional to the total number of devices defined on the selected storage servers. If many devices are involved, perform this operation while the CPU or I/O load on the system is low.
As a guide, about 0.5 seconds are required per device (i.e., disk) when there is no load on the system.
When the device has a multipath configuration, a path switch is not carried out automatically, even if one of the two paths is blocked.
When one of the two paths is blocked, please perform the backup or replication again after taking the following steps:
Execute the following command on an available device to switch the path:
/usr/sbin/lspv hdisk* |
Execute the backup or replication command again.
Before backup/restoration or replication of a volume that can be mounted from multiple servers, cancel all mounting from the other servers.
For disks that need not be mounted from other servers, prevent multiple servers from detecting or accessing the same logical disk by setting up hardware, such as devices in the ETERNUS disk storage systems and Fibre Channel switches, accordingly.
For a copy operation targeted at a file system, unmount the relevant volume to prevent data access and maintain the data integrity.
If backup/restoration and replication are performed without unmounting the volume, an error occurs since a volume in use cannot be unmounted.
Note the following about processing where unmounting is enabled:
Another application is not using the volume. If another application is using it, suspend the application temporarily.
Users are not using the volume. If users are using it, prohibit them from using it temporarily.
Another volume is not mounted on the volume. If it is mounted, unmount it temporarily.
The volume is not shared with NFS sharing. If it is shared, unshare it temporarily.
Unmounting is required only during command execution. Normal operations can be resumed after command execution.
Copies can be made between different operating systems by using replication operations.
Use the following combinations to execute copy between different operating systems:
Copy destination | |||
|---|---|---|---|
slices | Logical Unit (disk) | ||
Copy source | slices | Y | N |
Logical Unit (disk) | Y | N | |
Y: Possible
N: Not possible
When replication occurs between servers, the -m option can be specified in the following commands in order to avoid communication processing to non-operating servers:
When the -m option is specified, any one of the following conditions must apply in order to ensure that problems do not arise as a result of not performing volume pre-processing and post-processing at the non-operating server:
The non-operating server has been shut down.
Manual pre-processing and post-processing is performed for the volumes on the non-operating server.
The target volume is a RAW device (Oracle, etc., that does not need pre-processing and post-processing), rather than a file system.
The Advanced Copy processing is performed by the ETERNUS disk storage systems. Therefore, direct enquiries concerning copy processing performance to the support department for the ETERNUS disk storage systems.
When restart the server after executing backup or replication, the backup volume will be disabled because its status will change from "active" to "defined". Furthermore, the backup volume may be newly detected by another device name. In this case, the backup management/replication management command will become one of the following errors.
swst3603
swst3605
swst3606
swsrp3603
swsrp3605
swsrp3606
When this occurs, the newly detected device must be deleted and the backup volume that can no longer be detected must be recovered.
Please follow the steps below:
(The examples below explain the cases where the transaction volume is described as vg02 created in hdisk2, the backup volume is described as vg04 created in hdisk4, and the newly detected device name is described as hdisk17.)
Unmount all volumes in the transaction disk
# umount /mnt/vg02 |
Deactivate the volume group of the transaction disk
# varyoffvg vg02 |
Check the disk status
# lspv hdisk0 005f74da1705160e rootvg active hdisk1 005f74da6688a970 None hdisk2 005f74da8a1b6e2f vg02 active hdisk3 005f74da70e35fc7 vg03 active hdisk5 005f74da8af5069d None hdisk16 005f74da6fd209eb vg16 active hdisk17 005f74da8a1b6e2f vg02 active <- The backup volume detected with a new name. |
Delete the disk definition newly detected
# rmdev -l hdisk17 -d hdisk17 is deleted |
Activate the volume group of the transaction disk
# varyonvg vg02 |
Mount all the volumes in the transaction disk
# mount /mnt/vg02 /dev/lv00 log is recreated |
Status of the transaction disk is activated.
# mkdev -l hdisk4 hdisk4 can be used |
Check if the backup volume can be activated for use
# lspv hdisk0 005f74da1705160e rootvg active hdisk1 005f74da6688a970 None hdisk2 005f74da8a1b6e2f vg02 active hdisk3 005f74da70e35fc7 vg03 active hdisk4 005f74da8a2d04e0 vg04 hdisk5 005f74da8af5069d None hdisk16 005f74da6fd209eb vg16 active |
