Storage Foundation 7.4.1 Administrator's Guide - Windows
- Overview
- Setup and configuration
- Function overview
- About the client console for Storage Foundation
- Recommendations for caching-enabled disks
- Configure basic disks (Optional)
- About creating dynamic disk groups
- About creating dynamic volumes
- Set desired preferences
- Using the GUI to manage your storage
- Working with disks, partitions, and volumes
- Adding storage
- Disk tasks
- Remove a disk from the computer
- Veritas Disk ID (VDID)
- General Partition/Volume tasks
- Mount a volume at an empty folder (Drive path)
- Expand a dynamic volume
- Shrink a dynamic volume
- Basic disk and volume tasks
- Automatic discovery of SSD devices and manual classification as SSD
- Volume Manager space allocation is SSD aware
- Dealing with disk groups
- Disk groups overview
- Delete a dynamic disk group
- Detaching and attaching dynamic disks
- Importing and deporting dynamic disk groups
- Partitioned shared storage with private dynamic disk group protection
- Fast failover in clustered environments
- iSCSI SAN support
- Settings for monitoring objects
- Event monitoring and notification
- Event notification
- Configuring Automatic volume growth
- Standard features for adding fault tolerance
- Performance tuning
- FlashSnap
- FlashSnap components
- FastResync
- Snapshot commands
- Dynamic Disk Group Split and Join
- Dynamic disk group join
- Using Dynamic Disk Group Split and Join with a cluster on shared storage
- Dynamic Disk Group Split and Join troubleshooting tips
- Fast File Resync
- Volume Shadow Copy Service (VSS)
- Using the VSS snapshot wizards with Microsoft Exchange
- Using the VSS snapshot wizards with Enterprise Vault
- Using the VSS snapshot wizards with Microsoft SQL
- Copy on Write (COW)
- Using the VSS COW snapshot wizards with Microsoft Exchange
- Using the VSS COW snapshot wizards with Microsoft SQL
- Configuring data caching with SmartIO
- Typical deployment scenarios
- About cache area
- Configuring SmartIO
- Frequently asked questions about SmartIO
- Dynamic Multi-Pathing
- Configuring Cluster Volume Manager (CVM)
- Configuring a CVM cluster
- Administering CVM
- Access modes for cluster-shared volumes
- Storage disconnectivity and CVM disk detach policy
- Unconfiguring a CVM cluster
- Command shipping
- About I/O Fencing
- Administering site-aware allocation for campus clusters
- SFW for Hyper-V virtual machines
- Introduction to Storage Foundation solutions for Hyper-V environments
- Live migration support for SFW dynamic disk group
- Preparing the host machines
- Configuring the SFW storage
- Administering storage migration for SFW and Hyper-V virtual machine volumes
- Optional Storage Foundation features for Hyper-V environments
- Microsoft Failover Clustering support
- Configuring a quorum in a Microsoft Failover Cluster
- Implementing disaster recovery with Volume Replicator
- Troubleshooting and recovery
- Using disk and volume status information
- Resolving common problem situations
- Commands or procedures used in troubleshooting and recovery
- Rescan command
- Repair volume command for dynamic mirrored volumes
- Additional troubleshooting issues
- Disk issues
- Volume issues
- Disk group issues
- Connection issues
- Issues related to boot or restart
- Cluster issues
- Dynamic Multi-Pathing issues
- vxsnap issues
- Other issues
- CVM issues
- Appendix A. Command line interface
- Overview of the command line interface
- vxclustadm
- vxvol
- vxdg
- vxclus
- vxdisk
- vxassist
- vxassist (Windows-specific)
- vxsd
- vxedit
- vxdmpadm
- vxcbr
- vxsnap
- vxscrub
- sfcache
- Tuning SFW
- Appendix B. VDID details for arrays
vxsnap
The vxsnap CLI utility lets you perform multiple snapshots at the same time. To use vxsnap, you must have InfoScale Enterprise installed.
Note:
FlashSnap is available only with the Enterprise edition. See the "Licensing" section in the Veritas InfoScale Installation and Upgrade Guide for details.
Note:
Dynamic disks belonging to a Microsoft Disk Management Disk Group do not support the vxsnap command.
The vxsnap CLI utility makes use of both FlashSnap and Volume Shadow Copy Service (VSS) technology to create high-quality snapshots that can be done when application files are open. VSS can quiesce the application for the moment when the snapshot is created and then resume the application immediately after the snapshot; but a VSS-aware application must be used, such as Microsoft SQL Server. The vxsnap CLI utility acts as a VSS requestor, which lets you use SFW to initiate VSS snapshots at any time.
The vxsnap utility is designed to create and restore multiple snapshot sets.
The vxsnap CLI utility lets you name the snapshot volume. You must create the mirror for the volume before using the vxsnap CLI utility. The vxsnap prepare command can be used to create the mirror for the volume.
The vxsnap CLI utility allows a traditional full snapshot or a Microsoft Copy on Write (COW) snapshot. Microsoft COW snapshots have the benefit of being faster than full snapshots and take up less storage space.
A COW snapshot creates a shadow copy that is differential. When a change to the original volume occurs, the block that is about to be modified is read and then written to a "differences area", which preserves a copy of the data block before it is overwritten with the change. Thus making a copy of the block before it is changed. Using the blocks in the differences area and unchanged blocks in the original volume, a copy of the volume can be constructed that represents the volume in the state before any changes occurred.
The benefit of the COW snapshot is that it creates shadow copies very rapidly because it only writes the changed blocks at a given time. Using the blocks in the differences area and unchanged blocks in the original volume, the initial state of the original volume can be reconstructed.
Note:
Either the prepare or start keyword may be used in the CLI, however prepare is recommended.
Note:
For vxsnap examples , see the application-specific Solutions guide. For example, for Microsoft SQL Server, refer to the Storage Foundation and High Availability Solutions Quick Recovery and Microsoft Clustering Solutions Guide for Microsoft SQL.
Note:
To use vxsnap, the disk group must be a Storage Foundation for Windows 4.0 or later version. You must upgrade the disk groups that are created with an earlier version of Volume Manager for Windows before using the vxsnap utility.
Note:
The vxsnap commands must be invoked on a local system.
prepare | Creates snapshot mirrors of the volumes in the specified component. The snapshot mirrors remain attached to and synchronized with the original volumes Note: Either the prepare or start keyword may be used in the CLI, however prepare is recommended. |
create | Creates simultaneous snapshots of all volumes in the specified component, providing a point-in-time snapshot set. |
reattach | Reattaches and desynchronizes an existing snapshot set to the original database volumes. |
restore | Restores a volume, database, or component from a snapshot set. |
refresh | Refreshes all VSS Writers and component objects. |
diffarea | Manages shadow storage area for COW snapshots. For example, the management of shadow storage area creation, size, and removal. |
delete | Deletes COW snapshots corresponding to the information in the specified snapshot set. |
Type the following sequence to view a description of the command syntax:
vxsnap <Keyword> -?
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