InfoScale™ 9.0 Storage Foundation 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 Enterprise Vault
- Using the VSS snapshot wizards with Microsoft SQL
- Copy on Write (COW)
- 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
- Volume encryption
- Secure file system (SecureFS) for protection against ransomware
- 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
- vxschadm
- sfcache
- Tuning SFW
- Appendix B. VDID details for arrays
- Appendix C. Executive Order logging
Prepare
Prepare creates a snapshot mirror or plex, which is attached to and synchronized with a volume. Alternatively, if you apply the command to a volume that already has one or more normal mirrors, you can designate an existing mirror to be used for the snapshot mirror. The advantage of selecting an existing mirror is that it saves time, since it is not necessary to resynchronize the mirror to the volume.
Note:
The Prepare command replaces the Snap Start command in the VEA GUI.
The mirror synchronization process can take a while, but it does not interfere with use of the volume. If the prepare the volume for snapshot process fails, the snapshot mirror is deleted if it was created from scratch, and its space is released. If you selected a normal mirror to be used for the snapshot mirror, that mirror reverts to its normal state if the prepare the volume for snapshot process fails.
When the prepare the volume for snapshot process is complete, the status of the snapshot mirror displays as Snap Ready on the Mirrors tab in the right pane of the VEA GUI. The snapshot mirror can be associated with a snapshot volume by using the Snap Shot command. Once the snapshot mirror is created, it continues to be updated until it is detached.
Note:
Dynamic disks belonging to a Microsoft Disk Management Disk Group do not support the Prepare or Snap Start commands.
To create a snapshot mirror
- Right-click on the volume that you want to take a snapshot of.
A context menu is displayed.
- Select Snap > Prepare.
The Prepare volume for FlashSnap wizard welcome screen appears.
Click Next to continue.
- The screen that appears depends on whether you already have a mirrored volume or not. If you already have a mirrored volume, the snapshot mirror continues to be updated until it is detached by using the Snap Shot command.
The various screens are as follows:
Mirrored volume: If you have a mirrored volume, a screen appears to let you select an existing mirror to be used for the snapshot mirror.
If you have a mirrored volume and there is also a disk available on your system to create an additional mirror, the screen lets you choose either to use an existing mirror for the snapshot or to have a new mirror created.
If you have a mirrored volume and there is no disk available for creating a new snapshot mirror, the screen lets you select from existing mirrors in the volume.
If you select an existing mirror, click Next to continue to the summary screen and click Finish to complete the Prepare command.
If you do not select an existing mirror, click Next to continue and follow the instructions for an unmirrored volume.
Unmirrored volume: If you have an unmirrored volume or you have not selected an existing mirror to use for the snapshot mirror, select the disk to be used for the snapshot mirror from the window for disk selection.
The default setting is to have the program automatically select the disks where the mirror is created.
Alternatively, you can specify the disks that can be used to create the snapshot mirror by clicking the Manually select disks radio button. If you select the manual setting, use the Add or Add All option to move the selected disks to the right pane of the window. The Remove and Remove All options let you move selected disks back to the left pane.
You may also check Disable Track Alignment to disable track alignment on the snapshot mirror volume.
Click Next to continue to specify attributes.
Specify attributes
On this screen select one of the following volume layout types:
Concatenated
Striped
If you create a striped volume, the Columns and Stripe unit size boxes need to have entries. Defaults are provided.
For a concatenated or striped volume, you may also specify to mirror across disks by the following:
Port
Target
Enclosure
Channel
The operation to prepare a volume for a snapshot fails if the appropriate resources are not available to support the selected attributes to mirror across disks.
After the Prepare command completes, a new snapshot mirror is attached to the volume. See the sample screen below. In that screen, the volume Flash has a snapshot mirror attached to it.
The new mirror is added to the Mirrors tab for the volume. In the sample screen, the mirror is identified as a snapshot mirror and has the Snapshot icon. After the snapshot mirror is synchronized with the volume, its status becomes Snap Ready.
It is important to make sure that the snapshot mirror (or snap plex) has completed its resynchronization and displays the status of Snap Ready before continuing with the Snap Shot command or doing any other operations on the snapshot mirror. Also, if you shut down the server or deport the disk group containing the volume being prepared for a snapshot before resynchronization completes, the snapshot mirror is deleted when the disk group with the original volume comes online again.
The DCO (Disk Change Object) volume is created to track the regions on a volume that are changed while a mirror is detached.
The DCO volume is not included in the tree view of the VEA GUI. To view the DCO volume, you must use the Disk View. To access the Disk View, click the Disk View tab in the right pane or select Disk View from a disk's or volume's context menu.
The sample Disk View screen that follows shows the DCO log that the Prepare command creates.
Note:
The Break Mirror and Remove Mirror commands do not work with the snapshot mirror.
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