Administrator Guide

Storage Manager assigns a 4 GB multiple and assigns the remainder as unused. If space exists that is not a 4
GB multiple, you can use it to increase the size of the thin virtual disk. To increase the size of the thin virtual disk,
select Storage → Virtual Disk → Increase Capacity.
• Repository Expansion Policy — Select either Automatic or Manual to indicate whether MD Storage Manager
must automatically expand physical capacity thresholds. If you select Automatic, enter a Maximum Expansion
Capacity value that triggers automatic capacity expansion. The MD Storage Manager expands the preferred
capacity in increments of 4 GB until it reaches the specified capacity. If you select Manual, automatic expansion
does not occur and an alert is displayed when the Warning Threshold value percentage is reached.
• Warning Threshold — When consumed capacity reaches the specified percentage, MD Storage Manager
sends an E-mail or SNMP alert.
Thin Virtual Disk States
The following are the virtual disk states displayed in MD Storage Manager:
• Optimal — Virtual disk is operating normally.
• Full — Physical capacity of a thin virtual disk is full and no more host write requests can be processed.
• Over Threshold — Physical capacity of a thin virtual disk is at or beyond the specified Warning Threshold
percentage. The storage array status is shown as Needs Attention.
• Failed — Virtual disk failed, and is no longer available for read or write operations. The storage array status is
shown as Needs Attention.
Comparison—Types Of Virtual Disks And Copy Services
The availability of copy services depends on the type of virtual disk that you are working with.
The following table shows the copy services features supported on each type of virtual disk.
Copy Services Feature Standard Virtual Disk in a Disk
Group
Standard Virtual Disk in a
Disk Pool
Thin Virtual Disk
Snapshot (Legacy) Supported Not supported Not supported
Snapshot image Supported Supported Supported
Snapshot virtual disk Supported Supported Supported
Rollback of snapshot Supported Supported Supported
Delete virtual disk with
snapshot images or
snapshot virtual disks
Supported Supported Supported
Consistency group
membership
Supported Supported Supported
Remote Replication
(Legacy)
Supported Not supported Not supported
Remote Replication Supported Supported Not supported
The source of a virtual disk copy can be either a standard virtual disk in a disk group, a standard virtual disk in a disk
pool, or a thin virtual disk. The target of a virtual disk copy can be only a standard virtual disk in a disk group or a
standard virtual disk in a disk pool, not a thin virtual disk. The following table summarizes the types of virtual disks you
can use in a virtual disk copy.
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