HP StorageWorks SAN Virtualization Services Platform Manager user guide (AG781-96017, March 2009)

DescriptionProperty
The mode of maintaining reallocation table virtual disks for the group’s tasks.
Possible values:
• Dirty Regions—The mirror service is keeping track of the virtual disk regions
which the host updated recently, so that, in case of an unexpected host failure,
task synchronization can be restored quickly by handling only the specific re-
gions which might not have been updated on all tasks.
• No dirty—The mirror service considers the entire virtual disk as one region.
When the mirror service recovers from an asynchronous event of host failure
and discovers that there is a risk for dirty regions (because the host was using
the group shortly before failure) it starts a process of synchronizing the entire
virtual disk with all the tasks that were normal at the time of failure. If there
was only one task with normal status at the time of failure there is no synchron-
ization. Tasks that had already failed when the host failed are not synchronized.
Dirty Mode
The percentage progress of synchronizing a task when the task is newly created
or when a user performed a Resync on a task after failure.
Progress
A free text display field. To modify the text that appears here, right-click the sync
mirror group and select Manage > Edit Comment. You can enter any text you want.
Comment
The time at which the group was created.Creation Time
The user who created the group.Created By
The time at which the group was last modified.Modification Time
The user who last modified the group.Modified By
This field is not relevant to the HP StorageWorks VSM.Internal Reserved by Host
Yes indicates that the sync mirror group is configured as a cluster resource.Clustered
Viewing synchronous mirror group information
You can display detailed information related to the sync mirror group in the tabs area below the sync
mirror groups list.
To view information related to a sync mirror group:
In the sync mirror groups list, select the sync mirror group. The following tabs are displayed:
• Properties—Provides general information about the group, as described in Table 114 on page 285.
• Sync Mirror Task—Displays all sync mirror tasks running on the group.
• PiT—Shows the snapshot PiTs created on the sync mirror group.
• Host Presentation—Displays information about the hosts that have permission to access the sync
mirror group.
• Data Path Module/VSM—When a virtual disk is bootable or used by agents that write data to
the SAN through DPMs, the Data Path Module/VSM tab provides information about the DPMs
and VSM servers that service the virtual disk, and identifies the primary and active servers.
• Security—Shows which permissions are assigned to users and user groups for managing the
group.
• Disabled Operations—Shows which operations you cannot currently perform on the group, and
the reason for each.
These tabs are described in the following sections.
Using mirroring286