4.1.0 HP PolyServe Matrix Server administration guide (T5392-96073, October 2010)

Share as Shadow Copy of Shared Folder. Check this box if you want users to be able
to use the snapshot as a shadow copy.
Engenio snapshots
The dialog asks for the following information:
Label. The label is used to identify the snapshot on the Management Console.
Share as Shadow Copy of Shared Folder. Check this box if you want users to be able
to use the snapshot as a shadow copy.
Engenio Options. The first time a snapshot is taken of a particular filesystem, the
snapshot process creates a repository on disk that stores pointers to the data in the
source filesystem. As changes are made to the filesystem, subsequent snapshots will
copy the changed data to the repository.
When you take the first snapshot of a filesystem, you will be asked to specify the
size for the repository. The size needed varies depending on the amount of data that
will change in the filesystem and how long the snapshot will be active. The repository
size is specified as a percentage of the volume holding the filesystem. The default is
20% of the base volume.
Snapshot processing
When you complete the information on the dialog, Matrix Server takes these steps:
• Quiesces the filesystem to ensure that the snapshot can be mounted cleanly.
• Performs the snapshot operation in accordance with the snapshot method. Matrix
Server uses the next available LUNs for the snapshot.
• Resumes normal filesystem activity.
• Imports the LUNs used for the snapshot into the cluster. The import can take sev-
eral moments.
When the snapshot is complete, you will be asked whether you want to assign a
drive letter or path to the snapshot. If you choose to do this, the “Assign a Matrix-Wide
Drive Letter or Path” window will be displayed. (See “Drive letters and mount
paths” on page 118 for more information.)
Snapshots appear on the Management Console beneath the entry for the filesystem,
while snapclones appear as a separate filesystem. Each snapshot or snapclone is
assigned a Matrix Server psd or psv device name.
In the following example, the two filesystem entries are snapclones. The next entry
is a regular filesystem, and is followed by snapshots of the filesystem.
Manage hardware snapshots144