Administrator Guide

5. Click OK.
Disable Data Reduction for a Volume
Disabling Data Reduction on a volume permanently uncompresses the reduced data starting the next data progression cycle.
Steps
1. If the Storage Manager Client is connected to a Data Collector, select a Storage Center from the Storage view.
2. Click the Storage tab.
3. In the Storage tab navigation pane, select the volume you want to modify.
4. In the right pane, click Edit Settings.
The Edit Volume dialog box opens.
5. In the Volumes view, select the volume you want to modify.
6. From the Data Reduction Profile drop-down menu, select None.
7. Click OK.
Managing Snapshot Profiles
A Snapshot Profile is a collection of rules describing when to take periodic snapshots for one or more volumes and the time at which
snapshots are deleted (expired).
A snapshot is a point-in-time copy (PITC) of one or more volumes. Storage Center snapshots differ from traditional snapshots/PITCs
because blocks of data or pages are frozen and not copied. No user data is moved, making the process efficient in both time taken to
complete the snapshot, and space used by snapshots.
NOTE:
If two or more snapshots are scheduled to be created at the same time for a given volume, the Storage Center
creates only one snapshot. The snapshot that has the longest expiration time is created, and the other scheduled
snapshots are ignored.
Related concepts
Managing Storage Profiles
Managing QoS Profiles
Default Snapshot Profiles
By default, Storage Center provides two standard snapshot profiles that cannot be deleted.
• Daily – Creates a snapshot every day at 12:01 AM, and expires the snapshot in one week.
• Sample – Applies three schedule rules:
• Creates a snapshot every 12 hours between 12:05 AM and 6 PM, expiring in five days.
• Creates a snapshot on the first day of every month at 11:30 PM, expiring in 26 weeks.
• Creates a snapshot every Saturday at 11:30 PM, expiring in 5 weeks.
Consistent and Non-Consistent Snapshot Profiles
When a snapshot is taken for a volume, I/O is halted to allow the operation to take place. A consistent snapshot profile halts I/O to all
associated volumes until a snapshot is taken for each volume, ensuring that the snapshots contain data for the same time period. A non-
consistent snapshot profile creates snapshots for associated volumes without guaranteeing that the snapshots will finish at the same time,
which is less resource intensive.
Consistent Snapshot Profile
Non-Consistent Snapshot Profile
Halts I/O across all volumes as a group Halts I/O for each volume independently of other volumes.
Resource intensive Less resource intensive — depends on the amount of data written
since the previous snapshot
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