Administrator Guide

Disable Data Reduction for a Volume
Disabling Data Reduction on a volume permanently uncompresses the reduced data starting the next Data Progression cycle.
1. Select a Storage Center from the Storage view. (Data Collector connected Storage Manager Client only)
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. From the Data Reduction Prole drop-down menu, select None.
6. Click OK.
Managing Snapshot Proles
A Snapshot Prole 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 dier from traditional snapshots/
PITCs because blocks of data or pages are frozen and not copied. No user data is moved, making the process ecient 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.
Default Snapshot Proles
By default, Storage Center provides two standard Snapshot Proles 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 ve days.
– Creates a snapshot on the rst 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.
Non-Consistent and Consistent Snapshot Proles
When a snapshot is taken for a volume, IO is halted to allow the operation to take place. A consistent Snapshot Prole halts IO 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 Prole creates snapshots for associated volumes without guaranteeing that the snapshots will nish at the
same time, which is less resource intensive.
Consistent
Snapshot Prole Non-Consistent Snapshot Prole
Halts IO across all volumes as a group Halts IO for each volume independently of other volumes.
Resource intensive Less resource intensive — depends on the amount of data
written since the previous snapshot
Number of volumes limited based on storage controller.
• SC8000, SC9000, SC7020, and SC7020F: 100
• SC5020 and SC5020F: 50
• SC4020: 40
• SCv2000 and SCv3000: 25
No limit to the number of volumes to which the Snapshot Prole
is attached
Snapshots are taken of all volumes simultaneously Choose between Standard (one volume at a time) or Parallel (all
volumes simultaneously)
Storage Center Administration
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