Administrator Guide

Emergency Mode

Storage Center enters Emergency Mode when the system can no longer operate because it does not have enough free space.

In Emergency Mode, Dell Storage Manager Client responds with the following actions:

• Generates an Emergency Mode alert.

• Expires Snapshots at a faster rate than normal.

• Prevents new volume creation.

• Volumes are taken oine. Data cannot be written to or read from volumes.

To support recovery eorts, volumes can respond to Space Recovery requests from the server or Storage Manager to release

unused blocks of data.

CAUTION: Because Emergency Mode prevents all server IO, Emergency Mode is service aecting. Administrators must

take special care to continually monitor free space on the

Storage Center and add or free up space as needed to avoid

reaching the Emergency Mode threshold.

Troubleshoot Conservation or Emergency Mode

To resolve conservation or emergency mode, reclaim consumed disk space.

About this task

Perform each step, then wait a few minutes and check available disk space.

Steps

1. Delete any unnecessary volumes and then empty the recycle bin.

2. Expire unnecessary Snapshots.

3. If applicable, run a manual space recovery on Windows server volumes.

Next step

If these steps do not resolve conservation or emergency mode, contact Dell Technical Support.

Preventing Low Space Modes

Manage disk space to prevent a Storage Center from entering Conservation or Emergency mode.

Prevent low space issues using these tips:

• Empty the recycle bin regularly.

• Lower the frequency of snapshots or set snapshots to expire earlier.

• Change the storage prole to a more space ecient prole. Available proles might include Low Priority (Tier 3) and Maximize

Eciency.

• Congure a threshold denition to create an alert when space starts to get low.

• Run Space Recovery on Windows volumes through the Storage Manager Server Agent.

• Migrate volumes from a pagepool with a full tier to a dierent pagepool with more free space.

• Delete any unnecessary volumes.

• If Data Reduction is licensed, enable Compression or Deduplication with Compression on some volumes.