GLYPH<SM590000> IBM FlashSystem 9100 has the ability to create a volume which isn’t compressed, de-duped or thin provisioned (so a fully allocated volume). Simply create some of these volumes to reserve an amount of physical space, you probably want to name them something like “emergency buffer space”. Then if you are reaching the limits for physical capacity you can simply delete one or more of these volumes to give yourself a temporary reprieve. 

Warning:  Running completely out of space can be a very severe situation. Recovery can be extremely complicated and time-consuming. For this reason, it is imperative that proper planning and monitoring be done to avoid reaching this condition. 

## 10.9.2 Recovery 

The following sections describe the process for recovering from OOPS. 

## Reclaiming and unlocking 

After you’ve assessed and accounted for storage capacity, the first step is to contact IBM Support who can aid in unlocking the read only mode and restoring the operation. The reclamation task can take a long time to run, and larger flash arrays will take longer to recover than smaller ones. 

## Freeing up space 

There are several ways to reduce the amount of consumed space once the IBM FlashSystem 9100 has been unlocked by IBM support. 

To recover from Out of Space conditions on Standard Pools, these are the steps for the user: 

1. Add more storage to the system if possible. 

2. Migrate extents from the write protected array to other non-write protected MDisks with enough extents. This could be an external back end storage array. 

3. Migrate volumes with extents on the write protected array to another pool. 

4. Deleting unrequired volumes to free space. 

5. Bring the volumes in the pool back online using a Directed Maintenance Procedure . 

## Deleting unneeded volumes 

If possible, within the pool (managed disk group) on the IBM FlashSystem 9100, delete any unnecessary volumes. The IBM FlashSystem 9100 v8.2 supports SCSI unmap so deleting volumes will have space reclamation benefits using this method. 

## Migrating volumes 

If possible, moving volumes from the IBM FlashSystem 9100 pool to another external pool can free up space in the IBM FlashSystem 9100 pool to allow for space reclamation. As this volume moves into the new pool, its previously occupied flash extends will be freed up (via SCSI unmap), which then goes to provide more free space to the IBM FlashSystem 9100 enclosure to be configured to a proper provisioning to support the compression ratio. 

Further information on types of recovery can be found in the IBM Support Technote here: 

Out of Space Recovery 

