IT29829: 10.1.4 VSNAP CAN SHOW A NEGATIVE USED SPACE WHEN THE POOL IS BACKED BY FILES INSTEAD OF PHYSICAL DISKS

APAR status

• Closed as program error.

Error description

• IBM Spectrum Protect Plus version 10.1.4 vSnap may show a
  negative used pool space. This happens when the pool is
  backed by files created on a share coming from Isilon storage.
  Example:
  ID: 1
  NAME: primary
  POOL TYPE: raid0
  STATUS: ONLINE
  HEALTH: 100
  FREE SPACE: 195.57TB
  USED SPACE: -209892054851.98KB
  This is only a reporting problem. Backups to this specific
  vSnap continue to work as expected.
  Versions affected: 10.1.4
  Keywords: TS002440616
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * IBM Spectrum Protect Plus level 10.1.4                       *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply fixing level when available. This problem is currently *
  * projected to be fixed in IBM Spectrum Protect Plus level     *
  * 10.1.4.179 and 10.1.5                                        *
  ****************************************************************
  

Problem conclusion

• vSnap calculates the capacity of a pool based on the capacity of
  the underlying disks. If a pool is backed by files created in a
  filesystem, vSnap did not correctly take into account the size
  of the files. This resulted in the pool capacity being seen as
  zero, and the used capacity being shown as a negative number.
  The problem has been resolved by updating vSnap to ensure it
  takes file sizes into account when calculating capacity of a
  file-backed pool.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  SP PLUS

• Fixed component ID

  5737SPLUS

Applicable component levels