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gpfs@us.ibm.com
gpfs@us.ibm.com
662 Posts

Pinned topic Flashes (Alerts): IBM Spectrum Scale Active File Management (AFM) and AFM Asynchronous Disaster Recovery (ADR) issues which may result in undetected data corruption

‏2018-06-29T14:30:47Z |

Abstract
IBM has identified certain issues affecting Active File Management (AFM) and AFM Asynchronous Disaster Recovery (ADR) in IBM Spectrum Scale which may result in undetected data corruption.
1. AFM may intermittently read files from the home cluster incorrectly if the replication factor is more than one at the cache cluster, which may result in undetected data corruption.
2. AFM cache may incorrectly read an HSM migrated file from the home cluster due to the incorrect calculation of the file sparseness information, potentially resulting in undetected data corruption.
3. AFM mmafmctl Device resync/failover and AFM ADR mmafmctl Device changeSecondary commands may miss copying data to the home or secondary cluster (from the other cluster) when the in-memory queue is dropped with pending in-place writes.
4. AFM Asynchronous Disaster Recovery (ADR) could cause some files to be missing from the RPO snapshot at the secondary if recovery was run from the recovery+RPO snapshot.
5. AFM may not replicate the data when the dm_write_invis() API is used to write. In addition, the dm_read_invis() API may read incorrect data if the file is not already cached.

See complete bulletin at:  http://www-01.ibm.com/support/docview.wss?uid=ibm10713675