Release Notes

Issue Description
SCOS-24167 A storage system with deduplication enabled volumes might experience performance issues during the
deduplication page manager clean-up process.
SCOS-22379 The compression and deduplication page manager defragmentation process might cause high CPU
utilization and impact system performance.
SCOS-21671 Rehydration of deduplicated or compressed data does not place the data in the tier specified by the
volume storage profile.
Table 12. Fixed Data Reduction Issues in Storage Center 7.2.1
Issue Description
SCOS-31054 Enabling deduplication on a volume that is part of a replication might result in hundreds of
Ingestion failure due to SecondaryStorage infrastructure is not ready
log messages.
SCOS-22590 A storage system running Storage Center 7.1.3 with deduplication enabled might experience
performance issues during the defragmentation portion of Data Progression.
SCOS-21275 After updating from Storage Center 7.1.1, a storage system might fail to enable deduplication on some
volumes.
SCOS-21160 On a storage system with compression enabled, the secondary storage deactivate process might fail
to flush prefetch pages.
SCOS-21129 A storage system might incorrectly report snapshot bad pages when the system is low on memory.
SCOS-20960 The IOPS of a storage system might decrease and I/O latency might increase significantly because of
high CPU usage during the Data Progression defragmentation process.
SCOS-20449 A controller reset might occur because of out of range memory access during the Data Progression
defragmentation process.
SCOS-20240 Data Progression might fail to move pages to tier 3 for volumes that are larger than 32 TB. If a
specific history has multiple view volumes, Data Progression might fail to move pages for volumes
smaller than 32 TB.
SCOS-20075 A storage system with Flash Optimized storage types and deduplication enabled might suffer an
outage during On Demand Data Progression if the system is low on space in tier 1 RAID 10.
SCOS-19570 A storage system running Storage Center 7.1 with compression enabled and over 25 TB of data
ingested into the deduplication process might suffer from I/O delays because of high CPU usage at
the end of Data Progression.
SCOS-19002 Enabling deduplication on a storage system while one controller is in a failed state might result in
volumes that appear to be deduplicated, when in fact they are not deduplicated.
SCOS-14931 On Demand Data Progression might fail to complete successfully when deduplication is enabled on a
volume.
SCOS-13649 Volumes on separate controllers might show the same deduplication reduction rates when the
deduplication reduction rates are different.
SCOS-13159 Deduplication and compression might take volumes offline when responses to storage type status are
incorrect.
Fixed Issues Related to Hardware
The following hardware issues are fixed in Storage Center 7.2:
Table 13. Fixed Hardware Issues in Storage Center 7.2.40
Issue Description
SCOS-45629 If unsupported drives were added to a storage system by technical support using CLI commands, the
drives might go offline when the Storage Center software is updated on the storage system.
SCOS-45155 While attempting to gather enclosure logs from an SC400 and SC420 expansion enclosure, the
expansion enclosure might unexpectedly reset.
Dell Storage Center 7.2 Release Notes 13