Release Notes

Table 9. Fixed Data Reduction Issues in Storage Center 7.4.2
Issue Description
SCOS-55306 Data progression might become suspended and fail to resume if DPM defragment and data
progression are running simultaneously.
SCOS-54988 Secondary storage data might be erroneously recovered as lost space during data progression.
SCOS-54249 On a storage system running deduplication, the deduplication ratio might be low because of an
issue that prevents the deduplication dictionary from growing.
SCOS-54180 On a storage system with volumes that have many optimized pages, a controller might reset
because of a memory exhaustion issue.
SCOS-54104 Deduplication might fail to occur on a storage system because the Data Optimization
Deduplication Capable attributes are set to false after a storage system is updated to Storage
Center 7.3.4 or later.
SCOS-54101 A RAID restripe might not be able to make progress if there are too many DPM/PPM lost
partial pages.
SCOS-52707 An SC8000 controller with 16 GB of memory might reset if the deduplication dictionary grows
too large.
SCOS-49144 Data progression might stop running or the Storage Center might reset when a payload
checksum failure occurs due to table entries being read incorrectly from memory.
SCOS-49069 In rare instances, increased latency might occur on a storage system if a pagepool
consolidation process is active.
SCOS-48236 A restripe statistic might be incorrect within a 5-minute window during which a copy
completes.
Fixed Issues Related to Hardware
The following issues are fixed in Storage Center 7.4:
Table 10. Fixed Hardware Issues in Storage Center 7.4.20
Issue Description
SCOS-59595 On Chelsio T5 or T6 iSCSI HBAs, the target connection code might prevent the SACK-
permitted option from being set in response to a connection request from a SCSI initiator,
which could impact read I/O performance.
Table 11. Fixed Hardware Issues in Storage Center 7.4.10
Issue Description
SCOS-59862 A storage system with SEDs might fail to initialize after a complete system power cycle.
SCOS-59486 A controller with an MVLAN fault domain and iSCSI QRQ ports might fail to boot because of
an issue with iSCSI QRQ port logic.
SCOS-59111 The iSCSI QRQ interfaces on SCv3000 series and SC5020 storage systems might reset
repeatedly after updating to Storage Center 7.4.2.
SCOS-58697 A controller might reset because of resource contention issues with Chelsio iSCSI HBAs.
SCOS-54645 A link up failure might occur when a Chelsio T5 or T6 iSCSI HBA is connected to a Dell
Networking switch.
Table 12. Fixed Hardware Issues in Storage Center 7.4.2
Issue Description
SCOS-56774 On storage systems that use Chelsio T3 iSCSI HBAs with port two enabled, the HBA might
send TCP Reset commands to remote initiators on the wrong port.
SCOS-56549 If self-encrypting drives (SEDs) are being managed while the Parent Folder is being changed
from Unsecured to Secured, Storage Center might perform a Crypto Erase the SEDs.
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