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Oracle Linux: ISCSI Disks Become Unusable When connecting to DBackup Software from SCUTECH (Doc ID 2875808.1)

Last updated on JUNE 09, 2022

Applies to:

Linux OS - Version Oracle Linux 7.0 with Unbreakable Enterprise Kernel [3.8.13] and later
Linux x86-64
Linux x86
Linux ARM 64-bit


ISCSI disks become unusable when connecting to DBackup which is a backup software supporting iSCSI protocol from SCUTECH(鼎甲). In tcpdump data captured from outage time, below symptom can be observed after disabling TCP SACK, 

The iSCSI server simply ignores the large packet NO.117 and only acknowledged  till No.116. The iSCSI client tried to retransmit the subsequent packets(NO.117 and NO.118) several times then give up.



This might be observed after OS upgrade on iSCSI client machine.


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