in the most recent "Data Domain: DD OS Software Versions" it states: "DDOS 6.2: DD160, DD620, DD990, DD2200, DD2500, DD3300, DD4200, DD4500, DD6300, DD6800, DD7200, DD9300, DD9500, DD9800 & DDVE   DDOS 7.2 & Above : DD3300, DD4200, DD4500, DD6300, DD6800, DD6900, DD7200, DD9300, DD9400, DD9500, DD9800, DD9900 & DDVE" So officially only a dd990 would support ddos6.2.the dd890 and dd860's have an EOSS from March 31 2019 (but then again they are both from 2011 or so...). You might use the install precheck option when you uploaded the ddos 6.2 rpm, I assume it might object to being installed on the DD's in question if and when it performs a hardware type check.I can't directly find it would support the latest and greatest 6.2 but KB articles from 2019 state circumstantial evidence as the dd89- and 860 are mentioned at the bottom while dealing with the "Data Domain: DD OS Software Versions" in which it talks about ddos 6.2.0 up until 6.2.0.30 at the time. so who knows it might accept that later version as well. If not then very likely still 6.2.0.30 (with all its bugs and issues that is).
We currently have a DD 990 system running DD OS 6.1.2.70-654892. We have an issue where the FS wont restart. We noticed following errors. Fri Dec 31 15:26:34 2021 CRITICAL Environment Enclosure=1 EVT-ENVIRONMENT-00035: Critical failure caused an unexpected system shut downFri Dec 31 15:32:38 2021 ALERT Filesystem EVT-FILESYS-00010: DDFS process died after reboot; restarting. Fri Dec 31 15:37:42 2021 ALERT Filesystem EVT-FILESYS-00011: DDFS process died; restarting.Also see following messages  in logs. Jan  1 11:38:08 localhost /usr/sbin/irqbalance: WARNING: MSI interrupts found in /proc/interrupts.Jan  1 11:45:46 st-dd1 ddfs[12942]: ERROR: MSG-INTRNL-00001: PANIC: ddr/segstore/ss_nvram.c: ssnv_restore: 1025: Fatal Error.Jan  1 11:49:03 st-dd1 ddfs[20002]: ERROR: MSG-INTRNL-00001: PANIC: ddr/segstore/ss_nvram.c: ssnv_restore: 1025: Fatal Error.Jan  1 11:52:33 st-dd1 ddfs[21560]: ERROR: MSG-INTRNL-00001: PANIC: ddr/segstore/ss_nvram.c: ssnv_restore: 1025: Fatal Error.Jan  1 11:56:02 st-dd1 ddfs[23915]: ERROR: MSG-INTRNL-00001: PANIC: ddr/segstore/ss_nvram.c: ssnv_restore: 1025: Fatal Error.Dec 31 15:18:59 localhost /usr/sbin/irqbalance: WARNING: MSI interrupts found in /proc/interrupts.Already attempted reboots multiple times but seeing the same issue where the FS wont restart. Any input on the fix would be greatly appreciated. Thanks,
DD 990 - DD FS wont start