First of all my long story in a short form:
We used to have about 10 EVA 8100 storages for almost 10 years in our production environment and I personally like them very much. We had a lot of spare parts, typical configuration (168x450GB/15K) and my job was just about to replace failed drives and add it to existing groups.
Anyway times go on, performance metrics, datacenters space and energy price matters, so our "EVA beasts" were all replaced by some IBM stuff. Actually we left one EVA 8100 in some remote location - it was fine since some planned power maintenance which required shutdown of all IT stuff, including EVA. It wasn't a nice surprice when storage asked for a WWN/checksum after powering it up again. My coleagues doing this operation were completely astonished. I had some notes about checksum (I used to note down such informations), but unfortunately I was like "10 timezones away from home" having first day of my holiday...
Finaly data was restored from backup and I found WWN/checksum when I was back at work, but we were fealing uncomfortable, so we decided to build some EVA CHECKSUM CRACKER. Let me show it for those who still love EVA 8100 storages.
EVA 8100 controller "desktop version" with front panel connected to ParpberryPi zero (radiometrix and some other stuff is from another project):
Python script (most of the code - main loop - done by friend of mine Pawel):
Checksum bruteforceing for a given WWN:
Script in (successful) action:
The script tries all checksum combinations for a given WWN checking some LED on front panel. What took me quite a long time was tuning of how fast RaspberryPi can "click" - our cracker have some proven delays between "clicks" to not drop anything which happen when you go too fast (it was designed for human and "finger operation").
PS: If you recognize pcb below it means you have been looking for some way to reprogram EVA 8100 battery. You may find some movie on Youtube about how to clear PIC eeprom for EVA4400 battery (by Christian from Switzerland). Unfortunatelly I still can't do this for 8100
