As an update:I took the plunge and powered all down.Chained on a second md1200, and brought it all back up.I had to adopt the foreign drives, reboot, then use the BIOS level raid controller interface to build a second VD.I could not expand the current VD, and apparently that's a limitation to the perc h800 I have.(fully aware of older hardware restrictions).With a second VD, I was able to make another datastore in ESXI and, all is working great.Thank you!  Still nervous adding hardware, but other than the LENGTHY initialization time for a 37tb raid 6...it went smooth.
I'm running an r620 with esxi, connected to an MD1200 running RAID6, connected via perc h800I need to add more storage and have 2 more MD1200s.My question is more on 'how'.Can I just chain the 2 new enclosures full of drives to the current, power them all on, then expand my RAID6 via OMSA somehow?And without data loss?I've read about expanding within an enclosure, but I've never chained 2 or 3 together while one has data already.Wisdom appreciated!
Expanding md1200 Raid6 with second enclosure