I've got a perc 6/i that had a 6 drive raid 5 array which was being expanded to 7 drives. Another application rebooted the system, and it hung at the raid bios (couldn't get into config, would stop after printing FW version). After trying any combination of things to get it to boot, ended up pulling the battery to flush the memory and now it's back online.

My array has now been left as foreign and cannot be imported from the bios or megaraid. In the logs I've got:

12/22/13 2:44:40: EVT#15326-12/22/13 2:44:40: 218=Foreign Configuration Detected
12/22/13 2:44:41: ForeignReadAfterImport requested for guidIndex 0xff.
12/22/13 2:44:42: ddfValidateForCfg: ldAfterImport 1, invalidLd 1
12/22/13 2:44:42: **** PinnedCacheDataStructures->pinned_cache_present 0
12/22/13 2:44:42: **** total_num_vds_pinned 0 number_pinned_vds_found_during_import 0 NUMBER OF DRIVES TO IMPORT 0
12/22/13 2:44:42: **** NUMBER OF PINNED EQUALS NUMBER OF DRIVES TO IMPORT OR NO PINNED CACHE !!!!
12/22/13 2:44:42: createMegaraidCfg: ***** attempting to import a normal VD with targetID 0 while have all vds with pinned cache or no pinned cache
12/22/13 2:44:42: createMegaraidCfg: ***** attempting to import a normal VD with targetID 255 while have all vds with pinned cache or no pinned cache
12/22/13 2:44:42: isForeignCfgComplete: Foreign - totAr: 0x2, totLd: 0x2, totSpare: 0x0
12/22/13 2:44:42: isForeignCfgComplete: MR_CFG - totAr: 0x2, totLd: 0x2, totSpare: 0x0
12/22/13 2:44:42: ForeignReadAfterImport requested for guidIndex 0xff.
12/22/13 2:44:42: ddfValidateForCfg: ldAfterImport 1, invalidLd 1
12/22/13 2:44:42: **** PinnedCacheDataStructures->pinned_cache_present 0
12/22/13 2:44:42: **** total_num_vds_pinned 0 number_pinned_vds_found_during_import 0 NUMBER OF DRIVES TO IMPORT 0
12/22/13 2:44:42: **** NUMBER OF PINNED EQUALS NUMBER OF DRIVES TO IMPORT OR NO PINNED CACHE !!!!
12/22/13 2:44:42: createMegaraidCfg: ***** attempting to import a normal VD with targetID 0 while have all vds with pinned cache or no pinned cache
12/22/13 2:44:42: createMegaraidCfg: ***** attempting to import a normal VD with targetID 255 while have all vds with pinned cache or no pinned cache
12/22/13 2:44:42: isForeignCfgComplete: Foreign - totAr: 0x2, totLd: 0x2, totSpare: 0x0
12/22/13 2:44:42: isForeignCfgComplete: MR_CFG - totAr: 0x2, totLd: 0x2, totSpare: 0x0
12/22/13 2:44:45: EVT#15327-12/22/13 2:44:45: 218=Foreign Configuration Detected
12/22/13 2:44:45: ForeignImport requested for guidIndex 0xff.
12/22/13 2:44:45: ddfValidateForCfg: ldAfterImport 1, invalidLd 2
12/22/13 2:44:45: **** PinnedCacheDataStructures->pinned_cache_present 0
12/22/13 2:44:45: ld 0 state 3
12/22/13 2:44:45: ld 0 targetId ff LdMapTargetIdToLd 0
12/22/13 2:44:45: ld 1 targetId ff LdMapTargetIdToLd 0
12/22/13 2:44:45: **** total_num_vds_pinned 0 number_pinned_vds_found_during_import 0 NUMBER OF DRIVES TO IMPORT 0
12/22/13 2:44:45: **** NUMBER OF PINNED EQUALS NUMBER OF DRIVES TO IMPORT OR NO PINNED CACHE !!!!
12/22/13 2:44:45: createMegaraidCfg: ***** attempting to import a normal VD with targetID 255 while have all vds with pinned cache or no pinned cache
12/22/13 2:44:45: createMegaraidCfg: ***** attempting to import a normal VD with targetID 255 while have all vds with pinned cache or no pinned cache
12/22/13 2:44:45: isForeignCfgComplete: Foreign - totAr: 0x1, totLd: 0x2, totSpare: 0x0
12/22/13 2:44:46: isForeignCfgComplete: MR_CFG - totAr: 0x0, totLd: 0x0, totSpare: 0x0
12/22/13 2:44:46: ForeignImport: Nothing to import
12/22/13 2:44:46: EVT#15328-12/22/13 2:44:46: 396=Foreign configuration auto-import did not import any drives
12/22/13 2:44:51: EVT#15329-12/22/13 2:44:51: 113=Unexpected sense: PD 01(e0xff/s1) Path 1221000001000000, CDB: 12 00 00 00 7f 00, Sense: 5/24/00
12/22/13 2:44:51: Raw Sense for PD 1: 70 00 05 00 00 00 00 0a 00 00 00 00 24 00 00 00 00 00
12/22/13 2:44:51: DEV_REC:IllegalReq- CDB: 12 0 0 0 7f 0 0 0 34 0
12/22/13 2:44:51: ILLEGAL REQ: pRdm(a06b2400) Cmd=3, Sns=a06b2440 DevId[1] Tgt 1
12/22/13 2:44:51: info: 0, aslen= a, cmdSpecific[3]= 0 [2]= 0 [1]= 0 [0]= 0
12/22/13 2:44:51: asc=24, Ascq 0, Sks: 0, fp[0]= 0, fp[1]= 0

Anyone able to help here? Do I have any hope of recovery? I've been reading about "retagging" but am wary of trying since it was in the middle of expanding. Not sure if telling it to do a 7 drive array would be smart?