IDS crashes on Windows

Guys- I've been seeing these error messages show up in my online log. Several occur in a row, and either clear themselves up or crash the engine. I am thinking that the RAID1 Array running the database is getting flakey, but how can you tell which drive, or if it's the RAID card? I am running IDS 9.30.TC2 (old, I know. I'll be installing 9.40.TC5 over Christmas) on Windows 2000 server. We have enabled the Windows hardware monitoring, but nothing ever shows up in the event log. I have run defrags and thorough scandisks. I have also blown away all of the chunks, recreated the files and restored a backup. The effect remains the same, every four or five days, it starts to generate errors and eventually dies. Here is an extract from my online.log: 19:41:08 KAIO: error in kaio_WRITE, kaiocbp = 0x14ffe1c8, errno = 0 19:41:08 fildes = 480 (gfd 6), buf = 0x147A7000, nbytes = 4096, offset= 126353408 19:41:09 KAIO: error in kaio_WRITE, kaiocbp = 0x14feee94, errno = 0 19:41:09 fildes = 480 (gfd 6), buf = 0x156BC000, nbytes = 4096, offset= 190603264 19:41:09 KAIO: error in kaio_WRITE, kaiocbp = 0x1528506c, errno = 0 19:41:09 fildes = 480 (gfd 6), buf = 0x15287000, nbytes = 32768, offset= 225316864 19:41:09 KAIO: error in kaio_WRITE, kaiocbp = 0x14ffe280, errno = 0 19:41:09 fildes = 480 (gfd 6), buf = 0x0EE73000, nbytes = 4096, offset= 560599040 19:41:09 KAIO: error in kaio_WRITE, kaiocbp = 0x14ffe110, errno = 0 19:41:09 fildes = 480 (gfd 6), buf = 0x13EF3000, nbytes = 4096, offset= 593719296 19:41:10 Checkpoint Completed: duration was 1 seconds. 19:41:10 Checkpoint loguniq 140098, logpos 0x1a3018 19:41:10 Maximum server connections 13 19:45:39 KAIO: error in kaio_WRITE, kaiocbp = 0x14ff382c, errno = 0 19:45:39 fildes = 448 (gfd 14), buf = 0x0D8EB000, nbytes = 4096, offset= 169680896 19:46:09 Checkpoint Completed: duration was 0 seconds. 19:46:10 Checkpoint loguniq 140098, logpos 0x1a9018 19:46:10 Maximum server connections 13 <<Informix Dynamic Server>>> Logical Log 140098 Complete. 19:48:03 Logical Log 140098 Complete. 19:51:14 Checkpoint Completed: duration was 0 seconds. 19:51:14 Checkpoint loguniq 140099, logpos 0xcb018 19:51:15 Maximum server connections 13 19:52:08 KAIO: error in kaio_WRITE, kaiocbp = 0x14fed49c, errno = 0 19:52:08 fildes = 468 (gfd 4), buf = 0x0D8DA000, nbytes = 36864, offset = 3375104 19:52:09 KAIO: error in kaio_WRITE, kaiocbp = 0x14fed49c, errno = 0 19:52:09 fildes = 468 (gfd 4), buf = 0x0D8DA000, nbytes = 36864, offset = 3375104 19:52:09 Assert Failed: I/O error, Mirror Chunk 'C:\\IFMXDATA\\DDGPLC\\rootdbs_dat.000' -- Offline 19:52:09 Informix Dynamic Server Version 9.30.TC2 19:52:09 Who: Session(34969, plcdata@nbpdc-cs1.corpnbp.nationalbeef.com, 118028, 0) Thread(34986, sqlexec, 0, 1) File: rsbuff.c Line: 4086 19:52:09 Results: Chunk is now unusable 19:52:10 Action: Repair and restore from mirror or archive 19:52:10 stack trace for pid 10112 written to C:\\tmp\\af.8c92b448 19:52:17 See Also: C:\\tmp\\af.8c92b448 19:52:17 I/O error, Mirror Chunk 'C:\\IFMXDATA\\DDGPLC\\rootdbs_dat.000' -- Offline 19:52:17 I/O error, Mirror Chunk 'C:\\IFMXDATA\\DDGPLC\\rootdbs_dat.000' -- Offline 19:52:19 Assert Failed: Chunk 1 is being taken OFFLINE. 19:52:19 Informix Dynamic Server Version 9.30.TC2 19:52:19 Who: Session(34969, plcdata@nbpdc-cs1.corpnbp.nationalbeef.com, 118028, 0) Thread(34986, sqlexec, 0, 1) File: rsmirror.c Line: 1766 19:52:19 Results: Dynamic Server must abort 19:52:19 Action: Reinitialize shared memory 19:52:19 stack trace for pid 10112 written to C:\\tmp\\af.8c92b448 19:52:25 See Also: C:\\tmp\\af.8c92b448 19:52:25 Chunk 1 is being taken OFFLINE. 19:52:25 Chunk 1 is being taken OFFLINE. 19:52:25 Assert Failed: INFORMIX-OnLine Must ABORT Critical media failure. The af files contain the same info. I'll be calling tech support, as well. Thanks in advance, if someone has any ideas. --EEM sending to informix-list