Looks like I may have to eat humble pie. I was possibly wrong on the no SCSI problems.
Reran the dump this morning after a power cycle on the host. It failed with the usual error. Found the following in dmesg:

Pending list:
  3 SCB_CONTROL[0x40] SCB_SCSIID[0x57] SCB_LUN[0x0]
Kernel Free SCB list: 1 0
Untagged Q(5): 3

scsi1:0:5:0: Attempting to queue an ABORT message
CDB: 0xa 0x1 0x0 0x0 0x40 0x0
scsi1: At time of recovery, card was not paused
>>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<
scsi1: Dumping Card State while idle, at SEQADDR 0x8
Card was paused
ACCUM = 0x4, SINDEX = 0x57, DINDEX = 0x26, ARG_2 = 0x0
HCNT = 0x0 SCBPTR = 0x0
SCSIPHASE[0x0] SCSISIGI[0x0] ERROR[0x0] SCSIBUSL[0x0]
LASTPHASE[0x1] SCSISEQ[0x12] SBLKCTL[0xa] SCSIRATE[0x0]
SEQCTL[0x10] SEQ_FLAGS[0xc0] SSTAT0[0x0] SSTAT1[0x8]
SSTAT2[0x0] SSTAT3[0x0] SIMODE0[0x8] SIMODE1[0xa4]
SXFRCTL0[0x80] DFCNTRL[0x0] DFSTATUS[0x89]
STACK: 0x0 0x163 0x178 0x3
SCB count = 4
Kernel NEXTQSCB = 2
Card NEXTQSCB = 2
QINFIFO entries:
Waiting Queue entries:
Disconnected Queue entries: 0:3
QOUTFIFO entries:
Sequencer Free SCB List: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Sequencer SCB Info:
  0 SCB_CONTROL[0x44] SCB_SCSIID[0x57] SCB_LUN[0x0] SCB_TAG[0x3]
  1 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
  2 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
  3 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
  4 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
  5 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
  6 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
  7 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
  8 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
  9 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 10 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 11 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 12 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 13 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 14 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 15 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 16 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 17 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 18 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 19 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 20 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 21 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 22 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 23 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 24 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 25 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 26 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 27 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 28 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 29 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 30 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
 31 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff]
Pending list:
  3 SCB_CONTROL[0x40] SCB_SCSIID[0x57] SCB_LUN[0x0]
Kernel Free SCB list: 1 0
Untagged Q(5): 3

<<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>>
(scsi1:A:5:0): Device is disconnected, re-queuing SCB
Recovery code sleeping
(scsi1:A:5:0): Abort Message Sent
(scsi1:A:5:0): SCB 3 - Abort Completed.
Recovery SCB completes
Recovery code awake
aic7xxx_abort returns 0x2002
st0: Error with sense data: <6>st0: Current: sense key: Unit Attention
    Additional sense: Power on, reset, or bus device reset occurred

Im interested in hearing what people can suggest to try and resolve this.