ATA command timeouts after disk has gone sleeping

Hi all
I've configured myself a NAS, which is infrequently accessed, so I set the standby timer of the disks to 241 (30 minutes) using hdparm.
for i in /dev/sd?; do
hdparm -S 241 $i > /dev/null
done
After 30 minutes the disks go to sleep, no problem there, but once they are accessed again, the first command sent to the disk time out:
ata7.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata7.00: cmd b0/d8:00:00:4f:c2/00:00:00:00:00/00 tag 0
res 40/00:00:00:f1:00/00:00:00:00:00/00 Emask 0x4 (timeout)
ata7.00: status: { DRDY }
ata7: hard resetting link
ata7: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata7.00: max_sectors limited to 256 for NCQ
ata7.00: max_sectors limited to 256 for NCQ
ata7.00: configured for UDMA/133
sd 6:0:0:0: timing out command, waited 7s
ata7: EH complete
SCSI device sdg: 1953525168 512-byte hdwr sectors (1000205 MB)
sdg: Write Protect is off
sdg: Mode Sense: 00 3a 00 00
SCSI device sdg: drive cache: write through
After that the drives work fine again. The command timeout is 7 seconds, which seems too low because the disks need some time to spin up.
Two questions:
Can the ATA command timeout be increased?
If the command fails, is it retried?
Thanks,
Glenn

The G5 Discussion is here while this is devoted to Mac Pro, hence the confusion. The MP doesn't use cables, just trays that slide in.
Is it possible you have backups you can boot from? (hint, hint). Or Disk Warrior 4? would also be 'nice.'
Hard restarts DO trash files and directories. And never make changes w/o a bootable backup. Maybe a couple FW drives. (One person yesterday backed up his problem G5 drive only that turned his 'good backup' into an unbootable drive also, and didn't have a 2nd backup - which can happen and why you don't want to rely on just one).

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