SATA DMA errors on second ICH10 bus

[Oliver Fromme]

Josh Carroll wrote:
 > I've got 2 WD black drives on order to replace these two ST31000340AS,
 > and originally my intention was to use them for separate filesystems,
 > but I think I'll gmirror them now, to be safe(er).

Some people recommend to use different vendors for the
components of disk mirrors, in order to reduce the
likelihood that both drives will fail at about the same
time due to a firmware bug or similar.

That advice seems to be particularly valuable given the
current firmware problems that particular Seagate disks
are exhibiting.

For example, I've got these in a server:

# atacontrol list | grep ad
    Master:  ad0 <SAMSUNG HD160JJ/WU100-41> Serial ATA II
    Master:  ad1 <ST3160811AS/3.AAE> Serial ATA v1.0
# diskinfo ad0 ad1
ad0     512     160041885696    312581808       310101  16      63
ad1     512     160041885696    312581808       310101  16      63
# gmirror status
      Name    Status  Components
mirror/gm0  COMPLETE  ad0
                      ad1

Best regards
   Oliver

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