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Date: Sat, 24 Nov 2007 13:55:59 +0100
From: Cedric Tabary <lists@grumly.eu.org>
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Subject: twa / zfs / pci bus timeout
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I have 10 sata disks as JBOD on a 3ware 9500S.
Motherboard is ASUS P5WDG2-WS-PRO with 64 bit pci ports.

7.0-BETA3 FreeBSD 7.0-BETA3 #4: Sat Nov 17 01:00:37 CET 2007
amd64
SCHED_ULE
without WITNESS and INVARIANTS

  pool: goinfre
 state: ONLINE
 scrub: scrub stopped with 0 errors on Sat Nov 24 12:41:25 2007
config:

        NAME        STATE     READ WRITE CKSUM
        goinfre     ONLINE       0     0     0
          raidz2    ONLINE       0     0     0
            da0     ONLINE       0     0     0
            da1     ONLINE       0     0     0
            da2     ONLINE       0     0     0
            da3     ONLINE       0     0     0
            da4     ONLINE       0     0     0
            da5     ONLINE       0     0     0
            da6     ONLINE       0     0     0
            da7     ONLINE       0     0     0
            da8     ONLINE       0     0     0
            da9     ONLINE       0     0     0

tw_cli output :
Unit  UnitType  Status         %RCmpl  %V/I/M  Stripe  Size(GB)  Cache AVrfy
------------------------------------------------------------------------------
u0    JBOD      OK             -       -       -       372.611   OFF OFF    
u1    JBOD      OK             -       -       -       372.611   OFF OFF    
u2    JBOD      OK             -       -       -       372.611   OFF OFF    
u3    JBOD      OK             -       -       -       372.611   OFF OFF    
u4    JBOD      OK             -       -       -       372.611   OFF OFF    
u5    JBOD      OK             -       -       -       372.611   OFF OFF    
u6    JBOD      OK             -       -       -       372.611   OFF OFF    
u7    JBOD      OK             -       -       -       372.611   OFF OFF    
u8    JBOD      OK             -       -       -       372.611   OFF OFF    
u9    JBOD      OK             -       -       -       372.611   OFF OFF    

I experience pci bus timout messages when I do lots of IO on zfs
(rsync, scrub or samba copy)
kernel: twa0: DEBUG: (0x04: 0x0215): PCI bus timeout: retry=1
kernel: twa0: DEBUG: (0x04: 0x0215): PCI bus timeout: retry=1

Is that a bug ? or crappy hardware ?

Regards.
Cédric