Adaptec AIC-7896U2/7897U2 controller throws SCSI errors in kernel log

[Alex Greg]

Hi,


I recently purchased a 1U VA Linux server (second hand) with Fedora Core 
1 installed. It's been running more or less OK for a while, but 
occasionally when I'm SSH'ed into the server (and editing a file in vi, 
or whatever) the SSH sessions locks up and becomes unresponsive. The 
machine is still pingable at this point, and when a new SSH connection 
is made to the machine, it takes a long time to produce the password prompt.


Whilst investigating this issue, I ran dmesg and came across the 
following (attached). This seems to indicate a problem with the SCSI 
system (the machine has 2 x 9GB SCSI drives attached, nothing else on 
the SCSI bus). The output from lspci is:


00:00.0 Host bridge: Intel Corp. 440GX - 82443GX Host bridge
00:01.0 PCI bridge: Intel Corp. 440GX - 82443GX AGP bridge
00:0b.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] 
(rev 08)
00:0c.0 SCSI storage controller: Adaptec AIC-7896U2/7897U2
00:0c.1 SCSI storage controller: Adaptec AIC-7896U2/7897U2
00:0e.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] 
(rev 08)
00:12.0 ISA bridge: Intel Corp. 82371AB/EB/MB PIIX4 ISA (rev 02)
00:12.1 IDE interface: Intel Corp. 82371AB/EB/MB PIIX4 IDE (rev 01)
00:12.2 USB Controller: Intel Corp. 82371AB/EB/MB PIIX4 USB (rev 01)
00:12.3 Bridge: Intel Corp. 82371AB/EB/MB PIIX4 ACPI (rev 02)
00:14.0 VGA compatible controller: Cirrus Logic GD 5480 (rev 23)
01:0f.0 PCI bridge: Digital Equipment Corporation DECchip 21150 (rev 06)

In addition, I saw about 500 of this error in the dmesg output at one point:


hw tcp v4 csum failed


Does anyone have any ideas what could be causing the SSH sessions to 
freeze, and the other errors from dmesg?


Regards,


-- Alex
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