Yes, this is likely a flakey scsi bus- a data overrun for a write
generally means that the bus stayed in DATA OUT phase after all data
scheduled to go had been sent.

The 'adapter resource shortage' has already been explained.

There's nothing wrong with isp cards. The 1020 is old and has signalling
issues. The 1040s on forward are pretty damned solid.


On Mon, 11 Aug 2003, Sean Davis wrote:

> Can anyone think of any reason for this to happen? I'm pretty sure it
> happened while I was building -current. Sources are on NFS. Swap is on sd0b.
>
> isp0: data overrun for command on 0.0.0
> isp0: BOTCHED cmd for 0.0.0 cmd 0xa datalen 65536
> sd0(isp0:0:0:0): generic HBA error
>
> isp0 is:
> isp0 at pci1 dev 1 function 0: QLogic 1020 Ultra Wide SCSI HBA
> isp0: interrupting at kn20aa irq 1
> scsibus1 at isp0: 16 targets, 8 luns per target
>
> and sd0 is:
> sd0 at scsibus1 target 0 lun 0: <WDIGTL, WDE4550 ULTRA2, 1.22> disk fixed
> sd0: 4340 MB, 6932 cyl, 6 head, 213 sec, 512 bytes/sect x 8890000 sectors
> sd0: sync (100.00ns offset 12), 16-bit (20.000MB/s) transfers, tagged
> queueing
>
> I noticed no problems because of it, and the build completed successfully. I
> didn't even notice the error messages until a while later, so I can't be
> 100% certain they happened during the build, but that was the heaviest
> period of disk I/O since the machine was last booted so I think that might be
> it.
>
> As I asked with the previous errors I saw, on a previous boot, running
> bonnie:
> isp0: Request Queue Overflow++
> sd0(isp0:0:0:0): adapter resource shortage
>
> Is this something I should worry about?
>
> I plan to replace the qlogic 1020s with an LSI LSIU160 53c1010 card as soon
> as I have the money, but until then I'm stuck with the isp controllers, as
> SRM doesn't support anything except a very few chipsets. I might be getting
> a <= 1gig 50pin drive from a friend to use for the kernel/bootloader hooked
> up to the first isp controller, and have it load root/usr/var/home from the
> WD drive on an Adaptec 2940UW in the meantime.
>
> --
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>