To me it sounds exactly like a bad RAID controlled in the Xraid. If you're
seeing errors on the side where no data is at all, and you're not putting
any throughput on that side, random hangs could be caused by a
malfunctioning RAID card.
Thanks
Josh
On 3/12/07 1:57 PM, "David Ross" <email@hidden> wrote:
> Here's some data that might explain other AFP hangs or be a new one.
>
> Early XServe G4 1.33 SP 1gb ram 10.4.8.
>
> Ran fine for years.
>
> We recently connected an XRAID. 2x7x400 drives. Both sides setup with
> RAID 5 and a hot spare.
>
> Have had 5 hangs where the entire office locks up as they touch a shared
> item. XServe is still responsive. Well somewhat. When you tell it to
> restart you get a gray screen and have to manually power it off.
>
> System log shows a series of 5 to 10 i/o errors on one of the RAID sides
> that appears to match the time of the lockup and is the last thing in
> the log before the startup entries from the restart.
>
> Checking the AFP logs there has been someone doing copies of at least 50
> 8 meg files either from one share point to another or from their client
> computer to the server. Several have been well over 1/2 gig total. All
> finder copies.
>
> An interesting point is that with at least one of these hangs the i/o
> errors pointed to the side of the XRAID that we have not even used yet
> except to format the space. No user files. Nothing shared. The other i/o
> errors were on the side of the XRAID we're using.
>
> This tells me it is very likely NOT the XRAID box or the cables. Both
> sides of the XRAID are cabled directly to ports on the same FC card
> inside the XServe. So the common point where things come together is the
> FC card.
>
> Which leads me to think the problem is in the XServe. There is something
> about the amount of data being transfered that is triggering the
> problem. Bad FC card, bad memory, OS bug, bus design bug, bus hardware
> failure, or who knows. Maybe the bus is being saturated and something
> isn't dealing correctly with the situation.
>
> I added a gig of ram to try and suppress the issue if it was indeed an
> OS bug of some sort. No go.
>
> Tonight I'll pull the original 1 gig of ram and swap the FC card.
>
> We had planned to retire the XServe this summer after leopard but now I
> wonder if replacing it will solve the issue or just get us to spend our
> dollars sooner than planned without solving the issue.
>
> Any other thoughts?
>
> If this is indeed a bug in the OS or card driver for FC cards it could
> explain a lot of the strange hangs around here. Anyone having these
> issues on G5 or Intel XServes?
>
> David Ross
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