> We got old Mylex DAC960PD-Ultra-raid-adapter and have tried to use it
> with FreeBSD 4.2-stable and 5.0-current. Adapter is configured with
> three luns 5+5*9G, 8+8*9G (raid5) and 1+1*2G (mirrored boot disk).
> All 9G disks are quite old Seagate Barracuda 9 disks ST19171W.  System
> is working quite well but under heavier load we start to get scsi
> errors from luns.
> sense = 4 asc = 3 asq = 0
> sense = 1 asc = 3 asq = 0
> sense = 3 asc = 12 asq = 0
> sense = 3 asc = 11 asq = 0

Your disks just aren't up to this sort of workload.

> This is not so bad but 5-30 minutes after this command system will
> always panic.
> cd /uu ; dump 0buf 126 - /w | restore xbf 126 -
> mode = 0100644, inum = 720391, fs = /uu
> panic: ffs_valloc: dup alloc

This looks like memory or PCI data corruption.  You don't say how you're 
generating this load, or what the motherboard is, but I suspect that you 
may have hardware issues here.

One question - I assume you're not seeing any read error diagnostics from 
the Mylex driver (other than the disk errors?)

... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also.  But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view.  [Dr. Fritz Todt]
           V I C T O R Y   N O T   V E N G E A N C E

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