Re: [RFT][PATCH v7] sata_mv: convert to new EH

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On Fri, 13 Jul 2007, greg wrote:

> dean gaudet <dean <at> arctic.org> writes:
> > if you've got any other workload you'd like me to throw at it, 
> > let me know.  
> 
> I've had a few problems with the driver in 2.6.20 (fc6xen x86_64). The machine 
> tended to lock up after a random period of time (from a few minutes upwards), 
> without any messages. Performing a smartctl on all the disks, or leaving smartd 
> running, seemed to speed up the rate at which the crash occurred. What I found 
> was that by moving the sata_mv device onto it's own bus (or a bus with two 
> sata_mv devices), the crashes went away. Are you doing tests with the 
> controller sharing a bus with other devices?
> 
> Is there an merit to my observation that it might be an issue with devices 
> sharing a PCI-X bus?
> 
> Cards: Supermicro 5081 (SAT-MV8), Supermicro 6081 (SAT2-MV8), Highpoint 5081 
> (RocketRaid 1820A v1.1). Motherboards: Tyan S2882, AMD 8131 chipset; IBM x206, 
> Intel 6300ESB.

hmm!  i don't seem to have replied to this.

you know, i've seen this problem.  the first time it happened was with a 
promise ultra tx/100 or tx/133 (on a dual k7 box, two controllers on the 
same bus certainly)... a 5 minute cronjob logging HD temperatures via 
smart would occasionally cause one of the disks to just disappear, return 
errors on every request, and required a reboot to rediscover it.  
eliminating the cronjob stopped the problem.

i switched to 3ware 750x and the problem went away even with the cronjob 
going.

forward a few years and i ran into the same problem with a 3ware 9550sx 
(only card on the bus) -- and a firmware upgrade to the controller 
eventually fixed the problem.

but yeah, i've been meaning to add a "smartctl -a" once every 10 seconds 
to my burn-in process because of these experiences... but haven't built a 
new server in a while.

the particular box i was testing sata_mv on (tyan s2881) has every pci-x 
slot filled with one thing or another, but i only have one sata_mv device.  
if i get around to testing again i'll throw smartctl into the mix.

-dean
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