linux-ext4 - Re: ext4: (2.6.34-rc4): This should not happen!! Data will be lost

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Message-ID: <20100420183533.GA21495@skl-net.de>
Date:	Tue, 20 Apr 2010 20:35:33 +0200
From:	Andre Noll <maan@...temlinux.org>
To:	Bernd Schubert <bernd.schubert@...tmail.fm>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Linux Driver <Linux-Driver@...gic.com>,
	Thomas Helle <Helle@...bingen.mpg.de>
Subject: Re: ext4: (2.6.34-rc4): This should not happen!!  Data will be lost

On 19:26, Bernd Schubert wrote:
> On Tuesday 20 April 2010, Eric Sandeen wrote:
> I think interesting at this point would be the exact model of the Infortrend 
> device.

Here's the system information as reported by the telnet interface:

	CPU Type             PPC750FX        
	Total Cache Size     2048MB DDR(ECC) 
	Firmware Version     3.42I.03        
	Bootrecord Version   1.23A           
	FW Upgradability     Rev. C          
	Serial Number        6912121         
	Battery Backup Unit  Present         
	Base Board Rev. ID   0               
	Base Board ID        81              
	ID of NVRAM Defaults A16F-G2221 V6.10
	Controller Position  Slot A          

> There are some completely broken models (IMHO), which have two 
> controllers for redundancy.

This is a 4 year old system (which does not support Raid6). It has only
a single controller though.

> Now with enabled write-back cache, it can happen that those units run
> into some kind of firmware bug. It then takes about 2h to flush 2GB of
> write-back cache.  The telnet interface will show the status of the
> cache.

Hey, I saw this once on a different (newer) infortrend system. However,
it might still be hapening on this system as well and cause the timeout
problems.

Guess I'll have to check if there's a more recent firmware for this
system..

Thanks
Andre
-- 
The only person who always got his work done by Friday was Robinson Crusoe

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