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Re: XFS internal error (memory corruption)

To: xfs@xxxxxxxxxxx
Subject: Re: XFS internal error (memory corruption)
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Wed, 06 Jul 2011 17:04:42 -0500
In-reply-to: <20110706080505.GA2354@xxxxxxxxxxxxx>
References: <4E12A927.9020102@xxxxxxxxx> <20110705130932.GF1026@dastard> <4E1313C1.6020309@xxxxxxxxx> <20110706040403.GW1026@dastard> <20110706070756.GA25800@xxxxxxxxxxxxx> <20110706072221.GZ1026@dastard> <20110706080505.GA2354@xxxxxxxxxxxxx>
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On 7/6/2011 3:05 AM, Christoph Hellwig wrote:
> On Wed, Jul 06, 2011 at 05:22:21PM +1000, Dave Chinner wrote:
>> Unless you have a good sized chunk of BBWC in front of your disks,
>> in which case internal logs are just as fast. In fact, internal logs
>> can are often faster in this case because an internal log on a 12
>> disk RAID6 array can sink a whole log more bandwidth than an external
>> log on a 2-disk RAID0 mirror.....
>> At least, that's what my hardware tells me. ;)
> Sure, a nice BBWC setup will give you good results.  But it's generally
> much more expensive than a simple setup with a raid5 or 6 and a mirror for
> the log device.

If you're talking consumer grade gear, well, sure, as there is no such
thing as a consumer hardware RAID card.  In the world of branded OEM
'enterprise' gear, you can get a BBWC RAID card solution for little more
than two drives.  Are most XFS admins running consumer or enterprise
grade gear?

LSI 9260-4i w/512MB BBWC     = $485 USD
Intel RES2SV24024P expander  = $280 USD
Total                        = $765 USD

2 HP 146GB 10kRPM SAS drives = $520 USD.

I threw in the expander as this LSI card is thoroughly limited with only
4 ports.  It's also cheaper going this route than buying the sister card
with 8 ports, yet with the same performance, and 12 more total ports.


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