From: Stan Hoeppner <stan@hardwarefreak.com>
To: xfs@oss.sgi.com
Subject: Re: XFS internal error (memory corruption)
Date: Wed, 06 Jul 2011 17:04:42 -0500 [thread overview]
Message-ID: <4E14DBFA.3040302@hardwarefreak.com> (raw)
In-Reply-To: <20110706080505.GA2354@infradead.org>
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.
--
Stan
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next prev parent reply other threads:[~2011-07-06 22:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-05 6:03 XFS internal error (memory corruption) Török Edwin
2011-07-05 13:09 ` Dave Chinner
2011-07-05 13:38 ` Török Edwin
2011-07-06 4:04 ` Dave Chinner
2011-07-06 7:07 ` Christoph Hellwig
2011-07-06 7:22 ` Dave Chinner
2011-07-06 8:05 ` Christoph Hellwig
2011-07-06 22:04 ` Stan Hoeppner [this message]
2011-07-06 19:30 ` Stan Hoeppner
2011-07-06 23:52 ` Dave Chinner
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