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Re: Practical file system size question

To: Joe Landman <joe.landman@xxxxxxxxx>
Subject: Re: Practical file system size question
From: Robert Bennett <rbennett@xxxxxxxxxxxxxxxxx>
Date: Wed, 17 Apr 2013 10:28:06 -0400
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <516EA959.6090205@xxxxxxxxx>
References: <CAFcHYYBBfsoxdaxNaRjnfyG3yVrRJYYfuoA5vNurdmu+1AUCyA@xxxxxxxxxxxxxx> <516EA959.6090205@xxxxxxxxx>
Thanks for the quick replies.  It's very nice.

We are using LSI MegaRAID 9280-8E cards.  I got bit by the LSI firmware bug a while back and chased what appeared to be a memory issue before discovering that a firmware upgrade solved all my problems.  I don't remember how many grey hairs were a result of that exercise, but it wasn't just a few.

We build our own storage from Super Micro Components.

Why not look at 4TB drives?  Short sightedness.  Fear.  Baby Steps.  Take your pick.  With that being said - I will look into it.

Thanks for all the insights.


Bob Bennett
Director of IT
Crawford Media Services, Inc.
d: 678.536.4906 e: rbennett@xxxxxxxxxxxxxxxxx | w: www.crawford.com

6 West Druid Hills Drive, NE

Atlanta, GA 30329

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On Wed, Apr 17, 2013 at 9:53 AM, Joe Landman <joe.landman@xxxxxxxxx> wrote:
On 04/17/2013 09:18 AM, Robert Bennett wrote:


The question is - does anyone have experience with this type of
configuration and in particular with 3TB HDDs and a file system size of
99TB?  The rebuild time with 2TB drives is ~ 24 hours.  Should I expect

Yes, we've built up to 240TB raw (180TB usable) xfs systems for our customers on our units.  Very doable, though there are some considerations.

First off, why 3TB when 4TB are in market, pretty stable ... ?  Unless there is a budgetary limitation you are working against, I'd advise at least looking at those.

Second, which LSI controllers are you using?  Firmware updates for the controllers to use 3TB and higher drives are pretty much mandated.  Our experience with various LSI cards has ranged from not so good to pretty good, and this is a firmware version revision dependent (along with driver) issue from what we found.

the rebuild time for the 3TB drives to be ~ 36 hours?

Not in our experience.  Typically 5-10 hours depending upon RAID card used, RAID configuration, drives chosen, and other issues.  Its pretty complex, and hard to predict in advance without trying it.

Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics, Inc.
email: landman@scalableinformatics.com
web  : http://scalableinformatics.com
phone: +1 734 786 8423 x121
fax  : +1 866 888 3112
cell : +1 734 612 4615

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