linux-ext4 - Re: Is >16TB support considered stable?

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Message-ID: <4C0516C2.8070007@gmail.com>
Date:	Tue, 01 Jun 2010 10:18:42 -0400
From:	Ric Wheeler <ricwheeler@...il.com>
To:	Sandon Van Ness <sandon@...-ness.com>
CC:	linux-ext4@...r.kernel.org
Subject: Re: Is >16TB support considered stable?

On 05/29/2010 04:40 PM, Sandon Van Ness wrote:
> On 05/28/2010 09:32 PM, Stewart Smith wrote:
>    
>> On Fri, 28 May 2010 19:47:41 -0700, Sandon Van Ness<sandon@...-ness.com>  wrote:
>>
>>      
>>> able to allocate blocks or memory (it was a while back so I forget). I
>>> spent 24 hours defraging it getting the fragmentation down from like
>>> 99.9995% to 99.2% and the problem went away. XFS seems to excessively
>>> fragment (that horribly fragmented system was running mythtv and after
>>> switching to JFS I see way less fragmented files).
>>>
>>>        
>> MythTV's IO path is well... hacked to get around all of ext3's quirks.
>>
>> You can:
>> - mount XFS with allocsize=64m (or similar)
>> - possibly use the XFS filestreams allocator
>> - comment out the fsync() in the mythtv tree
>> - LD_PRELOAD libeatmydata for myth.
>>
>> it turns out that writing a rather small amount of data and fsync()ing
>> (and repeating 1,000,000 times) makes the allocator cry a bit with
>> default settings. Especially if you were recording a few things at once.
>>
>>      
> Well JFS has absolutely no problems with files created via mythtv. I
> also am not going to be using mythtv on this system at all and I was
> just giving some examples of my past experience with XFS and why I will
> never use it. Anyway please no more XFS discussion or suggestions for
> other file-systems I was mainly curious on what the stability or peoples
> experiences are with ext4 and 64-bit addressing. I have long since
> decided I will never run XFS again as I can't ever trust it with my data
> again. I mainly wrote this list to try to find out what the opinions
> were on ext4 with>16 TiB file-systems.
>
>    

The short answer is no.

Ric

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