From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ric Wheeler Subject: Re: Is >16TB support considered stable? Date: Tue, 01 Jun 2010 10:18:42 -0400 Message-ID: <4C0516C2.8070007@gmail.com> References: <4BFFF4D2.6020908@van-ness.com> <4C001BEC.9080906@redhat.com> <4C00804D.7010000@van-ness.com> <87ljb3gwee.fsf@willster.local.flamingspork.com> <4C017BAC.2000000@van-ness.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-ext4@vger.kernel.org To: Sandon Van Ness Return-path: Received: from mail-vw0-f46.google.com ([209.85.212.46]:63954 "EHLO mail-vw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753328Ab0FAOTC (ORCPT ); Tue, 1 Jun 2010 10:19:02 -0400 Received: by vws11 with SMTP id 11so1077146vws.19 for ; Tue, 01 Jun 2010 07:19:01 -0700 (PDT) In-Reply-To: <4C017BAC.2000000@van-ness.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: 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 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