Date: Fri, 3 May 2013 11:36:02 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: Mike Carlson <mike@bayphoto.com> Cc: freebsd-fs@freebsd.org Subject: Re: zfs issue - disappearing data Message-ID: <20130503183602.GA46512@icarus.home.lan> In-Reply-To: <5183F739.2040908@bayphoto.com> References: <5183F739.2040908@bayphoto.com>
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On Fri, May 03, 2013 at 10:43:21AM -0700, Mike Carlson wrote:
> {snipping parts I have no knowledge of}
>
> History for 'data':
> {snip}
> 2013-02-25.17:12:22 zfs set compression=lzjb data
>
> We had a file structure drop off:
>
> /data/XML_WORKFLOW/XML_ORDERS/
>
> around 5/2/2012 @ 17:00
>
> In that directory, there were a few thousand directories (containing
> images and a couple metadata text/xml files)
>
> What is odd, is doing a du -h in the parent XML_WORKFLOW directory,
> only reports ~150MB:
>
> # find . -type f |wc -l
> 86
> # du -sh .
> 130M .
>
>
> however, df reports 1.5GB:
>
> # df -h .
> Filesystem Size Used Avail Capacity Mounted on
> data/XML_WORKFLOW 28T 1.5G 28T 0% /data/XML_WORKFLOW
This is one of the side effects of ZFS compression. Google "zfs
compression df du freebsd". You'll find lots of chat about this. To be
clear: it is not a FreeBSD-specific thing.
You may also find the -A flag to du(1) useful.
--
| Jeremy Chadwick jdc@koitsu.org |
| UNIX Systems Administrator http://jdc.koitsu.org/ |
| Mountain View, CA, US |
| Making life hard for others since 1977. PGP 4BD6C0CB |
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