Date: Fri, 03 May 2013 11:44:08 -0700 From: Mike Carlson <mike@bayphoto.com> To: Jeremy Chadwick <jdc@koitsu.org> Cc: freebsd-fs@freebsd.org Subject: Re: zfs issue - disappearing data Message-ID: <51840578.10103@bayphoto.com> In-Reply-To: <20130503183602.GA46512@icarus.home.lan> References: <5183F739.2040908@bayphoto.com> <20130503183602.GA46512@icarus.home.lan>
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On 5/3/2013 11:36 AM, Jeremy Chadwick wrote:
> 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=3Dlzjb 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 b=
e
> clear: it is not a FreeBSD-specific thing.
>
> You may also find the -A flag to du(1) useful.
>
Hey Jeremy, thanks for the reply!
I thought of that, and the discrepency is too much.
du -Ah :
# du -Ah
16k ./XML_PRINTABLE/MC0012404
1.5k ./XML_PRINTABLE/7172142/thumbnails
14k ./XML_PRINTABLE/7172142
13k ./XML_PRINTABLE/MC0012410
11k ./XML_PRINTABLE/MC0012403
13k ./XML_PRINTABLE/MC0012409
2.5k ./XML_PRINTABLE/7172141/thumbnails
15k ./XML_PRINTABLE/7172141
20k ./XML_PRINTABLE/MC0012407
12k ./XML_PRINTABLE/MC0012408
512B ./XML_PRINTABLE/7172144/thumbnails
6.5k ./XML_PRINTABLE/7172144
4.0k ./XML_PRINTABLE/INK0000281/thumbnails
17k ./XML_PRINTABLE/INK0000281
512B ./XML_PRINTABLE/7172143/thumbnails
74k ./XML_PRINTABLE/7172143
12k ./XML_PRINTABLE/MC0012405
13k ./XML_PRINTABLE/MC0012406
239k ./XML_PRINTABLE
512B ./XML_CMD
512B ./XML_REPORTS
512B ./XML_ORDERS_TEST
512B ./XML_ORDERS/MC0012405
512B ./XML_ORDERS/MC0012408
512B ./XML_ORDERS/MC0012402
512B ./XML_ORDERS/MC0012406
512B ./XML_ORDERS/MC0012410
512B ./XML_ORDERS/MC0012403
512B ./XML_ORDERS/MC0012409
512B ./XML_ORDERS/MC0012404
272k ./XML_ORDERS/7172141
512B ./XML_ORDERS/MC0012407
454k ./XML_ORDERS/7172142
134M ./XML_ORDERS
512B ./XML_INCOMING
512B ./XML_PRINTABLE_TEST
5.0k ./XML_JOBS/7172142/Preview
6.0k ./XML_JOBS/7172142
26k ./XML_JOBS/INK0000281/Preview
27k ./XML_JOBS/INK0000281
40k ./XML_JOBS/MC0012410/Preview
41k ./XML_JOBS/MC0012410
39k ./XML_JOBS/MC0012409/Preview
40k ./XML_JOBS/MC0012409
116k ./XML_JOBS
135M .
# zfs get compressratio data/XML_WORKFLOW
NAME PROPERTY VALUE SOURCE
data/XML_WORKFLOW compressratio 1.04x -
If I didn't know better, and had not already tried to unmount/mount the=20
zvol in question, I would swear this looked liked something mounting=20
over the missing directories, similar to what can happen with a nfs=20
mount that "disappears" on a client when there is a local directory of=20
the same name.
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