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Subject: Re: ZFS. No error message when copying a 100 GiB file on a 22 GiB pool
To: Maurizio Vairani <maurizio.vairani@cloverinformatica.it>,
 freebsd-fs@FreeBSD.org
References: <6d1f7b87-9cc8-35ca-eb5e-3d448b307461@cloverinformatica.it>
From: Andriy Gapon <avg@FreeBSD.org>
Message-ID: <334a8e6b-440a-7b9f-7aad-b17a119c50e7@FreeBSD.org>
Date: Wed, 29 Mar 2017 15:21:22 +0300
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On 29/03/2017 12:06, Maurizio Vairani wrote:
> The PC is running:
> 
> # uname -a
> 
> FreeBSD clover-nas2 11.0-RELEASE-p8 FreeBSD 11.0-RELEASE-p8 #0: Wed Feb 22
> 06:12:04 UTC 2017
> root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
> 
> 
> I need to copy a 100 GiB file, Win7.img, to another machine. The idea is to use
> a fast USB 3 SSD. The pool on it, zdata, was created with the command:
> 
> # zpool create -m /zdata -O compression=lz4 -O atime=off zdata
> diskid/DISK-00000000000000000000
> 
> 
> # zpool list zdata
> 
> NAMESIZE  ALLOC   FREE  EXPANDSZ   FRAGCAP  DEDUP  HEALTH  ALTROOT
> 
> zdata  22.2G  4.85M  22.2G -16% 0%  1.00x  ONLINE  -
> 
> 
> # du -hA Win7.img
> 
> 100GWin7.img
> 
> # du -h Win7.img
> 
> 55GWin7.img
> 
> 
> # /bin/cp Win7.img /zdata/
> 
> No error message is printed. The file on zdata is truncated:
> 
> 
> # du -Ah  /zdata/Win7.img
> 
> 46G/zdata/Win7.img
> 
> # du -h  /zdata/Win7.img
> 
> 22G/zdata/Win7.img

Does stat(1) also report a different size?
Does md5 also report different content?


-- 
Andriy Gapon