From owner-freebsd-fs@freebsd.org  Wed Mar 29 09:15:24 2017
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From: Maurizio Vairani <maurizio.vairani@cloverinformatica.it>
Subject: ZFS. No error message when copying a 100 GiB file on a 22 GiB pool
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Date: Wed, 29 Mar 2017 11:06:40 +0200
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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


Regards,

Maurizio