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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Valentin Bud <valentin.bud@gmail.com>
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Cc: questions@freebsd.org, Marcel Grandemange <thavinci@thavinci.za.net>,
	Tsu-Fan Cheng <tfcheng@gmail.com>
Subject: Re: ZFS Recovery Tools
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> What does MAXPHYS mean (yes max raw I/O transfer) and do? A little
> bit more specific if you may.

how large can be single read from disk.

when you say read 2 files in the same time, FreeBSD will readahead at most 
MAXPHYS from one file, then from file 2, from file 1 etc.

128kB/s is way too much for todays drives, that can read 1MB within one 
access time.