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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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>>
> Thank you for your explanation.
from what i tested 1MB is optimal on modern drives, 2MB doesn't speed up 
much (if any) but increases latency.

use lower values for old drives (<20GB) and low memory (<=64MB) machines