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Date:      Fri, 12 Feb 2016 10:30:44 -0500
From:      "Thomas Laus" <lausts@acm.org>
To:        freebsd-stable@freebsd.org
Subject:   Is UEFI required for ZFS?
Message-ID:  <56BDFAA4.17139.1EEE35@lausts.acm.org>

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I have a new Asus H170-Plus-D3 motherboard that will be used for a DOM0 Xen 
Server.  It uses an Intel i5-6300 processor and a Samsung 840 EVO SSD.  I 
would like to use ZFS on this new installation.  The Xen Kernel does not have 
UEFI support at this time, so I installed FreeBSD CURRENT r295345 in 'legacy 
mode'.  It takes about 7 minutes to go from the first '|' character to 
getting the 'beastie' menu.  I changed the BIOS to UEFI and did another 
installation.  The boot process goes in an instant.  Thinking that it may be 
an issue with FreeBSD CURRENT, I installed FreeBSD 10.3 BETA 1 in both legacy 
and UEFI mode.  The results were the same.  BIOS Legacy mode with a default 
ZFS installation takes nearly 7 minutes to get the Beastie menu.  An UEFI 
installation with ZFS is instantanious.  A default GPT installation of both 
CURRENT and FreeBSD 10.3 BETA1, either legacy or UEFI, also gives an instant 
bootup.

How can I dig deeper into my problem?  I would like to use ZFS with my Xen 
Server.

Tom

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