Date: Tue, 04 Mar 2014 11:52:38 +1100 From: Daniel O'Callaghan <danny@clari.net.au> To: freebsd-questions@freebsd.org Cc: Chris Stankevitz <chrisstankevitz@gmail.com> Subject: Re: ZFS, GPTIDs, and using the whole disk Message-ID: <531523D6.5010401@clari.net.au> In-Reply-To: <CAPi0psuD5zDBuBZmE3tBKDeFdMcpvBn3pU4waDu6FU8SaTs0-Q@mail.gmail.com> References: <CAPi0psuD5zDBuBZmE3tBKDeFdMcpvBn3pU4waDu6FU8SaTs0-Q@mail.gmail.com>
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On 4/03/2014 10:47 AM, Chris Stankevitz wrote: > Please identify any false statements: > 1. ZFS prefers to use the entire disk. Garrett Wollman(I think...) says this is false. FreeBSD's disk subsystem does not change the way it behaves wrt to disks versus partitions. Solaris and OpenIndiana only guarantee barrier-writes while still using write-cache if using the whole disk. This is also mentioned in https://wiki.freebsd.org/ZFSTuningGuide "The caveat about only giving ZFS full devices is a solarism that doesn't apply to FreeBSD. On Solaris write caches are disabled on drives if partitions are handed to ZFS. On FreeBSD this isn't the case." With this in mind, my personal preference is to use GPT partitions. Cheers, Danny
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