Date: Thu, 14 Nov 2013 18:35:43 +0000 From: "Teske, Devin" <Devin.Teske@fisglobal.com> To: Marcus Reid <marcus@blazingdot.com> Cc: freebsd-fs <freebsd-fs@freebsd.org>, Devin Teske <dteske@freebsd.org>, "Teske, Devin" <Devin.Teske@fisglobal.com>, Allan Jude <freebsd@allanjude.com> Subject: Re: Defaults in 10.0 ZFS through bsdinstall Message-ID: <3D3332FA-0ABF-4573-8E65-4E7FBB37100B@fisglobal.com> In-Reply-To: <5285148E.6020903@allanjude.com> References: <20131114173423.GA21761@blazingdot.com> <59A9B68B-4134-4217-83F3-B99759174EFE@fisglobal.com> <5285148E.6020903@allanjude.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On Nov 14, 2013, at 10:21 AM, Allan Jude wrote: On 2013-11-14 9:34, Reid, Marcus wrote: Hi, I noticed a couple of things with the ZFS defaults that result from using the new installer in 10.0-BETA3. One, atime is turned off everywhere by default. There was a thread on this list on June 8 with a subject of 'Changing the default for ZFS atime to off?', and from what I can tell the idea of turning off atime by default was not a popular one. Two, and probably less controversial, is that fletcher4 is specified exlicitly on the root pool, even though it is default (wouldn't you just want to go with the default, in case it changes?) Marcus I have never heard a good argument for having atime on. The performance penalty on ZFS is quite large, and it also makes your snapshots grow constant. If you have a use for it, you can turn it on I guess. This would be solved by having the dataset editor we're planning for 10.1 Seems easy enough to turn on once installed. And like Allan says, the editor for 10.1 would allow changing of the default. I'll add that if scripting it, you can (in current state for 10.0) change the dataset options at-will. The fletcher4 thing is a leftover, from older versions of ZFS where the default was fletcher2, I suppose we can remove it Let me put something together. - -- Devin -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQEcBAEBCgAGBQJShRf/AAoJEKrMn5R9npq5TYwH/j8RMceM4STpCAoMTAz8zkKn gpftMrdf37TnAPHxsXJaiZejlp+D85/a9lglYbB7e4WdgoDX9ZXA0QLtCEmEtN4y jz7KNa5oABq1GjDtwm2xQISDIe8yYI+znLSaHA9W18kCUZzi8AOj70C+O5gyY28c c3N3j6Y4EZP2wtQnWSgxvCwIX5p86Jvr3QvhrRuuMnKMCTAhzwIx24qcnA4EcTzn p9w25CKLtOzF23n3McodaUmibbBCHOYyraLQJ+eJGDXcsPBipls3oiWyiYuqpcQr 18QpLN1lS35RnULcb5pxnP9Oy9rAwxHKves9Mfu0UoWw3qTjSAf8gsGyu6QaMgc= =GjYk -----END PGP SIGNATURE----- _____________ The information contained in this message is proprietary and/or confidential. If you are not the intended recipient, please: (i) delete the message and all copies; (ii) do not disclose, distribute or use the message in any manner; and (iii) notify the sender immediately. In addition, please be aware that any message addressed to our domain is subject to archiving and review by persons other than the intended recipient. Thank you.
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