Date: Tue, 17 Nov 2015 09:08:12 +0100 From: "Patrick M. Hausen" <hausen@punkt.de> To: Freddie Cash <fjwcash@gmail.com> Cc: freebsd-stable <freebsd-stable@freebsd.org>, freebsd-scsi@freebsd.org Subject: ZFS on labelled partitions (was: Re: LSI SAS2008 mps driver preferred firmware version) Message-ID: <878D84A9-4553-413B-ACA4-5ABF499F28C1@punkt.de> In-Reply-To: <CAOjFWZ49A8b6g=mQL3jzJaNX-Lf%2BuDCvmscyB6F4tr7Ax=HMbg@mail.gmail.com> References: <5644FF09.9090200@free.de> <CA%2BE3k93QrUFA3BvhoswkVDXh2bR2aLYG6Z0TOrisVvNL=%2BMZVA@mail.gmail.com> <56472686.5030301@free.de> <20151114143104.GA41119@in-addr.com> <7710CBCC-E68F-4454-9E29-E50ED1C6B511@sarenet.es> <CAN6yY1sH0PnnF_AGwDsA75i_Z6ptOr4J0c_Gqrt%2BRFO6eZsW-Q@mail.gmail.com> <CAOjFWZ4Js65gQZc6rbT9SKg-jZozziTa=JGpJys6HyejdgWP%2Bg@mail.gmail.com> <20151116205734.GM48728@zxy.spb.ru> <CAOjFWZ49A8b6g=mQL3jzJaNX-Lf%2BuDCvmscyB6F4tr7Ax=HMbg@mail.gmail.com>
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--Apple-Mail=_1B2B703B-9A6A-4088-B7E0-8CC3E339EA61 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi, all, > Am 16.11.2015 um 22:19 schrieb Freddie Cash <fjwcash@gmail.com>: >=20 > =E2=80=8BYou label the disks as they are added to the system the first = time. That > way, you always know where each disk is located, and you only deal = with the > labels. we do the same for obvious reasons. But I always wonder about the = possible downsides, because ZFS documentation explicitly states: ZFS operates on raw devices, so it is possible to create a = storage pool comprised of logical volumes, either software or hardware. This configuration is not = recommended, as ZFS works best when it uses raw physical devices. Using logical volumes = might sacrifice performance, reliability, or both, and should be avoided. (from http://docs.oracle.com/cd/E19253-01/819-5461/gbcik/index.html) Can anyone shed some lght on why not using raw devices might sacrifice performance or reliability? Or is this just outdated folklore? Thanks, Patrick -- punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe Tel. 0721 9109 0 * Fax 0721 9109 100 info@punkt.de http://www.punkt.de Gf: J=C3=BCrgen Egeling AG Mannheim 108285 --Apple-Mail=_1B2B703B-9A6A-4088-B7E0-8CC3E339EA61 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQEcBAEBCgAGBQJWSuBsAAoJEJBvLuLt2olcScMH/1VvysKjTcZqVOIltP1FyZWn LzaS3uGKVPNJKYKmL6fl0oluynUhFdupvPqLT8qI5ViMe6lpA6ay9dCZ2uhdcOhS mu2qT8orRTSNWr4DZmpuH0lxulYypEcBGN0oxwokcTuv3imVE1iMSBFnUoNWS1NT cf/jBREsixk3YFr2Az7cKG80Jcnp/T2sPrTMQV1UWvkz4qe1JEUCU5VflUhPEH56 CJpp5U1647nrlvqmsv5XZgENtA3QGN2WrhFei56C1wGRkrmqDGy81WQzQAaVsPbD t6JgaOJaFKB+m4S1T3Ar0Qf96rp6/mm+/f96fCaurzK4oBuHSuuaJPs5cHUPke4= =MTIy -----END PGP SIGNATURE----- --Apple-Mail=_1B2B703B-9A6A-4088-B7E0-8CC3E339EA61--
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