Date: Sat, 18 May 2013 07:32:35 +0200 From: "bsd@todoo.biz" <bsd@todoo.biz> To: Liste FreeBSD <freebsd-questions@freebsd.org> Subject: Re: ZFS install on a partition Message-ID: <511AEFEF-7CE6-4E48-916C-81FAF8F9DEED@todoo.biz> In-Reply-To: <20130518044900.GA30652@neutralgood.org> References: <F744BBF1-D98C-47BF-9546-14D1A9CB3733@todoo.biz> <5FB78660-EDA4-40DB-8A0D-B0DE23A0FB6C@kraus-haus.org> <20130518044900.GA30652@neutralgood.org>
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Le 18 mai 2013 =E0 06:49, kpneal@pobox.com a =E9crit : > On Fri, May 17, 2013 at 08:03:30PM -0400, Paul Kraus wrote: >> On May 17, 2013, at 6:24 PM, "bsd@todoo.biz" <bsd@todoo.biz> wrote: >>> 3. Should I avoid using ZFS since my system is not well tuned and It = would be asking for trouble to use ZFS in these conditions.=20 >>=20 >> No. One of the biggest benefits of ZFS is the end to end data = integrity. >> IF there is a silent fault in the HW RAID (it happens), ZFS will = detect >> the corrupt data and note it. If you had a mirror or other redundant = device, >> ZFS would then read the data from the *other* copy and rewrite the = bad >> block (or mark that physical block bad and use another). >=20 > I believe the "copies=3D2" and "copies=3D3" option exists to enable = ZFS to > self heal despite ZFS not being in charge of RAID. If ZFS only has a = single > LUN to work with, but the copies=3D2 or more option is set, then if = ZFS > detects an error it can still correct it. >=20 > This option is a dataset option, is inheritable by child datasets, and = can > be changed at any time affecting data written after the change. To get = the > full benefit you'll therefore want to set the option before putting = data > into the relevant dataset. Ok, good to know. I planned to setup a consistent Snapshot policy and remote backup using = zfs send / receive=20 That should be enough for me=85=20 Is the overhead of this setup equal to double size used on disk ?=20 >=20 > --=20 > Kevin P. Neal = http://www.pobox.com/~kpn/ >=20 > "Nonbelievers found it difficult to defend their position in \=20 > the presense of a working computer." -- a DEC Jensen paper ________________________________________________ =AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?= =BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7 =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF= =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF BSD - BSD - BSD - BSD - BSD - BSD - BSD - BSD - ________________________________________________ =AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?= =BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7 =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF= =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF PGP ID --> 0x1BA3C2FD
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