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 à 06:49, kpneal@pobox.com a écrit : > 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. >> >> 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). > > I believe the "copies=2" and "copies=3" 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=2 or more option is set, then if ZFS > detects an error it can still correct it. > > 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 That should be enough for me… Is the overhead of this setup equal to double size used on disk ? > > -- > Kevin P. Neal http://www.pobox.com/~kpn/ > > "Nonbelievers found it difficult to defend their position in \ > the presense of a working computer." -- a DEC Jensen paper ________________________________________________ «?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ BSD - BSD - BSD - BSD - BSD - BSD - BSD - BSD - ________________________________________________ «?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ PGP ID --> 0x1BA3C2FD
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