Le 18 mai 2013 à 06:49, kpn...@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, "b...@todoo.biz" <b...@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 _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
